diff options
| author | Haibo Chen <haibo.chen@nxp.com> | 2017-09-04 17:26:08 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | f8fe40d1aa62a9a993af25765a71fb92e96c459f (patch) | |
| tree | aae01e0ba24edff0e2c309c8b1ac506ec05c46ce /drivers/mmc/host | |
| parent | d1432d1066b5caf5cfbc0ee2c2821714dba8d9aa (diff) | |
MLK-16363 mmc: sdhci: add 1ms delay after tuning complete
When the last ready-buffer-ready is set, then usdhc execute-tuning
bit is clear, this means usdhc finish the tuning process, but at
this time, sd/mmc card may still out put the tuning data, can't
response to any command. So this patch add 1ms delay when usdhc
finish the tuning, make sure sd/mmc card finish sending the tuning
data, then sd/mmc can response the following command normally.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6b0967fb8dcd..c498da5b46b2 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2119,8 +2119,16 @@ static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) { - if (ctrl & SDHCI_CTRL_TUNED_CLK) + if (ctrl & SDHCI_CTRL_TUNED_CLK) { + /* + * need to wait some time, make sure sd/mmc fininsh + * send out tuning data, otherwise, the sd/mmc can't + * response to any command when the card still out + * put the tuning data. + */ + mdelay(1); return; /* Success! */ + } break; } |