Support Nuvoton NPCM Video Capture/Encode Engine

Add dt-binding document for Video Capture/Differentiation Engine (VCD) and Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.

Signed-off-by Marvin Lin <[email protected]>

---
 .../bindings/media/nuvoton,npcm-ece.yaml      | 43 +++++++++++
 .../bindings/media/nuvoton,npcm-vcd.yaml      | 72 +++++++++++++++++++
 2 files changed, 115 insertions(+)

Quoted 8 lines

Add dt-binding document for Video Capture/Differentiation Engine (VCD) and Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.

Signed-off-by Marvin Lin <[email protected]>

---
 .../bindings/media/nuvoton,npcm-ece.yaml      | 43 +++++++++++
 .../bindings/media/nuvoton,npcm-vcd.yaml      | 72 +++++++++++++++++++
 2 files changed, 115 insertions(+)

Reviewed-by Krzysztof Kozlowski <[email protected]>

Best regards,
Krzysztof

Add driver for Video Capture/Differentiation Engine (VCD) and Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs. The VCD can capture and differentiate video data from digital or analog sources, then the ECE will compress the data into HEXTILE format. This driver implements V4L2 interfaces and provides user controls to support KVM feature, also tested with VNC Viewer and openbmc/obmc-ikvm.

Signed-off-by Marvin Lin <[email protected]>

---
  MAINTAINERS                                 |   12 +
  drivers/media/platform/Kconfig              |    1 +
  drivers/media/platform/Makefile             |    1 +
  drivers/media/platform/nuvoton/Kconfig      |   15 +
  drivers/media/platform/nuvoton/Makefile     |    2 +
  drivers/media/platform/nuvoton/npcm-regs.h  |  171 ++
  drivers/media/platform/nuvoton/npcm-video.c | 1924 +++++++++++++++++++
  7 files changed, 2126 insertions(+)

create mode 100644 drivers/media/platform/nuvoton/Kconfig create mode 100644 drivers/media/platform/nuvoton/Makefile create mode 100644 drivers/media/platform/nuvoton/npcm-regs.h create mode 100644 drivers/media/platform/nuvoton/npcm-video.c

MAINTAINERS +12 -0

index 5a4526a171d6..d9f842ec141c 100644
@@ -2570,6 +2570,18 @@ F:	drivers/rtc/rtc-nct3018y.c
  F:	include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
  F:	include/dt-bindings/clock/nuvoton,npcm845-clk.h
 
+ARM/NUVOTON NPCM VIDEO ENGINE DRIVER
+M:	Joseph Liu <[email protected]>
+M:	Marvin Lin <[email protected]>
+L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/nuvoton,npcm-ece.yaml
+F:	Documentation/devicetree/bindings/media/nuvoton,npcm-vcd.yaml
+F:	Documentation/userspace-api/media/drivers/npcm-video.rst
+F:	drivers/media/platform/nuvoton/
+F:	include/uapi/linux/npcm-video.h
+
  ARM/NUVOTON WPCM450 ARCHITECTURE
  M:	Jonathan Neuschäfer <[email protected]>
  L:	[email protected] (moderated for non-subscribers)

drivers/media/platform/Kconfig +1 -0

index ee579916f874..91e54215de3a 100644
@@ -73,6 +73,7 @@ source "drivers/media/platform/intel/Kconfig"
  source "drivers/media/platform/marvell/Kconfig"
  source "drivers/media/platform/mediatek/Kconfig"
  source "drivers/media/platform/microchip/Kconfig"
+source "drivers/media/platform/nuvoton/Kconfig"
  source "drivers/media/platform/nvidia/Kconfig"
  source "drivers/media/platform/nxp/Kconfig"
  source "drivers/media/platform/qcom/Kconfig"

drivers/media/platform/Makefile +1 -0

index 5453bb868e67..3296ec1ebe16 100644
@@ -16,6 +16,7 @@ obj-y += intel/
  obj-y += marvell/
  obj-y += mediatek/
  obj-y += microchip/
+obj-y += nuvoton/
  obj-y += nvidia/
  obj-y += nxp/
  obj-y += qcom/

drivers/media/platform/nuvoton/Kconfig new file +15 -0

new file mode 100644
index 000000000000..5047d1ba3de5
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+comment "Nuvoton media platform drivers"
+
+config VIDEO_NPCM_VCD_ECE
+	tristate "Nuvoton NPCM Video Capture/Encode Engine driver"
+	depends on V4L_PLATFORM_DRIVERS
+	depends on VIDEO_DEV
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  Support for the Video Capture/Differentiation Engine (VCD) and
+	  Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.
+	  The VCD can capture and differentiate video data from digital or
+	  analog sources, then the ECE will compress the data into HEXTILE
+	  format.

drivers/media/platform/nuvoton/Makefile new file +2 -0

new file mode 100644
index 000000000000..74a4e3fc8555
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_VIDEO_NPCM_VCD_ECE) += npcm-video.o

drivers/media/platform/nuvoton/npcm-regs.h new file +171 -0

new file mode 100644
index 000000000000..f528f5726307
@@ -0,0 +1,171 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Register definition header for NPCM video driver
+ *
+ * Copyright (C) 2022 Nuvoton Technologies
+ */
+
+#ifndef _NPCM_REGS_H
+#define _NPCM_REGS_H
+
+/* VCD Registers */
+#define VCD_DIFF_TBL			0x0000
+#define VCD_FBA_ADR			0x8000
+#define VCD_FBB_ADR			0x8004
+
+#define VCD_FB_LP			0x8008
+#define  VCD_FBA_LP			GENMASK(15, 0)
+#define  VCD_FBB_LP			GENMASK(31, 16)
+
+#define VCD_CAP_RES			0x800c
+#define  VCD_CAP_RES_VERT_RES		GENMASK(10, 0)
+#define  VCD_CAP_RES_HOR_RES		GENMASK(26, 16)
+
+#define VCD_MODE			0x8014
+#define  VCD_MODE_VCDE			BIT(0)
+#define  VCD_MODE_CM565			BIT(1)
+#define  VCD_MODE_IDBC			BIT(3)
+#define  VCD_MODE_COLOR_CNVRT		GENMASK(5, 4)
+#define   VCD_MODE_COLOR_CNVRT_NO_CNVRT	0
+#define   VCD_MODE_COLOR_CNVRT_RGB_222	1
+#define   VCD_MODE_COLOR_CNVRT_666_MODE	2
+#define   VCD_MODE_COLOR_CNVRT_RGB_888	3
+#define  VCD_MODE_KVM_BW_SET		BIT(16)
+
+#define VCD_CMD				0x8018
+#define  VCD_CMD_GO			BIT(0)
+#define  VCD_CMD_RST			BIT(1)
+#define  VCD_CMD_OPERATION		GENMASK(6, 4)
+#define   VCD_CMD_OPERATION_CAPTURE	0
+#define   VCD_CMD_OPERATION_COMPARE	2
+
+#define	VCD_STAT			0x801c
+#define	 VCD_STAT_DONE			BIT(0)
+#define	 VCD_STAT_IFOT			BIT(2)
+#define	 VCD_STAT_IFOR			BIT(3)
+#define	 VCD_STAT_BUSY			BIT(30)
+#define	VCD_STAT_CLEAR			0x3fff
+
+#define VCD_INTE			0x8020
+#define  VCD_INTE_DONE_IE		BIT(0)
+#define  VCD_INTE_IFOT_IE		BIT(2)
+#define  VCD_INTE_IFOR_IE		BIT(3)
+
+#define VCD_RCHG			0x8028
+#define VCD_RCHG_TIM_PRSCL		GENMASK(12, 9)
+
+#define VCD_FIFO			0x805c
+#define  VCD_FIFO_TH			0x100350ff
+
+#define VCD_MAX_SRC_BUFFER_SIZE		0x500000 /* 1920 x 1200 x 2 bpp */
+#define VCD_KVM_BW_PCLK			120000000UL
+#define VCD_BUSY_TIMEOUT_US		300000
+
+/* ECE Registers */
+#define ECE_DDA_CTRL			0x0000
+#define  ECE_DDA_CTRL_ECEEN		BIT(0)
+#define  ECE_DDA_CTRL_INTEN		BIT(8)
+
+#define ECE_DDA_STS			0x0004
+#define  ECE_DDA_STS_CDREADY		BIT(8)
+#define  ECE_DDA_STS_ACDRDY		BIT(10)
+
+#define ECE_FBR_BA			0x0008
+#define ECE_ED_BA			0x000c
+#define ECE_RECT_XY			0x0010
+
+#define ECE_RECT_DIMEN			0x0014
+#define  ECE_RECT_DIMEN_WR		GENMASK(10, 0)
+#define  ECE_RECT_DIMEN_WLTR		GENMASK(14, 11)
+#define  ECE_RECT_DIMEN_HR		GENMASK(26, 16)
+#define  ECE_RECT_DIMEN_HLTR		GENMASK(30, 27)
+
+#define ECE_RESOL			0x001c
+#define  ECE_RESOL_FB_LP_512		0
+#define  ECE_RESOL_FB_LP_1024		1
+#define  ECE_RESOL_FB_LP_2048		2
+#define  ECE_RESOL_FB_LP_2560		3
+#define  ECE_RESOL_FB_LP_4096		4
+
+#define ECE_HEX_CTRL			0x0040
+#define  ECE_HEX_CTRL_ENCDIS		BIT(0)
+#define  ECE_HEX_CTRL_ENC_GAP		GENMASK(12, 8)
+
+#define ECE_HEX_RECT_OFFSET		0x0048
+#define  ECE_HEX_RECT_OFFSET_MASK	GENMASK(22, 0)
+
+#define ECE_TILE_W			16
+#define ECE_TILE_H			16
+#define ECE_POLL_TIMEOUT_US		300000
+
+/* GCR Registers */
+#define INTCR				0x3c
+#define  INTCR_GFXIFDIS			GENMASK(9, 8)
+#define  INTCR_DEHS			BIT(27)
+
+#define INTCR2				0x60
+#define  INTCR2_GIRST2			BIT(2)
+#define  INTCR2_GIHCRST			BIT(5)
+#define  INTCR2_GIVCRST			BIT(6)
+
+#define INTCR3				0x9c
+#define  INTCR3_GMMAP			GENMASK(10, 8)
+#define   INTCR3_GMMAP_128MB		0
+#define   INTCR3_GMMAP_256MB		1
+#define   INTCR3_GMMAP_512MB		2
+#define   INTCR3_GMMAP_1GB		3
+#define   INTCR3_GMMAP_2GB		4
+
+#define INTCR4				0xc0
+#define  INTCR4_GMMAP			GENMASK(22, 16)
+#define  INTCR4_GMMAP_512MB		0x1f
+#define  INTCR4_GMMAP_512MB_ECC		0x1b
+#define  INTCR4_GMMAP_1GB		0x3f
+#define  INTCR4_GMMAP_1GB_ECC		0x37
+#define  INTCR4_GMMAP_2GB		0x7f
+#define  INTCR4_GMMAP_2GB_ECC		0x6f
+
+#define ADDR_GMMAP_128MB		0x07000000
+#define ADDR_GMMAP_256MB		0x0f000000
+#define ADDR_GMMAP_512MB		0x1f000000
+#define ADDR_GMMAP_512MB_ECC		0x1b000000
+#define ADDR_GMMAP_1GB			0x3f000000
+#define ADDR_GMMAP_1GB_ECC		0x37000000
+#define ADDR_GMMAP_2GB			0x7f000000
+#define ADDR_GMMAP_2GB_ECC		0x6f000000
+
+#define GMMAP_LENGTH			0xc00000 /* 4MB preserved, total 16MB */
+
+#define MFSEL1				0x0c
+#define  MFSEL1_DVH1SEL			BIT(27)
+
+/* GFXI Register */
+#define DISPST				0x00
+#define  DISPST_HSCROFF			BIT(1)
+#define  DISPST_MGAMODE			BIT(7)
+
+#define HVCNTL				0x10
+#define  HVCNTL_MASK			GENMASK(7, 0)
+
+#define HVCNTH				0x14
+#define  HVCNTH_MASK			GENMASK(2, 0)
+
+#define VVCNTL				0x20
+#define  VVCNTL_MASK			GENMASK(7, 0)
+
+#define VVCNTH				0x24
+#define  VVCNTH_MASK			GENMASK(2, 0)
+
+#define GPLLINDIV			0x40
+#define  GPLLINDIV_MASK			GENMASK(5, 0)
+#define  GPLLINDIV_GPLLFBDV8		BIT(7)
+
+#define GPLLFBDIV			0x44
+#define  GPLLFBDIV_MASK			GENMASK(7, 0)
+
+#define GPLLST				0x48
+#define  GPLLST_PLLOTDIV1		GENMASK(2, 0)
+#define  GPLLST_PLLOTDIV2		GENMASK(5, 3)
+#define  GPLLST_GPLLFBDV109		GENMASK(7, 6)
+
+#endif /* _NPCM_REGS_H */

