mmc: core: Add quirk for long data read time

Adds a quirk that sets the data read timeout to a fixed value instead
of relying on the information in the CSD. The timeout value chosen
is 300ms since that has proven enough for the problematic cards found,
but could be increased if other cards require this.

This patch also enables this quirk for certain Micron cards known to
have this problem.

Signed-off-by: Stefan Nilsson XK <stefan.xk.nilsson@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: <stable@kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index a1cb21f95302..1e0e27cbe987 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1606,6 +1606,14 @@ static const struct mmc_fixup blk_fixups[] =
                   MMC_QUIRK_BLK_NO_CMD23),
         MMC_FIXUP("MMC32G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
                   MMC_QUIRK_BLK_NO_CMD23),
+
+        /*
+         * Some Micron MMC cards needs longer data read timeout than
+         * indicated in CSD.
+         */
+        MMC_FIXUP(CID_NAME_ANY, 0x13, 0x200, add_quirk_mmc,
+                  MMC_QUIRK_LONG_READ_TIME),
+
         END_FIXUP
 };
 
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5278ffb20e74..74a012ad2bab 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -529,6 +529,18 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
                         data->timeout_clks = 0;
                 }
         }
+
+        /*
+         * Some cards require longer data read timeout than indicated in CSD.
+         * Address this by setting the read timeout to a "reasonably high"
+         * value. For the cards tested, 300ms has proven enough. If necessary,
+         * this value can be increased if other problematic cards require this.
+         */
+        if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
+                data->timeout_ns = 300000000;
+                data->timeout_clks = 0;
+        }
+
         /*
          * Some cards need very high timeouts if driven in SPI mode.
          * The worst observed timeout was 900ms after writing a