When the sdhci-cap-speed-modes-broken DT property is set, the driver will ignore the bits of the capability registers that correspond to speed modes and will read the of properties of the device to determine which speeds are supported. Signed-off-by: Zach Brown <zach.brown@xxxxxx> --- drivers/mmc/host/sdhci.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1e25b01..100649a 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -22,6 +22,7 @@ #include <linux/scatterlist.h> #include <linux/regulator/consumer.h> #include <linux/pm_runtime.h> +#include <linux/of.h> #include <linux/leds.h> @@ -3020,6 +3021,32 @@ void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1) } EXPORT_SYMBOL_GPL(__sdhci_read_caps); +void sdhci_get_speed_caps_from_of(struct sdhci_host *host) +{ + struct mmc_host *mmc = host->mmc; + + host->caps &= ~SDHCI_CAN_DO_HISPD; + + if (of_property_read_bool(mmc_dev(mmc)->of_node, "cap-sd-highspeed")) + host->caps |= SDHCI_CAN_DO_HISPD; + + if (host->version < SDHCI_SPEC_300) + return; + + host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 | + SDHCI_SUPPORT_DDR50); + + if (of_property_read_bool(mmc_dev(mmc)->of_node, "sd-uhs-sdr50")) + host->caps1 |= SDHCI_SUPPORT_SDR50; + + if (of_property_read_bool(mmc_dev(mmc)->of_node, "sd-uhs-sdr104")) + host->caps1 |= SDHCI_SUPPORT_SDR104; + + if (of_property_read_bool(mmc_dev(mmc)->of_node, "sd-uhs-ddr50")) + host->caps1 |= SDHCI_SUPPORT_DDR50; + +} + int sdhci_setup_host(struct sdhci_host *host) { struct mmc_host *mmc; @@ -3046,6 +3073,10 @@ int sdhci_setup_host(struct sdhci_host *host) return ret; sdhci_read_caps(host); + if (of_property_read_bool(mmc_dev(mmc)->of_node, + "sdhci-cap-speed-modes-broken")) + sdhci_get_speed_caps_from_of(host); + override_timeout_clk = host->timeout_clk; -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html