[PATCH] mmc: dw_mmc-rockchip: Add memory clock auto-gating support

[Ulf Hansson]

On Tue, 4 Nov 2025 at 08:41, Shawn Lin <shawn.lin at rock-chips.com> wrote:
>
> Per design recommendations, the memory clock can be gated when there
> is no in-flight transfer, which helps save power. This feature is
> introduced alongside internal phase support, and this patch enables it.
>
> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
>
>  drivers/mmc/host/dw_mmc-rockchip.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
> index 6813549..62c68cd 100644
> --- a/drivers/mmc/host/dw_mmc-rockchip.c
> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> @@ -19,6 +19,8 @@
>  #define RK3288_CLKGEN_DIV              2
>  #define SDMMC_TIMING_CON0              0x130
>  #define SDMMC_TIMING_CON1              0x134
> +#define SDMMC_MISC_CON                 0x138
> +#define MEM_CLK_AUTOGATE_ENABLE                BIT(5)
>  #define ROCKCHIP_MMC_DELAY_SEL         BIT(10)
>  #define ROCKCHIP_MMC_DEGREE_MASK       0x3
>  #define ROCKCHIP_MMC_DEGREE_OFFSET     1
> @@ -470,6 +472,7 @@ static int dw_mci_rk3576_parse_dt(struct dw_mci *host)
>
>  static int dw_mci_rockchip_init(struct dw_mci *host)
>  {
> +       struct dw_mci_rockchip_priv_data *priv = host->priv;
>         int ret, i;
>
>         /* It is slot 8 on Rockchip SoCs */
> @@ -494,6 +497,9 @@ static int dw_mci_rockchip_init(struct dw_mci *host)
>                         dev_warn(host->dev, "no valid minimum freq: %d\n", ret);
>         }
>
> +       if (priv->internal_phase)
> +               mci_writel(host, MISC_CON, MEM_CLK_AUTOGATE_ENABLE);
> +
>         return 0;
>  }
>
> --
> 2.7.4
>