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scsi: ufs: host: mediatek: Disable auto-hibern8 during power mode changes

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Disable auto-hibern8 during power mode transitions to prevent unintended
entry into auto-hibern8. Restore the original auto-hibern8 timer value
after completing the power mode change to maintain system stability and
prevent potential issues during power state transitions.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Wang 2025-09-03 10:44:42 +08:00 committed by Martin K. Petersen
parent c73cd5e298
commit f5ca8d0c7a
1 changed files with 30 additions and 23 deletions
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53
drivers/ufs/host/ufs-mediatek.c
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@ -1429,19 +1429,49 @@ static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
return ret; return ret;
} }
static int ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
{
int ret;
/* disable auto-hibern8 */
ufshcd_writel(hba, 0, REG_AUTO_HIBERNATE_IDLE_TIMER);
/* wait host return to idle state when auto-hibern8 off */
ufs_mtk_wait_idle_state(hba, 5);
ret = ufs_mtk_wait_link_state(hba, VS_LINK_UP, 100);
if (ret) {
dev_warn(hba->dev, "exit h8 state fail, ret=%d\n", ret);
ufshcd_force_error_recovery(hba);
/* trigger error handler and break suspend */
ret = -EBUSY;
}
return ret;
}
static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba, static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba,
enum ufs_notify_change_status stage, enum ufs_notify_change_status stage,
const struct ufs_pa_layer_attr *dev_max_params, const struct ufs_pa_layer_attr *dev_max_params,
struct ufs_pa_layer_attr *dev_req_params) struct ufs_pa_layer_attr *dev_req_params)
{ {
int ret = 0; int ret = 0;
static u32 reg;
switch (stage) { switch (stage) {
case PRE_CHANGE: case PRE_CHANGE:
if (ufshcd_is_auto_hibern8_supported(hba)) {
reg = ufshcd_readl(hba, REG_AUTO_HIBERNATE_IDLE_TIMER);
ufs_mtk_auto_hibern8_disable(hba);
}
ret = ufs_mtk_pre_pwr_change(hba, dev_max_params, ret = ufs_mtk_pre_pwr_change(hba, dev_max_params,
dev_req_params); dev_req_params);
break; break;
case POST_CHANGE: case POST_CHANGE:
if (ufshcd_is_auto_hibern8_supported(hba))
ufshcd_writel(hba, reg, REG_AUTO_HIBERNATE_IDLE_TIMER);
break; break;
default: default:
ret = -EINVAL; ret = -EINVAL;
@ -1686,29 +1716,6 @@ static void ufs_mtk_dev_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
} }
} }
static int ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
{
int ret;
/* disable auto-hibern8 */
ufshcd_writel(hba, 0, REG_AUTO_HIBERNATE_IDLE_TIMER);
/* wait host return to idle state when auto-hibern8 off */
ufs_mtk_wait_idle_state(hba, 5);
ret = ufs_mtk_wait_link_state(hba, VS_LINK_UP, 100);
if (ret) {
dev_warn(hba->dev, "exit h8 state fail, ret=%d\n", ret);
ufshcd_force_error_recovery(hba);
/* trigger error handler and break suspend */
ret = -EBUSY;
}
return ret;
}
static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op, static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
enum ufs_notify_change_status status) enum ufs_notify_change_status status)
{ {