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

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[ Upstream commit 63f1560930e4e1c4f6279b8ae715c9841fe1a6d3 ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Adrian Hunter
2022-08-15 10:33:21 +03:00
committed by Greg Kroah-Hartman
parent 7780b3dda2
commit b3f2adf426
1 changed files with 16 additions and 26 deletions
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16
drivers/mmc/core/sd.c
View File

@@ -932,14 +932,15 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
/* Erase init depends on CSD and SSR */ /* Erase init depends on CSD and SSR */
mmc_init_erase(card); mmc_init_erase(card);
}
/* /*
* Fetch switch information from card. * Fetch switch information from card. Note, sd3_bus_mode can change if
* voltage switch outcome changes, so do this always.
*/ */
err = mmc_read_switch(card); err = mmc_read_switch(card);
if (err) if (err)
return err; return err;
}
/* /*
* For SPI, enable CRC as appropriate. * For SPI, enable CRC as appropriate.
@@ -1089,16 +1090,6 @@ retry:
if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
mmc_sd_card_using_v18(card) && mmc_sd_card_using_v18(card) &&
host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
/*
* Re-read switch information in case it has changed since
* oldcard was initialized.
*/
if (oldcard) {
err = mmc_read_switch(card);
if (err)
goto free_card;
}
if (mmc_sd_card_using_v18(card)) {
if (mmc_host_set_uhs_voltage(host) || if (mmc_host_set_uhs_voltage(host) ||
mmc_sd_init_uhs_card(card)) { mmc_sd_init_uhs_card(card)) {
v18_fixup_failed = true; v18_fixup_failed = true;
@@ -1109,7 +1100,6 @@ retry:
} }
goto cont; goto cont;
} }
}
/* Initialization sequence for UHS-I cards */ /* Initialization sequence for UHS-I cards */
if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {