https://github.com/torvalds/linux
Revision 39a72dbfe188291b156dd6523511e3d5761ce775 authored by Yann Gautier on 28 October 2022, 07:37:40 UTC, committed by Ulf Hansson on 16 November 2022, 12:58:01 UTC
In mmc_select_voltage(), if there is no full power cycle, the voltage
range selected at the end of the function will be on a single range
(e.g. 3.3V/3.4V). To keep a range around the selected voltage (3.2V/3.4V),
the mask shift should be reduced by 1.

This issue was triggered by using a specific SD-card (Verbatim Premium
16GB UHS-1) on an STM32MP157C-DK2 board. This board cannot do UHS modes
and there is no power cycle. And the card was failing to switch to
high-speed mode. When adding the range 3.2V/3.3V for this card with the
proposed shift change, the card can switch to high-speed mode.

Fixes: ce69d37b7d8f ("mmc: core: Prevent violation of specs while initializing cards")
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20221028073740.7259-1-yann.gautier@foss.st.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
1 parent 094226a
History
Tip revision: 39a72dbfe188291b156dd6523511e3d5761ce775 authored by Yann Gautier on 28 October 2022, 07:37:40 UTC
mmc: core: properly select voltage range without power cycle
Tip revision: 39a72db
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