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sm501fb: Ensure panel interface is not tristated when setup

PATCH In review Antonino A. Daplas 1 participant 1 message Jul 26, 2007 Framebuffer layer

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Antonino A. Daplas

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PATCH 26/33 sm501fb: Ensure panel interface is not tristated when setup

From: Ben Dooks <[email protected]>

When we setup the panel interface whilst configuring the framebuffer, we should ensure the panel interface is not in tristate, in case the bootloader or previous setup has not enabled it.

Signed-off-by Ben Dooks <[email protected]>
Signed-off-by Antonino Daplas <[email protected]>

---

 drivers/video/sm501fb.c    |    5 +++++
 include/linux/sm501-regs.h |   18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)
drivers/video/sm501fb.c +5 -0
index d97edd7..1be95a6 100644
@@ -777,6 +777,11 @@ static int sm501fb_set_par_pnl(struct fb
 	writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
 	sm501fb_sync_regs(fbi);
 
+	/* ensure the panel interface is not tristated at this point */
+
+	sm501_modify_reg(fbi->dev->parent, SM501_SYSTEM_CONTROL,
+			 0, SM501_SYSCTRL_PANEL_TRISTATE);
+
 	/* power the panel up */
 	sm501fb_panel_power(fbi, 1);
 	return 0;
include/linux/sm501-regs.h +18 -0
index 014e73b..df7620d 100644
@@ -15,6 +15,24 @@ #define SM501_SYS_CONFIG		(0x000000)
 
 /* config 1 */
 #define SM501_SYSTEM_CONTROL 		(0x000000)
+
+#define SM501_SYSCTRL_PANEL_TRISTATE	(1<<0)
+#define SM501_SYSCTRL_MEM_TRISTATE	(1<<1)
+#define SM501_SYSCTRL_CRT_TRISTATE	(1<<2)
+
+#define SM501_SYSCTRL_PCI_SLAVE_BURST_MASK (3<<4)
+#define SM501_SYSCTRL_PCI_SLAVE_BURST_1	(0<<4)
+#define SM501_SYSCTRL_PCI_SLAVE_BURST_2	(1<<4)
+#define SM501_SYSCTRL_PCI_SLAVE_BURST_4	(2<<4)
+#define SM501_SYSCTRL_PCI_SLAVE_BURST_8	(3<<4)
+
+#define SM501_SYSCTRL_PCI_CLOCK_RUN_EN	(1<<6)
+#define SM501_SYSCTRL_PCI_RETRY_DISABLE	(1<<7)
+#define SM501_SYSCTRL_PCI_SUBSYS_LOCK	(1<<11)
+#define SM501_SYSCTRL_PCI_BURST_READ_EN	(1<<15)
+
+/* miscellaneous control */
+
 #define SM501_MISC_CONTROL		(0x000004)
 
 #define SM501_MISC_BUS_SH		(0x0)

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