drivers/media/platform/nuvoton/npcm-video.c new file +272 -0

new file mode 100644
index 000000000000..951fdb4e37ca
@@ -0,0 +1,1924 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Video Capture/Differentiation Engine (VCD) and Encoding
+ * Compression Engine (ECE) present on Nuvoton NPCM SoCs.
+ *
+ * Copyright (C) 2022 Nuvoton Technologies
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/v4l2-controls.h>
+#include <linux/videodev2.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+#include <uapi/linux/npcm-video.h>
+#include "npcm-regs.h"
+
+#define DEVICE_NAME			"npcm-video"
+#define MAX_FRAME_RATE			60
+#define MAX_WIDTH			1920
+#define MAX_HEIGHT			1200
+#define MIN_WIDTH			320
+#define MIN_HEIGHT			240
+#define MIN_LP				512
+#define MAX_LP				4096
+#define RECT_W				16
+#define RECT_H				16
+#define BITMAP_SIZE			32
+
+struct npcm_video_addr {
+	size_t size;
+	dma_addr_t dma;
+	void *virt;
+};
+
+struct npcm_video_buffer {
+	struct vb2_v4l2_buffer vb;
+	struct list_head link;
+};
+
+#define to_npcm_video_buffer(x) \
+	container_of((x), struct npcm_video_buffer, vb)
+
+enum {
+	VIDEO_STREAMING,
+	VIDEO_FRAME_INPRG,
+	VIDEO_STOPPED,
+};
+
+struct rect_list {
+	struct v4l2_clip clip;
+	struct list_head list;
+};
+
+struct rect_list_info {
+	struct rect_list *list;
+	struct rect_list *first;
+	struct list_head *head;
+	unsigned int index;
+	unsigned int tile_perline;
+	unsigned int tile_perrow;
+	unsigned int offset_perline;
+	unsigned int tile_size;
+	unsigned int tile_cnt;
+};
+
+struct npcm_ece {
+	struct regmap *regmap;
+	atomic_t clients;
+	struct reset_control *reset;
+};
+
+struct npcm_video {
+	struct regmap *gcr_regmap;
+	struct regmap *gfx_regmap;
+	struct regmap *vcd_regmap;
+
+	struct device *dev;
+	struct v4l2_ctrl_handler ctrl_handler;
+	struct v4l2_device v4l2_dev;
+	struct v4l2_pix_format pix_fmt;
+	struct v4l2_bt_timings active_timings;
+	struct v4l2_bt_timings detected_timings;
+	u32 v4l2_input_status;
+	struct vb2_queue queue;
+	struct video_device vdev;
+	struct mutex video_lock; /* v4l2 and videobuf2 lock */
+
+	struct list_head buffers;
+	spinlock_t lock; /* buffer list lock */
+	unsigned long flags;
+	unsigned int sequence;
+
+	size_t max_buffer_size;
+	struct npcm_video_addr src;
+	struct reset_control *reset;
+	struct npcm_ece ece;
+
+	unsigned int frame_rate;
+	unsigned int vb_index;
+	u32 bytesperline;
+	u8 bytesperpixel;
+	u32 rect_cnt;
+	u8 num_buffers;
+	struct list_head *list;
+	u32 *rect;
+	int ctrl_cmd;
+	int op_cmd;
+};
+
+#define to_npcm_video(x) container_of((x), struct npcm_video, v4l2_dev)
+
+static const struct v4l2_dv_timings_cap npcm_video_timings_cap = {
+	.type = V4L2_DV_BT_656_1120,
+	.bt = {
+		.min_width = MIN_WIDTH,
+		.max_width = MAX_WIDTH,
+		.min_height = MIN_HEIGHT,
+		.max_height = MAX_HEIGHT,
+		.min_pixelclock = 6574080, /* 640 x 480 x 24Hz */
+		.max_pixelclock = 138240000, /* 1920 x 1200 x 60Hz */
+		.standards = V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
+			     V4L2_DV_BT_STD_CVT | V4L2_DV_BT_STD_GTF,
+		.capabilities = V4L2_DV_BT_CAP_PROGRESSIVE |
+				V4L2_DV_BT_CAP_REDUCED_BLANKING |
+				V4L2_DV_BT_CAP_CUSTOM,
+	},
+};
+
+static DECLARE_BITMAP(bitmap, BITMAP_SIZE);
+
+static void npcm_video_ece_prepend_rect_header(u8 *addr, u16 x, u16 y, u16 w,
+					       u16 h)
+{
+	__be16 x_pos = cpu_to_be16(x);
+	__be16 y_pos = cpu_to_be16(y);
+	__be16 width = cpu_to_be16(w);
+	__be16 height = cpu_to_be16(h);
+	__be32 encoding = cpu_to_be32(5); /* Hextile encoding */
+
+	memcpy(addr, &x_pos, 2);
+	memcpy(addr + 2, &y_pos, 2);
+	memcpy(addr + 4, &width, 2);
+	memcpy(addr + 6, &height, 2);
+	memcpy(addr + 8, &encoding, 4);
+}
+
+static unsigned int npcm_video_ece_get_ed_size(struct npcm_video *video,
+					       u32 offset, u8 *addr)
+{
+	struct regmap *ece = video->ece.regmap;
+	u32 size, gap, val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(ece, ECE_DDA_STS, val,
+				       (val & ECE_DDA_STS_CDREADY),
+				       0, ECE_POLL_TIMEOUT_US);
+
+	if (ret) {
+		dev_warn(video->dev, "Wait for ECE_DDA_STS_CDREADY timeout\n");
+		return 0;
+	}
+
+	size = readl(addr + offset);
+
+	regmap_read(ece, ECE_HEX_CTRL, &val);
+	gap = FIELD_GET(ECE_HEX_CTRL_ENC_GAP, val);
+
+	dev_dbg(video->dev, "offset = %u, ed_size = %u, gap = %u\n", offset,
+		size, gap);
+
+	return size + gap;
+}
+
+static void npcm_video_ece_enc_rect(struct npcm_video *video, u32 r_off_x,
+				    u32 r_off_y, u32 r_w, u32 r_h)
+{
+	struct regmap *ece = video->ece.regmap;
+	u32 rect_offset = (r_off_y * video->bytesperline) + (r_off_x * 2);
+	u32 temp;
+	u32 w_tile;
+	u32 h_tile;
+	u32 w_size = ECE_TILE_W;
+	u32 h_size = ECE_TILE_H;
+
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN,
+			   ECE_DDA_CTRL_ECEEN);
+	regmap_write(ece, ECE_DDA_STS, ECE_DDA_STS_CDREADY |
+		     ECE_DDA_STS_ACDRDY);
+	regmap_write(ece, ECE_RECT_XY, rect_offset);
+
+	w_tile = r_w / ECE_TILE_W;
+	h_tile = r_h / ECE_TILE_H;
+
+	if (r_w % ECE_TILE_W) {
+		w_tile += 1;
+		w_size = r_w % ECE_TILE_W;
+	}
+
+	if (r_h % ECE_TILE_H || !h_tile) {
+		h_tile += 1;
+		h_size = r_h % ECE_TILE_H;
+	}
+
+	temp = FIELD_PREP(ECE_RECT_DIMEN_WLTR, w_size - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_HLTR, h_size - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_WR, w_tile - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_HR, h_tile - 1);
+
+	regmap_write(ece, ECE_RECT_DIMEN, temp);
+}
+
+static u32 npcm_video_ece_read_rect_offset(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+	u32 offset;
+
+	regmap_read(ece, ECE_HEX_RECT_OFFSET, &offset);
+	return FIELD_GET(ECE_HEX_RECT_OFFSET_MASK, offset);
+}
+
+/*
+ * Set the line pitch (in bytes) for the frame buffers.
+ * Can be on of those values: 512, 1024, 2048, 2560 or 4096 bytes.
+ */
+static void npcm_video_ece_set_lp(struct npcm_video *video, u32 pitch)
+{
+	u32 lp;
+	struct regmap *ece = video->ece.regmap;
+
+	switch (pitch) {
+	case 512:
+		lp = ECE_RESOL_FB_LP_512;
+		break;
+	case 1024:
+		lp = ECE_RESOL_FB_LP_1024;
+		break;
+	case 2048:
+		lp = ECE_RESOL_FB_LP_2048;
+		break;
+	case 2560:
+		lp = ECE_RESOL_FB_LP_2560;
+		break;
+	case 4096:

