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| author | Adrian Hunter <adrian.hunter@intel.com> | 2022-08-15 10:33:21 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2022-08-22 12:58:28 +0200 |
| commit | 63f1560930e4e1c4f6279b8ae715c9841fe1a6d3 (patch) | |
| tree | 18088e0fecec806d1d13deb0424d642826f3da78 /drivers/mmc | |
| parent | 15c56208c79c340686869c31595c209d1431c5e8 (diff) | |
| download | linux-rpi-63f1560930e4e1c4f6279b8ae715c9841fe1a6d3.tar.gz linux-rpi-63f1560930e4e1c4f6279b8ae715c9841fe1a6d3.tar.bz2 linux-rpi-63f1560930e4e1c4f6279b8ae715c9841fe1a6d3.zip | |
mmc: core: Fix inconsistent sd3_bus_mode at UHS-I SD voltage switch failure
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/sd.c | 42 |
1 files changed, 16 insertions, 26 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index bc84d7dfc8e1..06aa62ce0ed1 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -949,16 +949,17 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, /* Erase init depends on CSD and SSR */ mmc_init_erase(card); - - /* - * Fetch switch information from card. - */ - err = mmc_read_switch(card); - if (err) - return err; } /* + * 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); + if (err) + return err; + + /* * For SPI, enable CRC as appropriate. * This CRC enable is located AFTER the reading of the * card registers because some SDHC cards are not able @@ -1480,26 +1481,15 @@ retry: if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && mmc_sd_card_using_v18(card) && 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) || - mmc_sd_init_uhs_card(card)) { - v18_fixup_failed = true; - mmc_power_cycle(host, ocr); - if (!oldcard) - mmc_remove_card(card); - goto retry; - } - goto cont; + if (mmc_host_set_uhs_voltage(host) || + mmc_sd_init_uhs_card(card)) { + v18_fixup_failed = true; + mmc_power_cycle(host, ocr); + if (!oldcard) + mmc_remove_card(card); + goto retry; } + goto cont; } /* Initialization sequence for UHS-I cards */ |