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FROMGIT: scsi: ufs: ufs-mediatek: Fix power down spec violation

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As per spec, e.g. JESD220E chapter 7.2, while powering off the UFS device,
RST_N signal should be between VSS(Ground) and VCCQ/VCCQ2. The power down
sequence after fixing:

Power down:

 1. Assert RST_N low

 2. Turn-off VCC

 3. Turn-off VCCQ/VCCQ2

Bug: 188004633
Change-Id: I902935f5bb987d1cf3b80170cc9eb866de44bc13
(cherry picked from commit c625b80b9d
 https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git scsi-fixes)
Link: https://lore.kernel.org/r/1620813706-25331-1-git-send-email-peter.wang@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
This commit is contained in:
Peter Wang 2021-05-12 18:01:45 +08:00 committed by Greg Kroah-Hartman
parent b5b3246504
commit 560fdb20e4
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/ufs/ufs-mediatek.c
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@ -916,6 +916,7 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{ {
int err; int err;
struct arm_smccc_res res;
if (ufshcd_is_link_hibern8(hba)) { if (ufshcd_is_link_hibern8(hba)) {
err = ufs_mtk_link_set_lpm(hba); err = ufs_mtk_link_set_lpm(hba);
@ -935,6 +936,9 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
goto fail; goto fail;
} }
if (ufshcd_is_link_off(hba))
ufs_mtk_device_reset_ctrl(0, res);
return 0; return 0;
fail: fail:
/* /*