drivers/media/platform/nuvoton/npcm-video.c new file +23 -0

+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_write(ece, ECE_HEX_RECT_OFFSET, 0);
+}
+
+static void npcm_video_ece_ctrl_reset(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+	regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS,
+			   ECE_HEX_CTRL_ENCDIS);
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN,
+			   ECE_DDA_CTRL_ECEEN);
+	regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS, 0);
+
+	npcm_video_ece_clear_rect_offset(video);
+}
+
+static void npcm_video_ece_ip_reset(struct npcm_video *video)
+{
+	/*

drivers/media/platform/nuvoton/npcm-video.c new file +197 -0

+}
+
+static bool npcm_video_alloc_buf(struct npcm_video *video,
+				 struct npcm_video_addr *addr, size_t size)
+{
+	if (size > VCD_MAX_SRC_BUFFER_SIZE)
+		size = VCD_MAX_SRC_BUFFER_SIZE;
+
+	addr->virt = dma_alloc_coherent(video->dev, size, &addr->dma,
+					GFP_KERNEL);
+
+	if (!addr->virt)
+		return false;
+
+	addr->size = size;
+	return true;
+}
+
+static void npcm_video_free_buf(struct npcm_video *video,
+				struct npcm_video_addr *addr)
+{
+	dma_free_coherent(video->dev, addr->size, addr->virt, addr->dma);
+	addr->size = 0;
+	addr->dma = 0ULL;
+	addr->virt = NULL;
+}
+
+static void npcm_video_free_diff_table(struct npcm_video *video)
+{
+	struct list_head *head, *pos, *nx;
+	struct rect_list *tmp;
+	unsigned int i;
+
+	for (i = 0; i < video->num_buffers; i++) {
+		head = &video->list[i];
+		list_for_each_safe(pos, nx, head) {
+			tmp = list_entry(pos, struct rect_list, list);
+			list_del(&tmp->list);
+			kfree(tmp);
+		}
+	}
+}
+
+static int npcm_video_add_rect(struct npcm_video *video, unsigned int index,
+			       u32 x, u32 y, u32 w, u32 h)
+{
+	struct list_head *head = &video->list[index];
+	struct rect_list *list = NULL;
+	struct v4l2_rect *r;
+
+	list = kzalloc(sizeof(*list), GFP_KERNEL);
+	if (!list)
+		return 0;
+
+	r = &list->clip.c;
+	r->left = x;
+	r->top = y;
+	r->width = w;
+	r->height = h;
+
+	list_add_tail(&list->list, head);
+	return 1;
+}
+
+static void npcm_video_merge_rect(struct npcm_video *video,
+				  struct rect_list_info *info)
+{
+	struct list_head *head = info->head;
+	struct rect_list *list = info->list;
+	struct rect_list *first = info->first;
+	struct v4l2_rect *r = &list->clip.c;
+	struct v4l2_rect *f = &first->clip.c;
+
+	if (!first) {
+		first = list;
+		info->first = first;
+		list_add_tail(&list->list, head);
+		video->rect_cnt++;
+	} else {
+		if ((r->left == (f->left + f->width)) && r->top == f->top) {
+			f->width += r->width;
+			kfree(list);
+		} else if ((r->top == (f->top + f->height)) &&
+			   (r->left == f->left)) {
+			f->height += r->height;
+			kfree(list);
+		} else if (((r->top > f->top) &&
+			   (r->top < (f->top + f->height))) &&
+			   ((r->left > f->left) &&
+			   (r->left < (f->left + f->width)))) {
+			kfree(list);
+		} else {
+			list_add_tail(&list->list, head);
+			video->rect_cnt++;
+			info->first = list;
+		}
+	}
+}
+
+static struct rect_list *npcm_video_new_rect(struct npcm_video *video,
+					     unsigned int offset,
+					     unsigned int index)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct rect_list *list = NULL;
+	struct v4l2_rect *r;
+
+	list = kzalloc(sizeof(*list), GFP_KERNEL);
+	if (!list)
+		return NULL;
+
+	r = &list->clip.c;
+
+	r->left = (offset << 4);
+	r->top = (index >> 2);
+	r->width = RECT_W;
+	r->height = RECT_H;
+	if ((r->left + RECT_W) > act->width)
+		r->width = act->width - r->left;
+	if ((r->top + RECT_H) > act->height)
+		r->height = act->height - r->top;
+
+	return list;
+}
+
+static int npcm_video_find_rect(struct npcm_video *video,
+				struct rect_list_info *info,
+				unsigned int offset)
+{
+	if (offset < info->tile_perline) {
+		info->list = npcm_video_new_rect(video, offset, info->index);
+		if (!info->list)
+			return -ENOMEM;
+
+		npcm_video_merge_rect(video, info);
+	}
+	return 0;
+}
+
+static int npcm_video_build_table(struct npcm_video *video,
+				  struct rect_list_info *info)
+{
+	int ret;
+	unsigned int j, bit;
+	u32 value;
+	struct regmap *vcd = video->vcd_regmap;
+
+	for (j = 0; j < info->offset_perline; j += 4) {
+		regmap_read(vcd, VCD_DIFF_TBL + (j + info->index), &value);
+
+		bitmap_from_arr32(bitmap, &value, BITMAP_SIZE);
+
+		for_each_set_bit(bit, bitmap, BITMAP_SIZE) {
+			ret = npcm_video_find_rect(video, info, bit + (j << 3));
+			if (ret < 0)
+				return ret;
+		}
+	}
+	info->index += 64;
+	return info->tile_perline;
+}
+
+static int npcm_video_get_rect_list(struct npcm_video *video,
+				    unsigned int index)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct rect_list_info info;
+	int ret = 0;
+	unsigned int mod, tile_cnt = 0;
+
+	memset(&info, 0, sizeof(struct rect_list_info));
+	info.head = &video->list[index];
+
+	info.tile_perline = act->width >> 4;
+	mod = act->width % RECT_W;
+	if (mod != 0)
+		info.tile_perline += 1;
+
+	info.tile_perrow = act->height >> 4;
+	mod = act->height % RECT_H;
+	if (mod != 0)
+		info.tile_perrow += 1;
+
+	info.tile_size = info.tile_perrow * info.tile_perline;
+
+	info.offset_perline = info.tile_perline >> 5;
+	mod = info.tile_perline % 32;
+	if (mod != 0)
+		info.offset_perline += 1;
+
+	info.offset_perline *= 4;
+
+	do {
+		ret = npcm_video_build_table(video, &info);
+		if (ret < 0)
+			return ret;
+		tile_cnt += ret;

