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@xxxxxxxxxxx> --- Changes since v2: - As suggested by Adrian Hunter, keep the argument of sdhci_check_ro() as it is: a "struct sdhci_host*" Changes since v1: - As suggested by Adrian Hunter, call the ->get_ro() if it exists before falling back to using mmc_gpio_get_ro(). Indeed, if the controller-specific code has implemented a ->get_ro() callback, it should take precedence over what the SDHCI core does. Due to this change, I have not added Thierry Redding Reviewed-by. - Fix typo in the commit log noticed by Thierry Redding. --- drivers/mmc/host/sdhci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index df05352b6a4a..b3444d12c8c8 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2033,6 +2033,8 @@ 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); -- 2.20.1
