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mmc: add additional quirk for APP_CMD retry

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It was observed (on ClearFog Base) that sending MMC APP_CMD returned
an error on the first attempt. The issue appears to be timing related
since even inserting a puts() short debug entry before the execution
added sufficient delay to receive success on first attempt.

Follow the existing quirks pattern to retry if initial issuance
failed so as to not introduce any delay unless needed.

Signed-off-by: Joel Johnson <mrjoel@lixil.net>
This commit is contained in:
Joel Johnson
2020-01-11 09:08:14 -07:00
committed by Peng Fan
parent f1bce08426
commit d4a5fa314d
2 changed files with 17 additions and 1 deletions
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include/mmc.h
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@@ -331,6 +331,7 @@ static inline bool mmc_is_tuning_cmd(uint cmdidx)
#define MMC_QUIRK_RETRY_SEND_CID BIT(0)
#define MMC_QUIRK_RETRY_SET_BLOCKLEN BIT(1)
#define MMC_QUIRK_RETRY_APP_CMD BIT(2)
enum mmc_voltage {
MMC_SIGNAL_VOLTAGE_000 = 0,