drivers/media/platform/nuvoton/npcm-video.c new file +46 -0

+}
+
+static u8 npcm_video_is_mga(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	u32 dispst;
+
+	regmap_read(gfxi, DISPST, &dispst);
+	return ((dispst & DISPST_MGAMODE) == DISPST_MGAMODE);
+}
+
+static u32 npcm_video_hres(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	u32 hvcnth, hvcntl, apb_hor_res;
+
+	regmap_read(gfxi, HVCNTH, &hvcnth);
+	regmap_read(gfxi, HVCNTL, &hvcntl);
+	apb_hor_res = (((hvcnth & HVCNTH_MASK) << 8) +
+		       (hvcntl & HVCNTL_MASK) + 1);
+
+	return apb_hor_res;
+}
+
+static u32 npcm_video_vres(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	u32 vvcnth, vvcntl, apb_ver_res;
+
+	regmap_read(gfxi, VVCNTH, &vvcnth);
+	regmap_read(gfxi, VVCNTL, &vvcntl);
+
+	apb_ver_res = (((vvcnth & VVCNTH_MASK) << 8) + (vvcntl & VVCNTL_MASK));
+
+	return apb_ver_res;
+}
+
+static int npcm_video_capres(struct npcm_video *video, u32 hor_res,
+			     u32 vert_res)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 res, cap_res;
+
+	if (hor_res > MAX_WIDTH || vert_res > MAX_HEIGHT)
+		return -EINVAL;
+

drivers/media/platform/nuvoton/npcm-video.c new file +43 -0

+}
+
+static void npcm_video_vcd_ip_reset(struct npcm_video *video)
+{
+	/*
+	 * After resetting a module and clearing the reset bit, it should wait
+	 * at least 10 us before accessing the module.
+	 */
+	reset_control_assert(video->reset);
+	usleep_range(10, 20);
+	reset_control_deassert(video->reset);
+	usleep_range(10, 20);
+}
+
+static void npcm_video_vcd_state_machine_reset(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 stat;
+	int ret;
+
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, 0);
+
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, 0);
+
+	regmap_update_bits(vcd, VCD_CMD, VCD_CMD_RST, VCD_CMD_RST);
+
+	ret = regmap_read_poll_timeout(vcd, VCD_STAT, stat,
+				       (stat & VCD_STAT_DONE), 0,
+				       ECE_POLL_TIMEOUT_US);
+
+	if (ret) {
+		dev_warn(video->dev, "Wait for VCD_STAT_DONE timeout\n");
+		return;
+	}
+
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, VCD_MODE_VCDE);
+
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, VCD_MODE_IDBC);
+}
+
+static int npcm_video_gfx_reset(struct npcm_video *video)

drivers/media/platform/nuvoton/npcm-video.c new file +95 -0

+}
+
+static void npcm_video_kvm_bw(struct npcm_video *video, u8 bandwidth)
+{
+	struct regmap *vcd = video->vcd_regmap;
+
+	if (!npcm_video_is_mga(video))
+		bandwidth = 1;
+
+	if (bandwidth)
+		regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET,
+				   VCD_MODE_KVM_BW_SET);
+	else
+		regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET, 0);
+}
+
+static u32 npcm_video_pclk(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	u32 tmp, pllfbdiv, pllinotdiv, gpllfbdiv;
+	u8 gpllfbdv109, gpllfbdv8, gpllindiv;
+	u8 gpllst_pllotdiv1, gpllst_pllotdiv2;
+
+	regmap_read(gfxi, GPLLST, &tmp);
+	gpllfbdv109 = FIELD_GET(GPLLST_GPLLFBDV109, tmp);
+	gpllst_pllotdiv1 = FIELD_GET(GPLLST_PLLOTDIV1, tmp);
+	gpllst_pllotdiv2 = FIELD_GET(GPLLST_PLLOTDIV2, tmp);
+
+	regmap_read(gfxi, GPLLINDIV, &tmp);
+	gpllfbdv8 = FIELD_GET(GPLLINDIV_GPLLFBDV8, tmp);
+	gpllindiv = FIELD_GET(GPLLINDIV_MASK, tmp);
+
+	regmap_read(gfxi, GPLLFBDIV, &tmp);
+	gpllfbdiv = FIELD_GET(GPLLFBDIV_MASK, tmp);
+
+	pllfbdiv = (512 * gpllfbdv109 + 256 * gpllfbdv8 + gpllfbdiv);
+	pllinotdiv = (gpllindiv * gpllst_pllotdiv1 * gpllst_pllotdiv2);
+	if (pllfbdiv == 0 || pllinotdiv == 0)
+		return 0;
+
+	return ((pllfbdiv * 25000) / pllinotdiv) * 1000;
+}
+
+static int npcm_video_get_bpp(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 mode, color_cnvr;
+
+	regmap_read(vcd, VCD_MODE, &mode);
+
+	color_cnvr = FIELD_GET(VCD_MODE_COLOR_CNVRT, mode);
+
+	switch (color_cnvr) {
+	case VCD_MODE_COLOR_CNVRT_NO_CNVRT:
+		return 2;
+	case VCD_MODE_COLOR_CNVRT_RGB_222:
+	case VCD_MODE_COLOR_CNVRT_666_MODE:
+		return 1;
+	case VCD_MODE_COLOR_CNVRT_RGB_888:
+		return 4;
+	}
+	return 0;
+}
+
+/*
+ * Pitch must be a power of 2, >= linebytes,
+ * at least 512, and no more than 4096.
+ */
+static void npcm_video_set_linepitch(struct npcm_video *video, u32 linebytes)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 pitch = MIN_LP;
+
+	while ((pitch < linebytes) && (pitch < MAX_LP))
+		pitch *= 2;
+
+	regmap_write(vcd, VCD_FB_LP, FIELD_PREP(VCD_FBA_LP, pitch) |
+		     FIELD_PREP(VCD_FBB_LP, pitch));
+}
+
+static u32 npcm_video_get_linepitch(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 linepitch;
+
+	regmap_read(vcd, VCD_FB_LP, &linepitch);
+
+	return FIELD_GET(VCD_FBA_LP, linepitch);
+}
+
+static int npcm_video_command(struct npcm_video *video, u32 value)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	u32 cmd;
+

drivers/media/platform/nuvoton/npcm-video.c new file +29 -0

+}
+
+static int npcm_video_init_reg(struct npcm_video *video)
+{
+	struct regmap *gcr = video->gcr_regmap;
+	struct regmap *vcd = video->vcd_regmap;
+
+	/* Selects Data Enable */
+	regmap_update_bits(gcr, INTCR, INTCR_DEHS, 0);
+
+	/* Enable display of KVM GFX and access to memory */
+	regmap_update_bits(gcr, INTCR, INTCR_GFXIFDIS, 0);
+
+	/* Active Vertical/Horizontal Counters Reset */
+	regmap_update_bits(gcr, INTCR2, INTCR2_GIHCRST | INTCR2_GIVCRST,
+			   INTCR2_GIHCRST | INTCR2_GIVCRST);
+
+	/* Select KVM GFX input */
+	regmap_update_bits(gcr, MFSEL1, MFSEL1_DVH1SEL, 0);
+
+	/* Reset video modules */
+	npcm_video_vcd_ip_reset(video);
+	npcm_video_gfx_reset(video);
+
+	/* Set the FIFO thresholds */
+	regmap_write(vcd, VCD_FIFO, VCD_FIFO_TH);
+
+	/* Set video mode */
+	regmap_update_bits(vcd, VCD_MODE, 0xffffffff,

