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FROMGIT: scsi: ufs: ufs-mediatek: Prevent device regulators setting LPM incorrectly

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Device regulatrs are allowed to enter low-power mode if neither device is
not in active mode, nor VCC does not keep on.

Fix this by adding conditions before LPM decision.

Link: https://lore.kernel.org/r/20220616053725.5681-6-stanley.chu@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 005ffdf09c git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next)
Bug: 239946304
Signed-off-by: Bart Van Assche <bvanassche@google.com>
Change-Id: I927da22710a9c28959e0b452bf64c42524d7ad44
This commit is contained in:
Po-Wen Kao
2022-06-16 13:37:19 +08:00
committed by Treehugger Robot
parent 6396878b40
commit 28ffcf0cc2
1 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/ufs/host/ufs-mediatek.c
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@@ -1034,10 +1034,18 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc)
return;
if (lpm && !hba->vreg_info.vcc->enabled)
/* Bypass LPM when device is still active */
if (lpm && ufshcd_is_ufs_dev_active(hba))
return;
/* Bypass LPM if VCC is enabled */
if (lpm && hba->vreg_info.vcc->enabled)
return;
if (lpm)
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_IDLE);
else if (!lpm)
else
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_NORMAL);
}