From ee6ff743e3a4b697e8286054667d7e4e1b56510d Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Fri, 13 Jan 2017 12:05:03 +0100 Subject: [PATCH] mmc: core: Restore parts of the polling policy when switch to HS/HS DDR Regressions for not being able to detect an eMMC HS DDR mode card has been reported for the sdhci-esdhc-imx driver, but potentially other sdhci variants may suffer from the similar problem. The commit e173f8911f09 ("mmc: core: Update CMD13 polling policy when switch to HS DDR mode"), is causing the problem. It seems that change moved one step to far, regarding changing the host's timing before polling for a busy card. To fix this, let's move back to the behaviour when the host's timing is updated after the polling, but before the switch status is fetched and validated. In cases when polling with CMD13, we keep validating the switch status at each attempt. However, to align with the other card busy detections mechanism, let's fetch and validate the switch status also after the host's timing is updated. Reported-by: Clemens Gruber Reported-by: Gary Bisson Fixes: e173f8911f09 ("mmc: core: Update CMD13 polling policy when switch..") Cc: Shawn Lin Cc: Dong Aisheng Cc: Haibo Chen Signed-off-by: Ulf Hansson Tested-by: Clemens Gruber Tested-by: Jagan Teki Reviewed-by: Shawn Lin Tested-by: Haibo Chen Reviewed-by: Dong Aisheng --- drivers/mmc/core/mmc_ops.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index b11c345..e6ea850 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -506,9 +506,6 @@ static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms, } } while (busy); - if (host->ops->card_busy && send_status) - return mmc_switch_status(card); - return 0; } @@ -577,24 +574,26 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, if (!use_busy_signal) goto out; - /* Switch to new timing before poll and check switch status. */ - if (timing) - mmc_set_timing(host, timing); - /*If SPI or used HW busy detection above, then we don't need to poll. */ if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) || - mmc_host_is_spi(host)) { - if (send_status) - err = mmc_switch_status(card); + mmc_host_is_spi(host)) goto out_tim; - } /* Let's try to poll to find out when the command is completed. */ err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err); + if (err) + goto out; out_tim: - if (err && timing) - mmc_set_timing(host, old_timing); + /* Switch to new timing before check switch status. */ + if (timing) + mmc_set_timing(host, timing); + + if (send_status) { + err = mmc_switch_status(card); + if (err && timing) + mmc_set_timing(host, old_timing); + } out: mmc_retune_release(host); -- 2.7.4