drivers/media/platform/nuvoton/npcm-video.c new file +1104 -0

+	unsigned long flags;
+	struct npcm_video_buffer *buf;
+	struct regmap *vcd = video->vcd_regmap;
+	u32 val;
+	int ret;
+
+	if (video->v4l2_input_status) {
+		dev_dbg(video->dev, "No video signal; skip capture frame\n");
+		return 0;
+	}
+
+	ret = regmap_read_poll_timeout(vcd, VCD_STAT, val,
+				       !(val & VCD_STAT_BUSY), 1000,
+				       VCD_BUSY_TIMEOUT_US);
+
+	if (ret) {
+		dev_err(video->dev, "Wait for VCD_STAT_BUSY timeout\n");
+		return -EBUSY;
+	}
+
+	spin_lock_irqsave(&video->lock, flags);
+	buf = list_first_entry_or_null(&video->buffers,
+				       struct npcm_video_buffer, link);
+	if (!buf) {
+		spin_unlock_irqrestore(&video->lock, flags);
+		dev_dbg(video->dev, "No empty buffers; skip capture frame\n");
+		return 0;
+	}
+
+	set_bit(VIDEO_FRAME_INPRG, &video->flags);
+	spin_unlock_irqrestore(&video->lock, flags);
+
+	npcm_video_vcd_state_machine_reset(video);
+
+	regmap_update_bits(vcd, VCD_INTE, VCD_INTE_DONE_IE | VCD_INTE_IFOT_IE |
+			   VCD_INTE_IFOR_IE, VCD_INTE_DONE_IE |
+			   VCD_INTE_IFOT_IE | VCD_INTE_IFOR_IE);
+
+	npcm_video_command(video, video->ctrl_cmd);
+
+	return 0;
+}
+
+static void npcm_video_bufs_done(struct npcm_video *video,
+				 enum vb2_buffer_state state)
+{
+	unsigned long flags;
+	struct npcm_video_buffer *buf;
+
+	spin_lock_irqsave(&video->lock, flags);
+	list_for_each_entry(buf, &video->buffers, link)
+		vb2_buffer_done(&buf->vb.vb2_buf, state);
+	INIT_LIST_HEAD(&video->buffers);
+	spin_unlock_irqrestore(&video->lock, flags);
+}
+
+static void npcm_video_get_diff_rect(struct npcm_video *video,
+				     unsigned int index)
+{
+	u32 width = video->active_timings.width;
+	u32 height = video->active_timings.height;
+
+	if (video->op_cmd != VCD_CMD_OPERATION_CAPTURE) {
+		video->rect_cnt = 0;
+		npcm_video_get_rect_list(video, index);
+		video->rect[index] = video->rect_cnt;
+	} else {
+		video->rect[index] = npcm_video_add_rect(video, index, 0, 0,
+							 width, height);
+	}
+}
+
+static irqreturn_t npcm_video_irq(int irq, void *arg)
+{
+	struct npcm_video *video = arg;
+	struct regmap *vcd = video->vcd_regmap;
+	struct npcm_video_buffer *buf;
+	struct rect_list *rect_list;
+	struct v4l2_rect *rect;
+	u32 status, ed_offset;
+	void *addr;
+	dma_addr_t vb_dma_addr;
+	unsigned int index, ed_size, total_size;
+
+	regmap_read(vcd, VCD_STAT, &status);
+	dev_dbg(video->dev, "VCD irq status 0x%x\n", status);
+
+	regmap_write(vcd, VCD_INTE, 0);
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+	if (test_bit(VIDEO_STOPPED, &video->flags) ||
+	    !test_bit(VIDEO_STREAMING, &video->flags)) {
+		clear_bit(VIDEO_FRAME_INPRG, &video->flags);
+		return IRQ_NONE;
+	}
+
+	if (status & VCD_STAT_DONE) {
+		spin_lock(&video->lock);
+		buf = list_first_entry_or_null(&video->buffers,
+					       struct npcm_video_buffer,
+					       link);
+
+		if (!buf) {
+			spin_unlock(&video->lock);
+			clear_bit(VIDEO_FRAME_INPRG, &video->flags);
+			return IRQ_NONE;
+		}
+
+		addr = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
+		vb_dma_addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf,
+							    0);
+		index = buf->vb.vb2_buf.index;
+
+		npcm_video_ece_ctrl_reset(video);
+		npcm_video_ece_clear_rect_offset(video);
+
+		npcm_video_ece_set_fb_addr(video, video->src.dma);
+
+		/* Set base address of encoded data to video buffer */
+		npcm_video_ece_set_enc_dba(video, vb_dma_addr);
+
+		npcm_video_ece_set_lp(video, video->bytesperline);
+		npcm_video_get_diff_rect(video, index);
+
+		total_size = 0;
+
+		list_for_each_entry(rect_list, &video->list[index], list) {
+			rect = &rect_list->clip.c;
+			ed_offset = npcm_video_ece_read_rect_offset(video);
+
+			npcm_video_ece_enc_rect(video, rect->left,
+						rect->top, rect->width,
+						rect->height);
+			ed_size = npcm_video_ece_get_ed_size(video,
+							     ed_offset,
+							     addr);
+
+			npcm_video_ece_prepend_rect_header(addr + ed_offset,
+							   rect->left,
+							   rect->top,
+							   rect->width,
+							   rect->height);
+
+			total_size += ed_size;
+		}
+
+		vb2_set_plane_payload(&buf->vb.vb2_buf, 0, total_size);
+		buf->vb.vb2_buf.timestamp = ktime_get_ns();
+		buf->vb.sequence = video->sequence++;
+		buf->vb.field = V4L2_FIELD_NONE;
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+		list_del(&buf->link);
+
+		spin_unlock(&video->lock);
+
+		clear_bit(VIDEO_FRAME_INPRG, &video->flags);
+	}
+
+	if (status & VCD_STAT_IFOR || status & VCD_STAT_IFOT) {
+		dev_warn(video->dev, "VCD FIFO overrun or over thresholds\n");
+		npcm_video_vcd_ip_reset(video);
+		npcm_video_gfx_reset(video);
+		npcm_video_start_frame(video);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void npcm_video_clear_gmmap(struct npcm_video *video)
+{
+	struct regmap *gcr = video->gcr_regmap;
+	u32 intcr, gmmap;
+	void __iomem *baseptr;
+
+	if (of_device_is_compatible(video->dev->of_node,
+				    "nuvoton,npcm750-vcd")) {
+		regmap_read(gcr, INTCR3, &intcr);
+		gmmap = FIELD_GET(INTCR3_GMMAP, intcr);
+
+		switch (gmmap) {
+		case INTCR3_GMMAP_128MB:
+			baseptr = ioremap_wc(ADDR_GMMAP_128MB, GMMAP_LENGTH);
+			break;
+		case INTCR3_GMMAP_256MB:
+			baseptr = ioremap_wc(ADDR_GMMAP_256MB, GMMAP_LENGTH);
+			break;
+		case INTCR3_GMMAP_512MB:
+			baseptr = ioremap_wc(ADDR_GMMAP_512MB, GMMAP_LENGTH);
+			break;
+		case INTCR3_GMMAP_1GB:
+			baseptr = ioremap_wc(ADDR_GMMAP_1GB, GMMAP_LENGTH);
+			break;
+		case INTCR3_GMMAP_2GB:
+			baseptr = ioremap_wc(ADDR_GMMAP_2GB, GMMAP_LENGTH);
+			break;
+		}
+	} else if (of_device_is_compatible(video->dev->of_node,
+					   "nuvoton,npcm845-vcd")) {
+		regmap_read(gcr, INTCR4, &intcr);
+		gmmap = FIELD_GET(INTCR4_GMMAP, intcr);
+
+		switch (gmmap) {
+		case INTCR4_GMMAP_512MB:
+			baseptr = ioremap_wc(ADDR_GMMAP_512MB, GMMAP_LENGTH);
+			break;
+		case INTCR4_GMMAP_512MB_ECC:
+			baseptr = ioremap_wc(ADDR_GMMAP_512MB_ECC,
+					     GMMAP_LENGTH);
+			break;
+		case INTCR4_GMMAP_1GB:
+			baseptr = ioremap_wc(ADDR_GMMAP_1GB, GMMAP_LENGTH);
+			break;
+		case INTCR4_GMMAP_1GB_ECC:
+			baseptr = ioremap_wc(ADDR_GMMAP_1GB_ECC, GMMAP_LENGTH);
+			break;
+		case INTCR4_GMMAP_2GB:
+			baseptr = ioremap_wc(ADDR_GMMAP_2GB, GMMAP_LENGTH);
+			break;
+		case INTCR4_GMMAP_2GB_ECC:
+			baseptr = ioremap_wc(ADDR_GMMAP_2GB_ECC, GMMAP_LENGTH);
+			break;
+		}
+	}
+
+	memset(baseptr, 0, GMMAP_LENGTH);
+	iounmap(baseptr);
+}
+
+static void npcm_video_get_resolution(struct npcm_video *video)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct v4l2_bt_timings *det = &video->detected_timings;
+	struct regmap *gfxi;
+	u32 dispst;
+
+	video->v4l2_input_status = 0;
+
+	det->width = npcm_video_hres(video);
+	det->height = npcm_video_vres(video);
+
+	if (act->width != det->width || act->height != det->height) {
+		dev_dbg(video->dev, "Resolution changed\n");
+
+		npcm_video_bufs_done(video, VB2_BUF_STATE_ERROR);
+
+		if (npcm_video_hres(video) > 0 && npcm_video_vres(video) > 0) {
+			gfxi = video->gfx_regmap;
+
+			if (test_bit(VIDEO_STREAMING, &video->flags)) {
+				/*
+				 * Wait for resolution is available,
+				 * and it is also captured by host.
+				 */
+				do {
+					mdelay(100);
+					regmap_read(gfxi, DISPST, &dispst);
+				} while (npcm_video_vres(video) < 100 ||
+					 npcm_video_pclk(video) == 0 ||
+					 (dispst & DISPST_HSCROFF));
+			}
+
+			det->width = npcm_video_hres(video);
+			det->height = npcm_video_vres(video);
+			det->pixelclock = npcm_video_pclk(video);
+		}
+	}
+
+	if (det->width == 0 || det->height == 0) {
+		det->width = MIN_WIDTH;
+		det->height = MIN_HEIGHT;
+		npcm_video_clear_gmmap(video);
+		video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+	}
+
+	dev_dbg(video->dev, "Got resolution[%dx%d] -> [%dx%d], status %d\n",
+		act->width, act->height, det->width, det->height,
+		video->v4l2_input_status);
+}
+
+static void npcm_video_set_resolution(struct npcm_video *video)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct regmap *vcd = video->vcd_regmap;
+	u32 mode;
+
+	/* Set video frame physical address */
+	regmap_write(vcd, VCD_FBA_ADR, video->src.dma);
+	regmap_write(vcd, VCD_FBB_ADR, video->src.dma);
+
+	npcm_video_capres(video, act->width, act->height);
+
+	video->bytesperpixel = npcm_video_get_bpp(video);
+	npcm_video_set_linepitch(video, act->width * video->bytesperpixel);
+
+	video->bytesperline = npcm_video_get_linepitch(video);
+
+	npcm_video_kvm_bw(video, act->pixelclock > VCD_KVM_BW_PCLK);
+
+	npcm_video_gfx_reset(video);
+
+	regmap_read(vcd, VCD_MODE, &mode);
+
+	clear_bit(VIDEO_FRAME_INPRG, &video->flags);
+
+	dev_dbg(video->dev, "VCD mode = 0x%x, %s mode\n", mode,
+		npcm_video_is_mga(video) ? "Hi Res" : "VGA");
+
+	dev_dbg(video->dev,
+		"Digital mode: %d x %d x %d, pixelclock %lld, bytesperline %d\n",
+		act->width, act->height, video->bytesperpixel, act->pixelclock,
+		video->bytesperline);
+}
+
+static int npcm_video_start(struct npcm_video *video)
+{
+	int rc;
+
+	rc = npcm_video_init_reg(video);
+	if (rc)
+		return rc;
+
+	npcm_video_get_resolution(video);
+
+	video->active_timings = video->detected_timings;
+
+	video->max_buffer_size = VCD_MAX_SRC_BUFFER_SIZE;
+	if (!npcm_video_alloc_buf(video, &video->src, video->max_buffer_size))
+		return -ENOMEM;
+
+	npcm_video_set_resolution(video);
+
+	video->pix_fmt.width = video->active_timings.width;
+	video->pix_fmt.height = video->active_timings.height;
+	video->pix_fmt.sizeimage = video->max_buffer_size;
+	video->pix_fmt.bytesperline = video->bytesperline;
