On 12/10/16 21:40, Zach Brown wrote: > When the broken-highspeed property is set the sdhci driver will not > go into highspeed mode even if the controller and card appear to > otherwise support highspeed mode. > > This is useful in cases where the controller and card support highspeed, > but the board configuration or some other issue make highspeed > impossible. For example, we send the SDIO lines through a fpga so we > need the data to change on the falling edge of the clock or there will > be issues with hold time. > > Signed-off-by: Zach Brown <zach.brown@xxxxxx> Assuming the DT property is accepted: Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > --- > drivers/mmc/host/sdhci.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index 4805566..17e6c50 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> > > @@ -3274,7 +3275,8 @@ int sdhci_setup_host(struct sdhci_host *host) > if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23) > mmc->caps &= ~MMC_CAP_CMD23; > > - if (host->caps & SDHCI_CAN_DO_HISPD) > + if ((host->caps & SDHCI_CAN_DO_HISPD) && > + !(of_property_read_bool(mmc_dev(mmc)->of_node, "broken-highspeed"))) > mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; > > if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && > -- 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
