>From d596be94f87b86ccb372a4ae55ee478951524895 Mon Sep 17 00:00:00 2001
From: Prasanna NAVARATNA <prasanna.navaratna@xxxxxxxxxxxx>
Date: Fri, 30 Aug 2013 17:18:32 +0530
Subject: [PATCH] mmc: enable BKOPS for supported eMMC(4.41)
BKOPS feature is optional for eMMC 4.41. If an eMMC supports BKOPS
and is of version 4.41 then BKOPS feature is ignored and not enabled.
Enable BKOPS for such eMMC. Also a capability is added to control
the enabling of feature (only for eMMC 4.41, not valid for 4.5)
Signed-off-by: Prasanna NAVARATNA <prasanna.navaratna@xxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 18 ++++++++++++++++++
include/linux/mmc/host.h | 1 +
2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6d02012..fc44fd7 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1269,6 +1269,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
/*
+ * Enable BKOPS feature (if supported and not enabled)
+ */
+ if (!card->ext_csd.bkops_en && (host->caps2 & MMC_CAP2_BKOPS_EN) &&
+ (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1)) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BKOPS_EN, 1,
+ card->ext_csd.generic_cmd6_time);
+ if (err && err != -EBADMSG)
+ goto free_card;
+ if (err) {
+ pr_warning("%s: Enabling BKOPS failed\n",
+ mmc_hostname(card->host));
+ err = 0;
+ } else
+ card->ext_csd.bkops_en = 1;
+ }
+
+ /*
* Enable HPI feature (if supported)
*/
if (card->ext_csd.hpi) {
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 3b0c33a..2c79487 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -281,6 +281,7 @@ struct mmc_host {
MMC_CAP2_PACKED_WR)
#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
#define MMC_CAP2_SANITIZE (1 << 15) /* Support Sanitize */
+#define MMC_CAP2_BKOPS_EN (1 << 16) /* Enable BKOPS */
mmc_pm_flag_t pm_caps; /* supported pm features */
--
1.7.6
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