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scsi: ufs: ufs-mediatek: support linkoff state during suspend 

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.

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

Link: https://lore.kernel.org/r/20200129105251.12466-3-stanley.chu@mediatek.com
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
alistair/sensors
Stanley Chu 2020-01-29 18:52:49 +08:00 committed by Martin K. Petersen
parent 7742ca797a
commit 2a06ff2074
1 changed files with 7 additions and 5 deletions
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12
drivers/scsi/ufs/ufs-mediatek.c
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@ -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;