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This > causes mmc_select_timing() to skip mmc_select_hs(), leaving eMMC > in legacy mode (26MHz) instead of High Speed SDR (52MHz). > > Per JEDEC eMMC spec section 5.3.2, 1-bit mode supports High Speed > SDR. Drop incompatible HS200/HS400/UHS/DDR caps early so timing > selection falls through to mmc_select_hs() correctly. > Fixes: f2119df6b7646 ("mmc: sd: add support for signal voltage switch procedure") > Signed-off-by: Luke Wang > --- > drivers/mmc/host/sdhci.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index b1a3cd574c84..3e163f14a640 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -4539,8 +4539,14 @@ int sdhci_setup_host(struct sdhci_host *host) > * their platform code before calling sdhci_add_host(), and we > * won't assume 8-bit width for hosts without that CAP. > */ > - if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) > + if (host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA) { > + host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | > + SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_HS400); SDHCI_SUPPORT_HS400 is non-standard. Hence the check for SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 is needed: host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50); if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400) host->caps1 &= ~SDHCI_SUPPORT_HS400; > + mmc->caps2 &= ~(MMC_CAP2_HS200 | MMC_CAP2_HS400 | MMC_CAP2_HS400_ES); > + mmc->caps &= ~(MMC_CAP_DDR | MMC_CAP_UHS); > + } else { > mmc->caps |= MMC_CAP_4_BIT_DATA; > + } > > if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) > mmc->caps &= ~MMC_CAP_CMD23;