On 14/12/17 15:09, Kishon Vijay Abraham I wrote:
> UHS-1 DDR50 and MMC DDR52 mode require DDR bit to be
> set in the configuration register (MMCHS_CON). Add
> sdhci-omap specific set_uhs_signaling ops to set
> this bit. Also while setting the UHSMS bit, clock should be
> disabled.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Apart from 1 minor comment below:
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-omap.c | 26 +++++++++++++++++++++++++-
> 1 file changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index defe4eac020d..8f7239e2edc2 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -31,6 +31,7 @@
> #define SDHCI_OMAP_CON 0x12c
> #define CON_DW8 BIT(5)
> #define CON_DMA_MASTER BIT(20)
> +#define CON_DDR BIT(19)
> #define CON_CLKEXTFREE BIT(16)
> #define CON_PADEN BIT(15)
> #define CON_INIT BIT(1)
> @@ -93,6 +94,9 @@ struct sdhci_omap_host {
> u8 power_mode;
> };
>
> +static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
> +static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);
These forward declarations aren't needed are they.
> +
> static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
> unsigned int offset)
> {
> @@ -471,6 +475,26 @@ static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
> enable_irq(host->irq);
> }
>
> +static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
> + unsigned int timing)
> +{
> + u32 reg;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
> +
> + sdhci_omap_stop_clock(omap_host);
> +
> + reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
> + if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
> + reg |= CON_DDR;
> + else
> + reg &= ~CON_DDR;
> + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
> +
> + sdhci_set_uhs_signaling(host, timing);
> + sdhci_omap_start_clock(omap_host);
> +}
> +
> static struct sdhci_ops sdhci_omap_ops = {
> .set_clock = sdhci_omap_set_clock,
> .set_power = sdhci_omap_set_power,
> @@ -480,7 +504,7 @@ static struct sdhci_ops sdhci_omap_ops = {
> .set_bus_width = sdhci_omap_set_bus_width,
> .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
> .reset = sdhci_reset,
> - .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
> };
>
> static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
>
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