From: Palash Kambar Date: Thu, 23 Apr 2026 10:20:23 +0000 (+0530) Subject: scsi: ufs: ufs-qcom: Enable Auto Hibern8 clock request support X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76417038c4d61fc3d407625c0b9332942f13e142;p=thirdparty%2Fkernel%2Flinux.git scsi: ufs: ufs-qcom: Enable Auto Hibern8 clock request support On platforms that support Auto Hibern8 (AH8), the UFS controller can autonomously de-assert clk_req signals to the Global Clock Controller when entering the Hibern8 state. This allows Global Clock Controller (GCC) to gate unused clocks, improving power efficiency. Enable the Clock Request feature by setting the UFS_HW_CLK_CTRL_EN bit in the UFS_AH8_CFG register, as recommended in the Hardware Programming Guidelines. Reviewed-by: Manivannan Sadhasivam Signed-off-by: Palash Kambar Reviewed-by: Bart Van Assche Link: https://patch.msgid.link/20260423102023.3779489-3-palash.kambar@oss.qualcomm.com Signed-off-by: Martin K. Petersen --- diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c index bc037db46624..c084ccc72523 100644 --- a/drivers/ufs/host/ufs-qcom.c +++ b/drivers/ufs/host/ufs-qcom.c @@ -705,6 +705,13 @@ cfg_timers: return 0; } +static void ufs_qcom_link_startup_post_change(struct ufs_hba *hba) +{ + if (ufshcd_is_auto_hibern8_supported(hba)) + ufshcd_rmwl(hba, UFS_HW_CLK_CTRL_EN, UFS_HW_CLK_CTRL_EN, + UFS_AH8_CFG); +} + static int ufs_qcom_link_startup_notify(struct ufs_hba *hba, enum ufs_notify_change_status status) { @@ -730,6 +737,9 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba, */ err = ufshcd_disable_host_tx_lcc(hba); + break; + case POST_CHANGE: + ufs_qcom_link_startup_post_change(hba); break; default: break; diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h index 5d083331a7f4..e20b3ca50577 100644 --- a/drivers/ufs/host/ufs-qcom.h +++ b/drivers/ufs/host/ufs-qcom.h @@ -268,6 +268,17 @@ enum { */ #define NUM_TX_R1W1 13 +/* bit definitions for UFS_AH8_CFG register */ +#define CC_UFS_SYS_CLK_REQ_EN BIT(2) +#define CC_UFS_ICE_CORE_CLK_REQ_EN BIT(3) +#define CC_UFS_UNIPRO_CORE_CLK_REQ_EN BIT(4) +#define CC_UFS_AUXCLK_REQ_EN BIT(5) + +#define UFS_HW_CLK_CTRL_EN (CC_UFS_SYS_CLK_REQ_EN |\ + CC_UFS_ICE_CORE_CLK_REQ_EN |\ + CC_UFS_UNIPRO_CORE_CLK_REQ_EN |\ + CC_UFS_AUXCLK_REQ_EN) + static inline void ufs_qcom_get_controller_revision(struct ufs_hba *hba, u8 *major, u16 *minor, u16 *step)