On 21 April 2016 at 15:55, Lars Persson <lars.persson@xxxxxxxx> wrote:
> Add a start_signal_voltage_switch() operation to support enabling of
> UHS modes.
>
> Signed-off-by: Lars Persson <larper@xxxxxxxx>
> ---
> drivers/mmc/host/usdhi6rol0.c | 23 ++++++++++++++++++++++-
> 1 file changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
> index 807c06e..28fe5c7 100644
> --- a/drivers/mmc/host/usdhi6rol0.c
> +++ b/drivers/mmc/host/usdhi6rol0.c
> @@ -21,6 +21,7 @@
> #include <linux/mmc/sd.h>
> #include <linux/mmc/sdio.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> #include <linux/pagemap.h>
> #include <linux/platform_device.h>
> #include <linux/scatterlist.h>
> @@ -1147,12 +1148,22 @@ static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable)
> }
> }
>
> +static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> + int ret;
> +
> + ret = mmc_regulator_set_vqmmc(mmc, ios);
> +
> + return ret;
> +}
> +
> static struct mmc_host_ops usdhi6_ops = {
> .request = usdhi6_request,
> .set_ios = usdhi6_set_ios,
> .get_cd = usdhi6_get_cd,
> .get_ro = usdhi6_get_ro,
> .enable_sdio_irq = usdhi6_enable_sdio_irq,
> + .start_signal_voltage_switch = usdhi6_sig_volt_switch,
> };
>
> /* State machine handlers */
> @@ -1785,7 +1796,17 @@ static int usdhi6_probe(struct platform_device *pdev)
>
> mmc->ops = &usdhi6_ops;
> mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
> - MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_DDR50 | MMC_CAP_SDIO_IRQ;
Oh, this was weird. The driver already claimed to support UHS mode,
but when in fact it didn't. :-)
Perhaps that change deserves its own fixup patch?
> + MMC_CAP_SDIO_IRQ;
> +
> + /*
> + * A vqmmc regulator with a 1.8V mode is mandatory to support
> + * UHS modes.
> + */
> + if (!of_property_read_bool(dev->of_node, "no-1-8-v") &&
No, please don't use this binding.
Instead there is already bindings for MMC_CAP_UHS_DDR50 and
MMC_CAP_UHS_SDR50, please use them instead.
> + !IS_ERR(mmc->supply.vqmmc)) {
> + mmc->caps |= MMC_CAP_UHS_DDR50 | MMC_CAP_UHS_SDR50;
> + }
> +
> /* Set .max_segs to some random number. Feel free to adjust. */
> mmc->max_segs = 32;
> mmc->max_blk_size = 512;
> --
> 2.1.4
>
Kind regards
Uffe
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