| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 024/323] mmc: core: Do a power cycle when the CMD11 fails | Date | Thu, 20 May 2021 11:18:36 +0200 |
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From: DooHyun Hwang <dh0421.hwang@samsung.com>
commit 147186f531ae49c18b7a9091a2c40e83b3d95649 upstream.
A CMD11 is sent to the SD/SDIO card to start the voltage switch procedure into 1.8V I/O. According to the SD spec a power cycle is needed of the card, if it turns out that the CMD11 fails. Let's fix this, to allow a retry of the initialization without the voltage switch, to succeed.
Note that, whether it makes sense to also retry with the voltage switch after the power cycle is a bit more difficult to know. At this point, we treat it like the CMD11 isn't supported and therefore we skip it when retrying.
Signed-off-by: DooHyun Hwang <dh0421.hwang@samsung.com> Link: https://lore.kernel.org/r/20210210045936.7809-1-dh0421.hwang@samsung.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/mmc/core/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1506,7 +1506,7 @@ int mmc_set_uhs_voltage(struct mmc_host err = mmc_wait_for_cmd(host, &cmd, 0); if (err) - return err; + goto power_cycle; if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) return -EIO;
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