On Tue, Apr 18, 2017 at 06:05:31PM +0800, Haibo Chen wrote: > USDHC tuning circuit should be reset before every time card enumeration > or re-enumeration. > > SD3.0 card need tuning. For SDR104 card, when system suspend in standby > mode, and then resume back, the IO timing is still SDR104(tuned) which > may result in card re-enumeration fail in low card speed(400khz) for some > cards. And we did meet the issue that in certain probability, SDR104 > card meet mmc command CRC/Timeout error when send CMD2 during mmc bus > resume. > > This patch reset the tuning circuit when the ios timing is > MMC_TIMING_LEGACY/MMC_TIMING_MMC_HS/MMC_TIMING_SD_HS, which means both > mmc_power_up() and mmc_power_off() will reset the tuning circuit. > > Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx> Acked-by: Dong Aisheng <aisheng.dong@xxxxxxx> Regards Dong Aisheng -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
