diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2016-12-02 13:16:35 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-12-05 14:15:46 +0100 |
| commit | ef3d232245ab7a1bf361c52449e612e4c8b7c5ab (patch) | |
| tree | 0e6d579644349f6efa511681faadaba24b9e9b58 /drivers/mmc/core/mmc.c | |
| parent | db52d4f8a4bde36263a7cc9d46ff20b243562ac9 (diff) | |
mmc: mmc: Relax checking for switch errors after HS200 switch
The JEDEC specification indicates CMD13 can be used after a HS200 switch
to check for errors. However in practice some boards experience CRC errors
in the CMD13 response. Consequently, for HS200, CRC errors are not a
reliable way to know the switch failed. If there really is a problem, we
would expect tuning will fail and the result ends up the same. So change
the error condition to ignore CRC errors in that case.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 033e00abe93f..b61b52f9da3d 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1240,7 +1240,12 @@ int mmc_hs400_to_hs200(struct mmc_card *card) mmc_set_timing(host, MMC_TIMING_MMC_HS200); - err = mmc_switch_status(card); + /* + * For HS200, CRC errors are not a reliable way to know the switch + * failed. If there really is a problem, we would expect tuning will + * fail and the result ends up the same. + */ + err = __mmc_switch_status(card, false); if (err) goto out_err; @@ -1403,7 +1408,13 @@ static int mmc_select_hs200(struct mmc_card *card) old_timing = host->ios.timing; mmc_set_timing(host, MMC_TIMING_MMC_HS200); - err = mmc_switch_status(card); + /* + * For HS200, CRC errors are not a reliable way to know the + * switch failed. If there really is a problem, we would expect + * tuning will fail and the result ends up the same. + */ + err = __mmc_switch_status(card, false); + /* * mmc_select_timing() assumes timing has not changed if * it is a switch error. |