From 6d55af0f0740bf3d77943425fdafb77dc0fa6bb9 Mon Sep 17 00:00:00 2001 From: Bharat Uppal Date: Thu, 21 Aug 2025 11:09:23 +0530 Subject: [PATCH] scsi: ufs: exynos: fsd: Gate ref_clk and put UFS device in reset on suspend On FSD platform, gating the reference clock (ref_clk) and putting the UFS device in reset by asserting the reset signal during UFS suspend, improves the power savings and ensures the PHY is fully turned off. These operations are added as FSD specific suspend hook to avoid unintended side effects on other SoCs supported by this driver. Co-developed-by: Nimesh Sati Signed-off-by: Nimesh Sati Signed-off-by: Bharat Uppal Link: https://lore.kernel.org/r/20250821053923.69411-1-bharat.uppal@samsung.com Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- drivers/ufs/host/ufs-exynos.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c index f0adcd9dd553..513cbcfa10ac 100644 --- a/drivers/ufs/host/ufs-exynos.c +++ b/drivers/ufs/host/ufs-exynos.c @@ -1896,6 +1896,13 @@ static int fsd_ufs_pre_pwr_change(struct exynos_ufs *ufs, return 0; } +static int fsd_ufs_suspend(struct exynos_ufs *ufs) +{ + exynos_ufs_gate_clks(ufs); + hci_writel(ufs, 0, HCI_GPIO_OUT); + return 0; +} + static inline u32 get_mclk_period_unipro_18(struct exynos_ufs *ufs) { return (16 * 1000 * 1000000UL / ufs->mclk_rate); @@ -2162,6 +2169,7 @@ static const struct exynos_ufs_drv_data fsd_ufs_drvs = { .pre_link = fsd_ufs_pre_link, .post_link = fsd_ufs_post_link, .pre_pwr_change = fsd_ufs_pre_pwr_change, + .suspend = fsd_ufs_suspend, }; static const struct exynos_ufs_drv_data gs101_ufs_drvs = { -- 2.47.3