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mmc: mtk-sd: receive cmd8 data when hs400 tuning fail

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When we use cmd8 as the tuning command in hs400 mode, the command
response sent back by some eMMC devices cannot be correctly sampled
by MTK eMMC controller at some weak sample timing. In this case,
command timeout error may occur. So we must receive the following
data to make sure the next cmd8 send correctly.

Signed-off-by: Mengqi Zhang <mengqi.zhang@mediatek.com>
Fixes: c4ac38c653 ("mmc: mtk-sd: Add HS400 online tuning support")
Cc: stable@vger.stable.com
Link: https://lore.kernel.org/r/20240716013704.10578-1-mengqi.zhang@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Mengqi Zhang 2024-07-16 09:37:04 +08:00 committed by Ulf Hansson
parent 8400291e28
commit 9374ae912d
1 changed files with 4 additions and 4 deletions
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8
drivers/mmc/host/mtk-sd.c
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@ -1230,7 +1230,7 @@ static bool msdc_cmd_done(struct msdc_host *host, int events,
}
if (!sbc_error && !(events & MSDC_INT_CMDRDY)) {
if (events & MSDC_INT_CMDTMO ||
if ((events & MSDC_INT_CMDTMO && !host->hs400_tuning) ||
(!mmc_op_tuning(cmd->opcode) && !host->hs400_tuning))
/*
* should not clear fifo/interrupt as the tune data
@ -1323,9 +1323,9 @@ static void msdc_start_command(struct msdc_host *host,
static void msdc_cmd_next(struct msdc_host *host,
struct mmc_request *mrq, struct mmc_command *cmd)
{
if ((cmd->error &&
!(cmd->error == -EILSEQ &&
(mmc_op_tuning(cmd->opcode) || host->hs400_tuning))) ||
if ((cmd->error && !host->hs400_tuning &&
!(cmd->error == -EILSEQ &&
mmc_op_tuning(cmd->opcode))) ||
(mrq->sbc && mrq->sbc->error))
msdc_request_done(host, mrq);
else if (cmd == mrq->sbc)