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enable HPI for supported card

PATCH Superseded Chuanxiao Dong 2 participants 2 messages Nov 23, 2010 – Nov 24, 2010 MMC, SD and SDIO

v1 of 2 Superseded Latest is v2 →

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Chuanxiao Dong

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#0 lore raw

PATCH 3/4 enable HPI for supported card

Quoted 1 line

From 78d7ca58fe6ea3b850ee3682a3552e16fc9faa15 Mon Sep 17 00:00:00 2001

From: Chuanxiao Dong <[email protected]>
Date: Tue, 23 Nov 2010 12:09:57 +0800
Subject: [PATCH 3/4] mmc: Enabled HPI feature

HPI feature is a new feature in eMMC4.41 standard. It will be used to interrupt background operations and low priority foreground operations

Signed-off-by Chuanxiao Dong <[email protected]>
---
 drivers/mmc/core/mmc.c   |   32 ++++++++++++++++++++++++++++++++
 include/linux/mmc/card.h |    2 ++
 include/linux/mmc/mmc.h  |    2 ++
 3 files changed, 36 insertions(+), 0 deletions(-)
drivers/mmc/core/mmc.c +32 -0
index 471ed82..c3f8e24 100644
@@ -318,6 +318,20 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 				ext_csd[EXT_CSD_BKOPS_EN];
 		}
 
+		/* check whether the eMMC card support HPI */
+		if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
+			card->ext_csd.hpi = 1;
+			card->ext_csd.hpi_en =
+				ext_csd[EXT_CSD_HPI_MGMT];
+			card->ext_csd.hpi_cmd =
+				ext_csd[EXT_CSD_HPI_FEATURES] & 0x2;
+			if ((card->ext_csd.hpi_cmd != MMC_SEND_STATUS) &&
+					(card->ext_csd.hpi_cmd !=
+					 MMC_STOP_TRANSMISSION)) {
+				card->ext_csd.hpi = 0;
+				card->ext_csd.hpi_en = 0;
+			}
+		}
 	}
 
 	if (ext_csd[EXT_CSD_ERASED_MEM_CONT])

@@ -510,6 +524,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	}
 
 	/*
+	 * enable HPI feature if eMMC card support
+	 */
+	if (card->ext_csd.hpi) {
+		if (!card->ext_csd.hpi_en) {
+			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+					EXT_CSD_HPI_MGMT, 1);
+			if (err && err != -EBADMSG)
+				goto free_card;
+
+			if (err) {
+				card->ext_csd.hpi_en = 0;
+				err = 0;
+			} else
+				card->ext_csd.bkops_en = 1;
+		}
+	}
+
+	/*
 	 * Activate high speed (if supported)
 	 */
 	if ((card->ext_csd.hs_max_dtr != 0) &&
include/linux/mmc/card.h +2 -0
index 4142ab5..efb2c56 100644
@@ -57,6 +57,8 @@ struct mmc_ext_csd {
 	unsigned int		bkops:1; /* background support bit */
 	unsigned int		bkops_en:1; /* background enable bit */
 	unsigned int		hpi_en:1; /* HPI enable bit */
+	unsigned int		hpi:1; /* HPI support bit */
+	unsigned int		hpi_cmd; /* cmd used to for HPI */
 };
 
 struct sd_scr {
include/linux/mmc/mmc.h +2 -0
index ef85e90..ab1eb41 100644
@@ -252,6 +252,7 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
+#define EXT_CSD_HPI_MGMT		161	/* R/W */
 #define EXT_CSD_BKOPS_EN		163	/* R/W */
 #define EXT_CSD_BKOPS_START		164	/* W */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */

@@ -270,6 +271,7 @@ struct _mmc_csd {
 #define EXT_CSD_SEC_FEATURE_SUPPORT	231	/* RO */
 #define EXT_CSD_TRIM_MULT		232	/* RO */
 #define EXT_CSD_BKOPS_SUPPORT	502	/* RO */
+#define EXT_CSD_HPI_FEATURES	503	/* RO */
 
 /*
  * EXT_CSD field definitions
Signature · 1 line
1.6.6.1
#1 lore raw
Quoted 49 lines · Chuanxiao Dong

