Revert "mmc: core: do not retry CMD6 in __mmc_switch()"

Turns out the commit 112f3c1310f2 ("mmc: core: do not retry CMD6 in
__mmc_switch()") breaks initialization of a Toshiba THGBMNG5 eMMC card,
when using the meson-gx-mmc.c driver on a custom board based on Amlogic
A113D.

The CMD6 that switches the card into HS200 mode is then one that fails and
according to the below printed messages from the log:

[    1.648951] mmc0: mmc_select_hs200 failed, error -84
[    1.648988] mmc0: error -84 whilst initialising MMC card

After some analyze, it turns out that adding a delay of ~5ms inside
mmc_select_bus_width() but after mmc_compare_ext_csds() has been executed,
also fixes the problem. Adding yet some more debug code, trying to figure
out if potentially the card could be in a busy state, both by using CMD13
and ->card_busy() ops concluded that this was not the case.

Therefore, let's simply revert the commit that dropped support for retrying
of CMD6, as this also fixes the problem.

Fixes: 112f3c1310f2 ("mmc: core: do not retry CMD6 in __mmc_switch()")
Cc: stable@vger.kernel.org
Signed-off-by: Jan Kaisrlik <ja.kaisrlik@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 74e4364bc9fb5df992cffe028db41e3de1072415..09113b9ad67907822ed7e53bcae652e40ec44f4c 100644 (file)
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -564,7 +564,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
        if (index == EXT_CSD_SANITIZE_START)
                cmd.sanitize_busy = true;
 
-       err = mmc_wait_for_cmd(host, &cmd, 0);
+       err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
        if (err)
                goto out;