mmc: core: Add sd discard timeout

The busy timeout is 250msec per discard command.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 681b089f669a..2d415cb1889a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -51,6 +51,7 @@
 
 /* The max erase timeout, used when host->max_busy_timeout isn't specified */
 #define MMC_ERASE_TIMEOUT_MS    (60 * 1000) /* 60 s */
+#define SD_DISCARD_TIMEOUT_MS   (250)
 
 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 
@@ -1619,6 +1620,12 @@ static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
 {
         unsigned int erase_timeout;
 
+        /* for DISCARD none of the below calculation applies.
+         * the busy timeout is 250msec per discard command.
+         */
+        if (arg == SD_DISCARD_ARG)
+                return SD_DISCARD_TIMEOUT_MS;
+
         if (card->ssr.erase_timeout) {
                 /* Erase timeout specified in SD Status Register (SSR) */
                 erase_timeout = card->ssr.erase_timeout * qty +