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UPSTREAM: scsi: ufs-mediatek: add error recovery for suspend and resume

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Once fail happens during suspend and resume flow if the desired low power
link state is H8, link recovery is required for MediaTek UFS controller.

For resume flow, since power and clocks are already enabled before invoking
vendor's resume callback, simply using ufshcd_link_recovery() inside
callback is fine.

For suspend flow, the device power enters low power mode or is disabled
before suspend callback, thus ufshcd_link_recovery() can not be directly
used in vendor callback. One solution is to set the link to off state and
then ufshcd_host_reset_and_restore() will be executed by ufshcd_suspend().

Bug: 151050916
Change-Id: I135c223a30c63e9af714ae3a3bbb950fcc0bd4c2
(cherry picked from commit 8033824bbf3c15e6321045a3f51d6f6947d89d47)
Link: https://lore.kernel.org/r/20200327095329.10083-3-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Stanley Chu 2020-03-27 17:53:29 +08:00 • committed by Greg Kroah-Hartman
commit e854924b25
1 changed files with 11 additions and 2 deletions
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13
drivers/scsi/ufs/ufs-mediatek.c
View file

@ -499,8 +499,15 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_lpm(hba);
if (err)
if (err) {
/*
* Set link as off state enforcedly to trigger
* ufshcd_host_reset_and_restore() in ufshcd_suspend()
* for completed host reset.
*/
ufshcd_set_link_off(hba);
return -EAGAIN;
}
}
if (!ufshcd_is_link_active(hba))
@ -519,8 +526,10 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_hpm(hba);
if (err)
if (err) {
err = ufshcd_link_recovery(hba);
return err;
}
}
return 0;