+
+	if (atomic_inc_return(&video->ece.clients) == 1) {
+		npcm_video_ece_init(video);
+		npcm_video_ece_set_fb_addr(video, video->src.dma);
+		npcm_video_ece_set_lp(video, video->bytesperline);
+
+		dev_dbg(video->dev, "ECE open: client %d\n",
+			atomic_read(&video->ece.clients));
+	}
+
+	return 0;
+}
+
+static void npcm_video_stop(struct npcm_video *video)
+{
+	unsigned long flags;
+	struct regmap *vcd = video->vcd_regmap;
+
+	spin_lock_irqsave(&video->lock, flags);
+	set_bit(VIDEO_STOPPED, &video->flags);
+	spin_unlock_irqrestore(&video->lock, flags);
+
+	regmap_write(vcd, VCD_INTE, 0);
+	regmap_write(vcd, VCD_MODE, 0);
+	regmap_write(vcd, VCD_RCHG, 0);
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+	if (video->src.size)
+		npcm_video_free_buf(video, &video->src);
+
+	if (video->list)
+		npcm_video_free_diff_table(video);
+
+	kfree(video->list);
+	video->list = NULL;
+
+	kfree(video->rect);
+	video->rect = NULL;
+
+	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+	video->flags = 0;
+	video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+
+	if (atomic_dec_return(&video->ece.clients) == 0) {
+		npcm_video_ece_stop(video);
+		dev_dbg(video->dev, "ECE close: client %d\n",
+			atomic_read(&video->ece.clients));
+	}
+}
+
+static int npcm_video_querycap(struct file *file, void *fh,
+			       struct v4l2_capability *cap)
+{
+	strscpy(cap->driver, DEVICE_NAME, sizeof(cap->driver));
+	strscpy(cap->card, "NPCM Video Engine", sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+		 DEVICE_NAME);
+
+	return 0;
+}
+
+static int npcm_video_enum_format(struct file *file, void *fh,
+				  struct v4l2_fmtdesc *f)
+{
+	if (f->index)
+		return -EINVAL;
+
+	f->pixelformat = V4L2_PIX_FMT_HEXTILE;
+
+	return 0;
+}
+
+static int npcm_video_get_format(struct file *file, void *fh,
+				 struct v4l2_format *f)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	f->fmt.pix = video->pix_fmt;
+
+	return 0;
+}
+
+static int npcm_video_enum_input(struct file *file, void *fh,
+				 struct v4l2_input *inp)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	if (inp->index)
+		return -EINVAL;
+
+	strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
+	inp->type = V4L2_INPUT_TYPE_CAMERA;
+	inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
+	inp->status = video->v4l2_input_status;
+
+	return 0;
+}
+
+static int npcm_video_get_input(struct file *file, void *fh, unsigned int *i)
+{
+	*i = 0;
+
+	return 0;
+}
+
+static int npcm_video_set_input(struct file *file, void *fh, unsigned int i)
+{
+	if (i)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int npcm_video_get_parm(struct file *file, void *fh,
+			       struct v4l2_streamparm *a)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	a->parm.capture.readbuffers = 3;
+	a->parm.capture.timeperframe.numerator = 1;
+	if (!video->frame_rate)
+		a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE;
+	else
+		a->parm.capture.timeperframe.denominator = video->frame_rate;
+
+	return 0;
+}
+
+static int npcm_video_set_parm(struct file *file, void *fh,
+			       struct v4l2_streamparm *a)
+{
+	unsigned int frame_rate = 0;
+
+	a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	a->parm.capture.readbuffers = 3;
+
+	if (a->parm.capture.timeperframe.numerator)
+		frame_rate = a->parm.capture.timeperframe.denominator /
+			     a->parm.capture.timeperframe.numerator;
+
+	if (!frame_rate || frame_rate > MAX_FRAME_RATE) {
+		frame_rate = 0;
+		a->parm.capture.timeperframe.denominator = MAX_FRAME_RATE;
+		a->parm.capture.timeperframe.numerator = 1;
+	}
+
+	return 0;
+}
+
+static int npcm_video_set_dv_timings(struct file *file, void *fh,
+				     struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	if (timings->bt.width == video->active_timings.width &&
+	    timings->bt.height == video->active_timings.height)
+		return 0;
+
+	if (vb2_is_busy(&video->queue)) {
+		dev_err(video->dev, "%s device busy\n", __func__);
+		return -EBUSY;
+	}
+
+	video->active_timings = timings->bt;
+
+	npcm_video_set_resolution(video);
+
+	video->pix_fmt.width = timings->bt.width;
+	video->pix_fmt.height = timings->bt.height;
+	video->pix_fmt.sizeimage = video->max_buffer_size;
+	video->pix_fmt.bytesperline = video->bytesperline;
+
+	timings->type = V4L2_DV_BT_656_1120;
+
+	return 0;
+}
+
+static int npcm_video_get_dv_timings(struct file *file, void *fh,
+				     struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	timings->type = V4L2_DV_BT_656_1120;
+	timings->bt = video->active_timings;
+
+	return 0;
+}
+
+static int npcm_video_query_dv_timings(struct file *file, void *fh,
+				       struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	npcm_video_get_resolution(video);
+
+	timings->type = V4L2_DV_BT_656_1120;
+	timings->bt = video->detected_timings;
+
+	return video->v4l2_input_status ? -ENOLINK : 0;
+}
+
+static int npcm_video_enum_dv_timings(struct file *file, void *fh,
+				      struct v4l2_enum_dv_timings *timings)
+{
+	return v4l2_enum_dv_timings_cap(timings, &npcm_video_timings_cap,
+					NULL, NULL);
+}
+
+static int npcm_video_dv_timings_cap(struct file *file, void *fh,
+				     struct v4l2_dv_timings_cap *cap)
+{
+	*cap = npcm_video_timings_cap;
+
+	return 0;
+}
+
+static int npcm_video_sub_event(struct v4l2_fh *fh,
+				const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subscribe(fh, sub);
+	}
+
+	return v4l2_ctrl_subscribe_event(fh, sub);
+}
+
+static const struct v4l2_ioctl_ops npcm_video_ioctls = {
+	.vidioc_querycap = npcm_video_querycap,
+
+	.vidioc_enum_fmt_vid_cap = npcm_video_enum_format,
+	.vidioc_g_fmt_vid_cap = npcm_video_get_format,
+	.vidioc_s_fmt_vid_cap = npcm_video_get_format,
+	.vidioc_try_fmt_vid_cap = npcm_video_get_format,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_expbuf = vb2_ioctl_expbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+
+	.vidioc_enum_input = npcm_video_enum_input,
+	.vidioc_g_input = npcm_video_get_input,
+	.vidioc_s_input = npcm_video_set_input,
+
+	.vidioc_g_parm = npcm_video_get_parm,
+	.vidioc_s_parm = npcm_video_set_parm,
+
+	.vidioc_s_dv_timings = npcm_video_set_dv_timings,
+	.vidioc_g_dv_timings = npcm_video_get_dv_timings,
+	.vidioc_query_dv_timings = npcm_video_query_dv_timings,
+	.vidioc_enum_dv_timings = npcm_video_enum_dv_timings,
+	.vidioc_dv_timings_cap = npcm_video_dv_timings_cap,
+
+	.vidioc_subscribe_event = npcm_video_sub_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static int npcm_video_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct npcm_video *video = container_of(ctrl->handler,
+						struct npcm_video,
+						ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_NPCM_CAPTURE_MODE:
+		if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_COMPLETE)
+			video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+		else if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_DIFF)
+			video->ctrl_cmd = VCD_CMD_OPERATION_COMPARE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int npcm_video_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct npcm_video *video = container_of(ctrl->handler,
+						struct npcm_video,
+						ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_NPCM_RECT_COUNT:
+		ctrl->val = npcm_video_get_rect_count(video);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops npcm_video_ctrl_ops = {
+	.s_ctrl = npcm_video_set_ctrl,
+	.g_volatile_ctrl = npcm_video_get_volatile_ctrl,
+};
+
+static const struct v4l2_ctrl_config npcm_ctrl_capture_mode = {
+	.ops = &npcm_video_ctrl_ops,
+	.id = V4L2_CID_NPCM_CAPTURE_MODE,
+	.name = "NPCM Video Capture Mode",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.min = 0,
+	.max = V4L2_NPCM_CAPTURE_MODE_DIFF,
+	.step = 1,
+	.def = 0,
+};
+
+static const struct v4l2_ctrl_config npcm_ctrl_rect_count = {
+	.ops = &npcm_video_ctrl_ops,
+	.id = V4L2_CID_NPCM_RECT_COUNT,
+	.name = "NPCM Compressed Hextile Rectangle Count",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.flags = V4L2_CTRL_FLAG_VOLATILE,
+	.min = 0,
+	.max = (MAX_WIDTH / RECT_W) * (MAX_HEIGHT / RECT_H),
+	.step = 1,
+	.def = 0,
+};
+
+static int npcm_video_open(struct file *file)
+{
+	int rc;
+	struct npcm_video *video = video_drvdata(file);
+
+	mutex_lock(&video->video_lock);
+
+	rc = v4l2_fh_open(file);
+	if (rc) {
+		mutex_unlock(&video->video_lock);
+		return rc;
+	}
+
+	if (v4l2_fh_is_singular_file(file))
+		npcm_video_start(video);
+
+	mutex_unlock(&video->video_lock);
+
+	return 0;
+}
+
+static int npcm_video_release(struct file *file)
+{
+	int rc;
+	struct npcm_video *video = video_drvdata(file);
+
+	mutex_lock(&video->video_lock);
+
+	if (v4l2_fh_is_singular_file(file))
+		npcm_video_stop(video);
+
+	rc = _vb2_fop_release(file, NULL);
+
+	mutex_unlock(&video->video_lock);
+
+	return rc;
+}
+
+static const struct v4l2_file_operations npcm_video_v4l2_fops = {
+	.owner = THIS_MODULE,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+	.open = npcm_video_open,
+	.release = npcm_video_release,
+};
+
+static int npcm_video_queue_setup(struct vb2_queue *q,
+				  unsigned int *num_buffers,
+				  unsigned int *num_planes,
+				  unsigned int sizes[],
+				  struct device *alloc_devs[])
+{
+	struct npcm_video *video = vb2_get_drv_priv(q);
+	unsigned int i;
+
+	if (*num_planes) {
+		if (sizes[0] < video->max_buffer_size)
+			return -EINVAL;
+
+		return 0;
+	}
+
+	*num_planes = 1;
+	sizes[0] = video->max_buffer_size;
+
+	kfree(video->rect);
+	video->rect = NULL;
+
+	video->rect = kcalloc(*num_buffers, sizeof(*video->rect), GFP_KERNEL);
