[PATCH v3 2/4] scsi: ufs-mediatek: support linkoff state during suspend

Stanley Chu
2020-01-29T07:49:50Z

If system suspend or runtime suspend mode is configured as
linkoff state, phy can be powered off and reference clock
can be gated in MediaTek Chipsets.

In the same time, remove redundant reference clock control
in suspend and resume callbacks because such control can be
well-handled in setup_clocks callback..

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufs-mediatek.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 7ac838cc15d1..d78897a14905 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -167,7 +167,7 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,

switch (status) {
case PRE_CHANGE:
- if (!on) {
+ if (!on && !ufshcd_is_link_active(hba)) {
ufs_mtk_setup_ref_clk(hba, on);
ret = phy_power_off(host->mphy);
}
@@ -437,10 +437,11 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
err = ufs_mtk_link_set_lpm(hba);
if (err)
return -EAGAIN;
- phy_power_off(host->mphy);
- ufs_mtk_setup_ref_clk(hba, false);
}

+ if (!ufshcd_is_link_active(hba))
+ phy_power_off(host->mphy);
+
return 0;
}

@@ -449,9 +450,10 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
int err;

- if (ufshcd_is_link_hibern8(hba)) {
- ufs_mtk_setup_ref_clk(hba, true);
+ if (!ufshcd_is_link_active(hba))
phy_power_on(host->mphy);
+
+ if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_hpm(hba);
if (err)
return err;