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

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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.

Bug: 151050916
(cherry picked from commit 2a06ff207445ddb7aa643751f85c54e7e3895fb4)
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>
Change-Id: Ie20657f1cd249ff6356d4a51f0d4dc6af1c2dd00
This commit is contained in:
Stanley Chu 2020-01-29 18:52:49 +08:00
commit 9c4239e59e
1 changed files with 7 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

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;