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authorThomas Petazzoni <thomas.petazzoni@bootlin.com>2019-02-12 15:07:35 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2019-02-25 08:40:58 +0100
commit6d5cd068ee59fba58f49bed2fcea3634bc22f4b3 (patch)
treef4f3276a56b4be29ed3d516506263aa8c6c9ef1e /drivers/mmc
parent70bcc9e3a8cc943292450559a2774b1a3f104851 (diff)
downloadlinux-6d5cd068ee59fba58f49bed2fcea3634bc22f4b3.tar.bz2
mmc: sdhci: use WP GPIO in sdhci_check_ro()
Even though SDHCI controllers may have a dedicated WP pin that can be queried using the SDHCI_PRESENT_STATE register, some platforms may chose to use a separate regular GPIO to route the WP signal. Such a GPIO is typically represented using the wp-gpios property in the Device Tree. Unfortunately, the current sdhci_check_ro() function does not make use of such GPIO when available: it either uses a host controller specific ->get_ro() operation, or uses the SDHCI_PRESENT_STATE. Several host controller specific ->get_ro() functions are implemented just to check a WP GPIO state. Instead of pushing this to more controller-specific implementations, let's handle this in the core SDHCI code, just like it is already done for the CD GPIO in sdhci_get_cd(). The below patch simply changes sdhci_check_ro() to use the value of the WP GPIO if available. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 39bbbd754781..a8141ff9be03 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2053,6 +2053,8 @@ static int sdhci_check_ro(struct sdhci_host *host)
is_readonly = 0;
else if (host->ops->get_ro)
is_readonly = host->ops->get_ro(host);
+ else if (mmc_can_gpio_ro(host->mmc))
+ is_readonly = mmc_gpio_get_ro(host->mmc);
else
is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
& SDHCI_WRITE_PROTECT);