From 78d7ca58fe6ea3b850ee3682a3552e16fc9faa15 Mon Sep 17 00:00:00 2001
From: Chuanxiao Dong <[email protected]>
Date: Tue, 23 Nov 2010 12:09:57 +0800
Subject: [PATCH 3/4] mmc: Enabled HPI feature

HPI feature is a new feature in eMMC4.41 standard. It will be used to interrupt background operations and low priority foreground operations

Signed-off-by Chuanxiao Dong <[email protected]>

---
 drivers/mmc/core/mmc.c   |   32 ++++++++++++++++++++++++++++++++ include/linux/mmc/card.h |    2 ++ include/linux/mmc/mmc.h  |    2 ++

 3 files changed, 36 insertions(+), 0 deletions(-)
drivers/mmc/core/mmc.c +18 -0
index 471ed82..c3f8e24 100644
@@ -318,6 +318,20 @@ static int mmc_read_ext_csd(struct mmc_card *card)
                                ext_csd[EXT_CSD_BKOPS_EN];
                }
 
+               /* check whether the eMMC card support HPI */
+               if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
+                       card->ext_csd.hpi = 1;
+                       card->ext_csd.hpi_en =
+                               ext_csd[EXT_CSD_HPI_MGMT];
+                       card->ext_csd.hpi_cmd =
+                               ext_csd[EXT_CSD_HPI_FEATURES] & 0x2;
+                       if ((card->ext_csd.hpi_cmd != MMC_SEND_STATUS) &&
+                                       (card->ext_csd.hpi_cmd !=
+                                        MMC_STOP_TRANSMISSION)) {
+                               card->ext_csd.hpi = 0;
+                               card->ext_csd.hpi_en = 0;
+                       }
+               }
        }
 
        if (ext_csd[EXT_CSD_ERASED_MEM_CONT])

@@ -510,6 +524,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
        }
 
        /*
+        * enable HPI feature if eMMC card support
+        */
+       if (card->ext_csd.hpi) {
+               if (!card->ext_csd.hpi_en) {

drivers/mmc/core/mmc.c static int mmc_init_card(struct mmc_host *host, u32 ocr, · line 540

Quoted 10 lines
drivers/mmc/core/mmc.c +10 -0
+                       err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+                                       EXT_CSD_HPI_MGMT, 1);
+                       if (err && err != -EBADMSG)
+                               goto free_card;
+
+                       if (err) {
+                               card->ext_csd.hpi_en = 0;
+                               err = 0;
+                       } else
+                               card->ext_csd.bkops_en = 1;

                           should card->ext_csd.hpi_en = 1;

Thank you,
Kyungmin Park

Quoted 48 lines
drivers/mmc/core/mmc.c +4 -0
+               }
+       }
+
+       /*
         * Activate high speed (if supported)
         */

       if ((card->ext_csd.hs_max_dtr != 0) &&

include/linux/mmc/card.h +0 -0
index 4142ab5..efb2c56 100644
@@ -57,6 +57,8 @@ struct mmc_ext_csd {

       unsigned int            bkops:1; /* background support bit */ unsigned int            bkops_en:1; /* background enable bit */ unsigned int            hpi_en:1; /* HPI enable bit */
+       unsigned int            hpi:1; /* HPI support bit */
+       unsigned int            hpi_cmd; /* cmd used to for HPI */ };

 struct sd_scr {

include/linux/mmc/mmc.h +2 -1
index ef85e90..ab1eb41 100644
@@ -252,6 +252,7 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
+#define EXT_CSD_HPI_MGMT               161     /* R/W */
  #define EXT_CSD_BKOPS_EN               163     /* R/W */
  #define EXT_CSD_BKOPS_START            164     /* W */
  #define EXT_CSD_ERASE_GROUP_DEF                175     /* R/W */

@@ -270,6 +271,7 @@ struct _mmc_csd {
  #define EXT_CSD_SEC_FEATURE_SUPPORT    231     /* RO */
  #define EXT_CSD_TRIM_MULT              232     /* RO */
  #define EXT_CSD_BKOPS_SUPPORT  502     /* RO */
+#define EXT_CSD_HPI_FEATURES   503     /* RO */
 
  /*
  * EXT_CSD field definitions
--

1.6.6.1

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