[PATCH v2] mmc: enable trim in eMMC device

[Puthikorn Voravootivat <puthik@chromium.org>]

Force all host to have erase capacity to enable trim or
discard feature in supported eMMC device.

Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
---
V2 change:
Instead of add MMC_CAP_ERASE just only for dw_mmc, this patch adds
this capability to all host.

 drivers/mmc/core/host.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 49bc403..a21f590 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -521,6 +521,8 @@ int mmc_add_host(struct mmc_host *host)
 	WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
 		!host->ops->enable_sdio_irq);
 
+	host->caps |= MMC_CAP_ERASE;
+
 	err = device_add(&host->class_dev);
 	if (err)
 		return err;
-- 
1.9.0.rc1.175.g0b1dcb5