mmc: mxs-mmc: add broken-cd property

According to bindings documentation for mmc, the property 'broken-cd'
can be used to indicate card-detection is not available and polling
must be used instead. This patch retrieves this property
and sets a custom flag. On the get_cd() hook, it returns 1 if
the flag is set, to always assume the card is present.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index c23188129314915f7bca1af844e2d3b7d9ff96b2..146a53bfab7115be0d7aa72b3efcd46a6ead697e 100644 (file)
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -73,6 +73,7 @@ struct mxs_mmc_host {
        int                             wp_gpio;
        bool                            wp_inverted;
        bool                            cd_inverted;
+       bool                            broken_cd;
        bool                            non_removable;
 };
 
@@ -97,7 +98,7 @@ static int mxs_mmc_get_cd(struct mmc_host *mmc)
        struct mxs_mmc_host *host = mmc_priv(mmc);
        struct mxs_ssp *ssp = &host->ssp;
 
-       return host->non_removable ||
+       return host->non_removable || host->broken_cd ||
                !(readl(ssp->base + HW_SSP_STATUS(ssp)) &
                  BM_SSP_STATUS_CARD_DETECT) ^ host->cd_inverted;
 }
@@ -689,6 +690,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
                mmc->caps |= MMC_CAP_4_BIT_DATA;
        else if (bus_width == 8)
                mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
+       host->broken_cd = of_property_read_bool(np, "broken-cd");
        host->non_removable = of_property_read_bool(np, "non-removable");
        if (host->non_removable)
                mmc->caps |= MMC_CAP_NONREMOVABLE;