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mmc: core: fix dead loop of mmc_retune 

When get a CRC error, start the mmc_retune, it will issue CMD19/CMD21
to do tune, assume there were 10 clock phase need to try, phase 0 to
phase 6 is ok, phase 7 to phase 9 is NG, we try it from 0 to 9, so
the last CMD19/CMD21 will get CRC error, host->need_retune was set and
cause mmc_retune was called, then dead loop of mmc_retune

Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: bd11e8bd03 ("mmc: core: Flag re-tuning is needed on CRC errors")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chaotian Jing 2015-09-30 17:37:18 +08:00 committed by Ulf Hansson
parent fd546ee6a7
commit 031277d4d3
1 changed files with 4 additions and 2 deletions
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6
drivers/mmc/core/core.c
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@ -134,9 +134,11 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
int err = cmd->error; int err = cmd->error;
/* Flag re-tuning needed on CRC errors */ /* Flag re-tuning needed on CRC errors */
if (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) || if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
(err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
(mrq->data && mrq->data->error == -EILSEQ) || (mrq->data && mrq->data->error == -EILSEQ) ||
(mrq->stop && mrq->stop->error == -EILSEQ)) (mrq->stop && mrq->stop->error == -EILSEQ)))
mmc_retune_needed(host); mmc_retune_needed(host);
if (err && cmd->retries && mmc_host_is_spi(host)) { if (err && cmd->retries && mmc_host_is_spi(host)) {