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scsi: ufs: ufs-qcom: Enable Auto Hibern8 clock request support

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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 <mani@kernel.org>
Signed-off-by: Palash Kambar <palash.kambar@oss.qualcomm.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20260423102023.3779489-3-palash.kambar@oss.qualcomm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Palash Kambar 2026-04-23 15:50:23 +05:30 committed by Martin K. Petersen
parent e72323f3b0
commit 76417038c4
2 changed files with 21 additions and 0 deletions
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10
drivers/ufs/host/ufs-qcom.c
View File

@ -705,6 +705,13 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, bool is_pre_scale_up, unsign
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;

11
drivers/ufs/host/ufs-qcom.h
View File

@ -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)