Adrian Hunter da3c6d0708 mmc: core: Fix inconsistent sd3_bus_mode at UHS-I SD voltage switch failure ...

commit 63f1560930 upstream.

If re-initialization results is a different signal voltage, because the
voltage switch failed previously, but not this time (or vice versa), then
sd3_bus_mode will be inconsistent with the card because the SD_SWITCH
command is done only upon first initialization.

Fix by always reading SD_SWITCH information during re-initialization, which
also means it does not need to be re-read later for the 1.8V fixup
workaround.

Note, brief testing showed SD_SWITCH took about 1.8ms to 2ms which added
about 1% to 1.5% to the re-initialization time, so it's not particularly
significant.

Reported-by: Seunghui Lee <sh043.lee@samsung.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Seunghui Lee <sh043.lee@samsung.com>
Tested-by: Seunghui Lee <sh043.lee@samsung.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220815073321.63382-3-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-09-08 12:28:04 +02:00

..

core

mmc: core: Fix inconsistent sd3_bus_mode at UHS-I SD voltage switch failure

2022-09-08 12:28:04 +02:00

host

mmc: sdhci-of-dwcmshc: Re-enable support for the BlueField-3 SoC

2022-09-05 10:30:09 +02:00

Kconfig

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Makefile

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