+	if (!video->rect)
+		return -ENOMEM;
+
+	if (video->list) {
+		npcm_video_free_diff_table(video);
+		kfree(video->list);
+		video->list = NULL;
+	}
+
+	video->list = kzalloc(sizeof(*video->list) * *num_buffers, GFP_KERNEL);
+	if (!video->list) {
+		kfree(video->rect);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < *num_buffers; i++)
+		INIT_LIST_HEAD(&video->list[i]);
+
+	video->num_buffers = *num_buffers;
+
+	return 0;
+}
+
+static int npcm_video_buf_prepare(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+
+	if (vb2_plane_size(vb, 0) < video->max_buffer_size)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int npcm_video_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	int rc;
+	struct npcm_video *video = vb2_get_drv_priv(q);
+
+	video->sequence = 0;
+
+	rc = npcm_video_start_frame(video);
+	if (rc) {
+		npcm_video_bufs_done(video, VB2_BUF_STATE_QUEUED);
+		return rc;
+	}
+
+	set_bit(VIDEO_STREAMING, &video->flags);
+	return 0;
+}
+
+static void npcm_video_stop_streaming(struct vb2_queue *q)
+{
+	struct npcm_video *video = vb2_get_drv_priv(q);
+	struct regmap *vcd = video->vcd_regmap;
+
+	clear_bit(VIDEO_STREAMING, &video->flags);
+
+	regmap_write(vcd, VCD_INTE, 0);
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+	npcm_video_gfx_reset(video);
+
+	npcm_video_bufs_done(video, VB2_BUF_STATE_ERROR);
+
+	video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+}
+
+static void npcm_video_buf_queue(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct npcm_video_buffer *nvb = to_npcm_video_buffer(vbuf);
+	unsigned long flags;
+
+	spin_lock_irqsave(&video->lock, flags);
+	list_add_tail(&nvb->link, &video->buffers);
+	spin_unlock_irqrestore(&video->lock, flags);
+}
+
+static void npcm_video_buf_finish(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	struct regmap *vcd = video->vcd_regmap;
+	u32 val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(vcd, VCD_STAT, val,
+				       !(val & VCD_STAT_BUSY), 1000,
+				       VCD_BUSY_TIMEOUT_US);
+
+	if (ret) {
+		dev_warn(video->dev, "Wait for VCD_STAT_BUSY timeout\n");
+		return;
+	}
+
+	/* Capture next frame when a video buffer is dequeued */
+	npcm_video_start_frame(video);
+
+	video->vb_index = vb->index;
+}
+
+static const struct vb2_ops npcm_video_vb2_ops = {
+	.queue_setup = npcm_video_queue_setup,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+	.buf_prepare = npcm_video_buf_prepare,
+	.buf_finish = npcm_video_buf_finish,
+	.start_streaming = npcm_video_start_streaming,
+	.stop_streaming = npcm_video_stop_streaming,
+	.buf_queue =  npcm_video_buf_queue,
+};
+
+static int npcm_video_setup_video(struct npcm_video *video)
+{
+	struct v4l2_device *v4l2_dev = &video->v4l2_dev;
+	struct video_device *vdev = &video->vdev;
+	struct vb2_queue *vbq = &video->queue;
+	int rc;
+
+	video->pix_fmt.pixelformat = V4L2_PIX_FMT_HEXTILE;
+	video->pix_fmt.field = V4L2_FIELD_NONE;
+	video->pix_fmt.colorspace = V4L2_COLORSPACE_SRGB;
+	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+
+	rc = v4l2_device_register(video->dev, v4l2_dev);
+	if (rc) {
+		dev_err(video->dev, "Failed to register v4l2 device\n");
+		return rc;
+	}
+
+	v4l2_ctrl_handler_init(&video->ctrl_handler, 2);
+	v4l2_ctrl_new_custom(&video->ctrl_handler, &npcm_ctrl_capture_mode,
+			     NULL);
+	v4l2_ctrl_new_custom(&video->ctrl_handler, &npcm_ctrl_rect_count, NULL);
+
+	if (video->ctrl_handler.error) {
+		dev_err(video->dev, "Failed to init controls: %d\n",
+			video->ctrl_handler.error);
+
+		rc = video->ctrl_handler.error;
+		goto rel_ctrl_handler;
+	}
+
+	v4l2_dev->ctrl_handler = &video->ctrl_handler;
+
+	vbq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	vbq->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
+	vbq->dev = v4l2_dev->dev;
+	vbq->lock = &video->video_lock;
+	vbq->ops = &npcm_video_vb2_ops;
+	vbq->mem_ops = &vb2_dma_contig_memops;
+	vbq->drv_priv = video;
+	vbq->buf_struct_size = sizeof(struct npcm_video_buffer);
+	vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	vbq->min_buffers_needed = 3;
+
+	rc = vb2_queue_init(vbq);
+	if (rc) {
+		dev_err(video->dev, "Failed to init vb2 queue\n");
+		goto rel_ctrl_handler;
+	}
+
+	vdev->queue = vbq;
+	vdev->fops = &npcm_video_v4l2_fops;
+	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
+			    V4L2_CAP_STREAMING;
+	vdev->v4l2_dev = v4l2_dev;
+	strscpy(vdev->name, DEVICE_NAME, sizeof(vdev->name));
+	vdev->vfl_type = VFL_TYPE_VIDEO;
+	vdev->vfl_dir = VFL_DIR_RX;
+	vdev->release = video_device_release_empty;
+	vdev->ioctl_ops = &npcm_video_ioctls;
+	vdev->lock = &video->video_lock;
+
+	video_set_drvdata(vdev, video);
+	rc = video_register_device(vdev, VFL_TYPE_VIDEO, 0);
+	if (rc) {
+		dev_err(video->dev, "Failed to register video device\n");
+		goto rel_vb_queue;
+	}
+
+	return 0;
+
+rel_vb_queue:
+	vb2_queue_release(vbq);
+rel_ctrl_handler:
+	v4l2_ctrl_handler_free(&video->ctrl_handler);
+	v4l2_device_unregister(v4l2_dev);
+
+	return rc;
+}
+
+static int npcm_video_init(struct npcm_video *video)
+{
+	int irq;
+	int rc;
+	struct device *dev = video->dev;
+
+	irq = irq_of_parse_and_map(dev->of_node, 0);
+	if (!irq) {
+		dev_err(dev, "Failed to find VCD IRQ\n");
+		return -ENODEV;
+	}
+
+	rc = devm_request_threaded_irq(dev, irq, NULL, npcm_video_irq,
+				       IRQF_ONESHOT, DEVICE_NAME, video);
+	if (rc < 0) {
+		dev_err(dev, "Failed to request IRQ %d\n", irq);
+		return rc;
+	}
+
+	of_reserved_mem_device_init(dev);
+
+	rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (rc) {
+		dev_err(dev, "Failed to set DMA mask\n");
+		of_reserved_mem_device_release(dev);
+	}
+
+	return rc;
+}
+
+static const struct regmap_config npcm_video_regmap_cfg = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= VCD_FIFO,
+};
+
+static const struct regmap_config npcm_video_ece_regmap_cfg = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= ECE_HEX_RECT_OFFSET,
+};
+
+static int npcm_video_probe(struct platform_device *pdev)
+{
+	int rc;
+	void __iomem *regs;
+	struct npcm_video *video = kzalloc(sizeof(*video), GFP_KERNEL);
+	struct device_node *ece_node;
+	struct platform_device *ece_pdev;
+
+	if (!video)
+		return -ENOMEM;
+
+	video->frame_rate = MAX_FRAME_RATE;
+	video->dev = &pdev->dev;
+	spin_lock_init(&video->lock);
+	mutex_init(&video->video_lock);
+	INIT_LIST_HEAD(&video->buffers);
+
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs)) {
+		dev_err(&pdev->dev, "Failed to parse VCD reg in DTS\n");
+		return PTR_ERR(regs);
+	}
+
+	video->vcd_regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+						  &npcm_video_regmap_cfg);
+	if (IS_ERR(video->vcd_regmap)) {
+		dev_err(&pdev->dev, "Failed to initialize VCD regmap\n");
+		return PTR_ERR(video->vcd_regmap);
+	}
+
+	ece_node = of_parse_phandle(video->dev->of_node, "nuvoton,ece", 0);
+	if (IS_ERR(ece_node)) {
+		dev_err(&pdev->dev, "Failed to get ECE phandle in DTS\n");
+		return PTR_ERR(ece_node);
+	}
+
+	ece_pdev = of_find_device_by_node(ece_node);
+	of_node_put(ece_node);
+	if (IS_ERR(ece_pdev)) {
+		dev_err(&pdev->dev, "Failed to find ECE device\n");
+		return PTR_ERR(ece_pdev);
+	}
+
+	regs = devm_platform_ioremap_resource(ece_pdev, 0);
+	if (IS_ERR(regs)) {
+		dev_err(&pdev->dev, "Failed to parse ECE reg in DTS\n");
+		return PTR_ERR(regs);
+	}
+
+	video->ece.regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+						  &npcm_video_ece_regmap_cfg);
+	if (IS_ERR(video->ece.regmap)) {
+		dev_err(&pdev->dev, "Failed to initialize ECE regmap\n");
+		return PTR_ERR(video->ece.regmap);
+	}
+
+	video->reset = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(video->reset)) {
+		dev_err(&pdev->dev, "Failed to get VCD reset control in DTS\n");
+		return PTR_ERR(video->reset);
+	}
+
+	video->ece.reset = devm_reset_control_get(&ece_pdev->dev, NULL);
+	if (IS_ERR(video->ece.reset)) {
+		dev_err(&pdev->dev, "Failed to get ECE reset control in DTS\n");
+		return PTR_ERR(video->ece.reset);
+	}
+
+	video->gcr_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+							    "nuvoton,sysgcr");
+	if (IS_ERR(video->gcr_regmap))
+		return PTR_ERR(video->gcr_regmap);
+
+	video->gfx_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+							    "nuvoton,sysgfxi");
+	if (IS_ERR(video->gfx_regmap))
+		return PTR_ERR(video->gfx_regmap);
+
+	rc = npcm_video_init(video);
+	if (rc)
+		return rc;
+
+	rc = npcm_video_setup_video(video);
+	if (rc)
+		return rc;
+
+	dev_info(video->dev, "NPCM video driver probed\n");
+
+	return 0;
+}
+
+static int npcm_video_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+	struct npcm_video *video = to_npcm_video(v4l2_dev);
+
+	video_unregister_device(&video->vdev);
+
+	vb2_queue_release(&video->queue);
+
+	v4l2_ctrl_handler_free(&video->ctrl_handler);
+
+	v4l2_device_unregister(v4l2_dev);
+
+	npcm_video_ece_stop(video);
+
+	of_reserved_mem_device_release(dev);
+
+	return 0;
+}
+
+static const struct of_device_id npcm_video_match[] = {
+	{ .compatible = "nuvoton,npcm750-vcd" },
+	{ .compatible = "nuvoton,npcm845-vcd" },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, npcm_video_match);
+
+static struct platform_driver npcm_video_driver = {
+	.driver = {
+		.name = DEVICE_NAME,
+		.of_match_table = npcm_video_match,
+	},
+	.probe = npcm_video_probe,
+	.remove = npcm_video_remove,
+};
+
+module_platform_driver(npcm_video_driver);
+
+MODULE_AUTHOR("Joseph Liu<[email protected]>");
+MODULE_AUTHOR("Marvin Lin<[email protected]>");
+MODULE_DESCRIPTION("Driver for Nuvoton NPCM Video Capture/Encode Engine");
+MODULE_LICENSE("GPL");

