5.4-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Hunter adrian.hunter@intel.com
commit fbd64f902b93fe9658b855b9892ae59ef6ea22b9 upstream.
mmc_of_parse() reads device property "wp-inverted" and sets MMC_CAP2_RO_ACTIVE_HIGH if it is true. MMC_CAP2_RO_ACTIVE_HIGH is used to invert a write-protect (AKA read-only) GPIO value.
sdhci_get_property() also reads "wp-inverted" and sets SDHCI_QUIRK_INVERTED_WRITE_PROTECT which is used to invert the write-protect value as well but also acts upon a value read out from the SDHCI_PRESENT_STATE register.
Many drivers call both mmc_of_parse() and sdhci_get_property(), so that both MMC_CAP2_RO_ACTIVE_HIGH and SDHCI_QUIRK_INVERTED_WRITE_PROTECT will be set if the controller has device property "wp-inverted".
Amend the logic in sdhci_check_ro() to allow for that possibility, so that the write-protect value is not inverted twice.
Also do not invert the value if it is a negative error value. Note that callers treat an error the same as not-write-protected, so the result is functionally the same in that case.
Also do not invert the value if sdhci host operation ->get_ro() is used. None of the users of that callback set SDHCI_QUIRK_INVERTED_WRITE_PROTECT directly or indirectly, but two do call mmc_gpio_get_ro(), so leave it to them to deal with that if they ever set SDHCI_QUIRK_INVERTED_WRITE_PROTECT in the future.
Fixes: 6d5cd068ee59 ("mmc: sdhci: use WP GPIO in sdhci_check_ro()") Signed-off-by: Adrian Hunter adrian.hunter@intel.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240614080051.4005-2-adrian.hunter@intel.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/sdhci.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-)
--- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2141,26 +2141,34 @@ static int sdhci_get_cd(struct mmc_host
static int sdhci_check_ro(struct sdhci_host *host) { + bool allow_invert = false; unsigned long flags; int is_readonly;
spin_lock_irqsave(&host->lock, flags);
- if (host->flags & SDHCI_DEVICE_DEAD) + if (host->flags & SDHCI_DEVICE_DEAD) { is_readonly = 0; - else if (host->ops->get_ro) + } else if (host->ops->get_ro) { is_readonly = host->ops->get_ro(host); - else if (mmc_can_gpio_ro(host->mmc)) + } else if (mmc_can_gpio_ro(host->mmc)) { is_readonly = mmc_gpio_get_ro(host->mmc); - else + /* Do not invert twice */ + allow_invert = !(host->mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH); + } else { is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_WRITE_PROTECT); + allow_invert = true; + }
spin_unlock_irqrestore(&host->lock, flags);
- /* This quirk needs to be replaced by a callback-function later */ - return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ? - !is_readonly : is_readonly; + if (is_readonly >= 0 && + allow_invert && + (host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT)) + is_readonly = !is_readonly; + + return is_readonly; }
#define SAMPLE_COUNT 5