[PATCH v3] mmc: remove MMC_CAP_ERASE to enable trim in eMMC device

[Puthikorn Voravootivat <puthik@chromium.org>]

Remove host erase capacity check to enable trim and
discard feature in supported eMMC device.

Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
---
v3 change:
As suggested by Jaehoon, this patch remove MMC_CAP_ERASE instead of
force enable it.

v2 change:
Instead of add MMC_CAP_ERASE just only for dw_mmc, this patch adds
this capability to all host.

 arch/arm/mach-ux500/board-mop500-sdi.c | 3 ---
 drivers/mmc/core/core.c                | 6 ++----
 drivers/mmc/host/omap_hsmmc.c          | 2 +-
 drivers/mmc/host/sdhci.c               | 2 +-
 include/linux/mmc/host.h               | 1 -
 5 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/arm/mach-ux500/board-mop500-sdi.c b/arch/arm/mach-ux500/board-mop500-sdi.c
index fcbf3a1..6d9feb8 100644
--- a/arch/arm/mach-ux500/board-mop500-sdi.c
+++ b/arch/arm/mach-ux500/board-mop500-sdi.c
@@ -48,7 +48,6 @@ struct mmci_platform_data mop500_sdi0_data = {
 	.capabilities	= MMC_CAP_4_BIT_DATA |
 				MMC_CAP_SD_HIGHSPEED |
 				MMC_CAP_MMC_HIGHSPEED |
-				MMC_CAP_ERASE |
 				MMC_CAP_UHS_SDR12 |
 				MMC_CAP_UHS_SDR25,
 	.gpio_wp	= -1,
@@ -119,7 +118,6 @@ struct mmci_platform_data mop500_sdi2_data = {
 				MMC_CAP_8_BIT_DATA |
 				MMC_CAP_NONREMOVABLE |
 				MMC_CAP_MMC_HIGHSPEED |
-				MMC_CAP_ERASE |
 				MMC_CAP_CMD23,
 	.gpio_cd	= -1,
 	.gpio_wp	= -1,
@@ -154,7 +152,6 @@ struct mmci_platform_data mop500_sdi4_data = {
 				MMC_CAP_8_BIT_DATA |
 				MMC_CAP_NONREMOVABLE |
 				MMC_CAP_MMC_HIGHSPEED |
-				MMC_CAP_ERASE |
 				MMC_CAP_CMD23,
 	.gpio_cd	= -1,
 	.gpio_wp	= -1,
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 098374b..82de9f1 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2007,8 +2007,7 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
 {
 	unsigned int rem, to = from + nr;
 
-	if (!(card->host->caps & MMC_CAP_ERASE) ||
-	    !(card->csd.cmdclass & CCC_ERASE))
+	if (!(card->csd.cmdclass & CCC_ERASE))
 		return -EOPNOTSUPP;
 
 	if (!card->erase_size)
@@ -2062,8 +2061,7 @@ EXPORT_SYMBOL(mmc_erase);
 
 int mmc_can_erase(struct mmc_card *card)
 {
-	if ((card->host->caps & MMC_CAP_ERASE) &&
-	    (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
+	if ((card->csd.cmdclass & CCC_ERASE) && card->erase_size)
 		return 1;
 	return 0;
 }
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index dbd32ad..99d8558 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1873,7 +1873,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	mmc->max_seg_size = mmc->max_req_size;
 
 	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
-		     MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE;
+		     MMC_CAP_WAIT_WHILE_BUSY;
 
 	mmc->caps |= mmc_slot(host).caps;
 	if (mmc->caps & MMC_CAP_8_BIT_DATA)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9ddef47..6a50141 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2943,7 +2943,7 @@ int sdhci_add_host(struct sdhci_host *host)
 
 	mmc->max_discard_to = (1 << 27) / host->timeout_clk;
 
-	mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
+	mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23;
 
 	if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
 		host->flags |= SDHCI_AUTO_CMD12;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 99f5709..8b1bfab 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -242,7 +242,6 @@ struct mmc_host {
 #define MMC_CAP_AGGRESSIVE_PM	(1 << 7)	/* Suspend (e)MMC/SD at idle  */
 #define MMC_CAP_NONREMOVABLE	(1 << 8)	/* Nonremovable e.g. eMMC */
 #define MMC_CAP_WAIT_WHILE_BUSY	(1 << 9)	/* Waits while card is busy */
-#define MMC_CAP_ERASE		(1 << 10)	/* Allow erase/trim commands */
 #define MMC_CAP_1_8V_DDR	(1 << 11)	/* can support */
 						/* DDR mode at 1.8V */
 #define MMC_CAP_1_2V_DDR	(1 << 12)	/* can support */
-- 
1.9.0.rc1.175.g0b1dcb5