Quoted 1 line

+static void npcm_video_ece_set_fb_addr(struct npcm_video *video, u32 buffer)

static inline void?

Quoted 1 line

+static void npcm_video_ece_set_enc_dba(struct npcm_video *video, u32 addr)

ditto

Quoted 1 line

+static void npcm_video_ece_clear_rect_offset(struct npcm_video *video)

ditto

Quoted 1 line

+static int npcm_video_ece_init(struct npcm_video *video)

static inline int? But...

drivers/media/platform/nuvoton/npcm-video.c line 334

Quoted 5 lines

drivers/media/platform/nuvoton/npcm-video.c new file +5 -0

+{
+     npcm_video_ece_ip_reset(video);
+     npcm_video_ece_ctrl_reset(video);
+
+     return 0;

...the return value is not inspected by the only caller anyway, so why not

static inline void?

Quoted 6 lines

drivers/media/platform/nuvoton/npcm-video.c new file +6 -0

+static int npcm_video_ece_stop(struct npcm_video *video)
+{
+     struct regmap *ece = video->ece.regmap;
+
+     regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+     regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_INTEN, 0);

drivers/media/platform/nuvoton/npcm-video.c line 334

Quoted 5 lines

drivers/media/platform/nuvoton/npcm-video.c new file +5 -0

+     regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS,
+                        ECE_HEX_CTRL_ENCDIS);
+     npcm_video_ece_clear_rect_offset(video);
+
+     return 0;

Nobody inspects this return value. Either void, or check the return value at call site and handle a non-zero failure.

drivers/media/platform/nuvoton/npcm-video.c line 554

Quoted 5 lines

drivers/media/platform/nuvoton/npcm-video.c new file +5 -0

+static unsigned int npcm_video_get_rect_count(struct npcm_video *video)
+{
+     struct list_head *head, *pos, *nx;
+     struct rect_list *tmp;
+     unsigned int count;

        unsigned int count = 0;

otherwise if the below condition is not met, ...

drivers/media/platform/nuvoton/npcm-video.c line 564

Quoted 10 lines

drivers/media/platform/nuvoton/npcm-video.c new file +10 -0

+
+     if (video->list && video->rect) {
+             count = video->rect[video->vb_index];
+             head = &video->list[video->vb_index];
+
+             list_for_each_safe(pos, nx, head) {
+                     tmp = list_entry(pos, struct rect_list, list);
+                     list_del(&tmp->list);
+                     kfree(tmp);
+             }

why does a function whose name implies merely getting a number actually remove all elements from some list? count equals video->rect[video->vb_index]; and everthing else looks like a(n indented?) side effect. This should be somehow commented in the code.

drivers/media/platform/nuvoton/npcm-video.c line 567

Quoted 3 lines

drivers/media/platform/nuvoton/npcm-video.c new file +3 -0

+     }
+
+     return count;

... an undefined number is returned

Which makes me wonder if the compiler is not warning about using a possibly uninitialized value.

Quoted 9 lines

drivers/media/platform/nuvoton/npcm-video.c new file +9 -0

+static int npcm_video_capres(struct npcm_video *video, u32 hor_res,
+                          u32 vert_res)
+{
+     struct regmap *vcd = video->vcd_regmap;
+     u32 res, cap_res;
+
+     if (hor_res > MAX_WIDTH || vert_res > MAX_HEIGHT)
+             return -EINVAL;
+

drivers/media/platform/nuvoton/npcm-video.c line 623

Quoted 10 lines

drivers/media/platform/nuvoton/npcm-video.c new file +10 -0

+     res = FIELD_PREP(VCD_CAP_RES_VERT_RES, vert_res) |
+           FIELD_PREP(VCD_CAP_RES_HOR_RES, hor_res);
+
+     regmap_write(vcd, VCD_CAP_RES, res);
+     regmap_read(vcd, VCD_CAP_RES, &cap_res);
+
+     if (cap_res != res)
+             return -EINVAL;
+
+     return 0;

The return value is not handled by the caller

drivers/media/platform/nuvoton/npcm-video.c line 676

Quoted 11 lines

drivers/media/platform/nuvoton/npcm-video.c new file +11 -0

+static int npcm_video_gfx_reset(struct npcm_video *video)
+{
+     struct regmap *gcr = video->gcr_regmap;
+
+     regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, INTCR2_GIRST2);
+
+     npcm_video_vcd_state_machine_reset(video);
+
+     regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, 0);
+
+     return 0;

Never inspected by callers

Quoted 5 lines

drivers/media/platform/nuvoton/npcm-video.c new file +5 -0

+static int npcm_video_command(struct npcm_video *video, u32 value)
+{
+     struct regmap *vcd = video->vcd_regmap;
+     u32 cmd;
+

drivers/media/platform/nuvoton/npcm-video.c line 781

Quoted 10 lines

drivers/media/platform/nuvoton/npcm-video.c new file +10 -0

+     regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+     regmap_read(vcd, VCD_CMD, &cmd);
+     cmd |= FIELD_PREP(VCD_CMD_OPERATION, value);
+
+     regmap_write(vcd, VCD_CMD, cmd);
+     regmap_update_bits(vcd, VCD_CMD, VCD_CMD_GO, VCD_CMD_GO);
+     video->op_cmd = value;
+
+     return 0;

Never inspected by caller

drivers/media/platform/nuvoton/npcm-video.c line 820

Quoted 2 lines

drivers/media/platform/nuvoton/npcm-video.c new file +2 -0

+static int npcm_video_start_frame(struct npcm_video *video)
+{

One of the callers ignores the return value, but not the other. Why?