From 7fff2d4a925f15e0a96a3b9d3d0e4b97c58732e7 Mon Sep 17 00:00:00 2001 From: Stanley Chu Date: Mon, 25 Jan 2021 07:16:24 +0000 Subject: [PATCH] scsi: ufs: Fix possible power drain during system suspend stable inclusion from stable-5.10.9 commit 4351cf25cb5204c13d5edfa5074417c6988b5ce6 bugzilla: 47457 -------------------------------- commit 1d53864c3617f5235f891ca0fbe9347c4cd35d46 upstream. Currently if device needs to do flush or BKOP operations, the device VCC power is kept during runtime-suspend period. However, if system suspend is happening while device is runtime-suspended, such power may not be disabled successfully. The reasons may be, 1. If current PM level is the same as SPM level, device will keep runtime-suspended by ufshcd_system_suspend(). 2. Flush recheck work may not be scheduled successfully during system suspend period. If it can wake up the system, this is also not the intention of the recheck work. To fix this issue, simply runtime-resume the device if the flush is allowed during runtime suspend period. Flush capability will be disabled while leaving runtime suspend, and also not be allowed in system suspend period. Link: https://lore.kernel.org/r/20201222072905.32221-2-stanley.chu@mediatek.com Fixes: 51dd905bd2f6 ("scsi: ufs: Fix WriteBooster flush during runtime suspend") Reviewed-by: Chaotian Jing Reviewed-by: Can Guo Signed-off-by: Stanley Chu Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chen Jun Acked-by: Xie XiuQi --- drivers/scsi/ufs/ufshcd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 7558b4abebfc..7b9a9a771b11 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -8818,7 +8818,8 @@ int ufshcd_system_suspend(struct ufs_hba *hba) if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) == hba->curr_dev_pwr_mode) && (ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) == - hba->uic_link_state)) + hba->uic_link_state) && + !hba->dev_info.b_rpm_dev_flush_capable) goto out; if (pm_runtime_suspended(hba->dev)) { -- GitLab