From: Shawn Lin Date: Tue, 4 Nov 2025 07:41:34 +0000 (+0800) Subject: mmc: dw_mmc-rockchip: Add memory clock auto-gating support X-Git-Tag: v6.19-rc1~144^2~18 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff6f0286c896f062853552097220dd93961be9c4;p=thirdparty%2Fkernel%2Flinux.git mmc: dw_mmc-rockchip: Add memory clock auto-gating support 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 Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c index 681354942e974..62c68cda1e214 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; }