From: Subhash Jadavani <subhashj@codeaurora.org>
Date: Fri, 28 Oct 2016 00:26:09 +0000 (-0700)
Subject: scsi: ufs: suspend clock scaling at the start of suspend
X-Git-Tag: v4.10-rc1~128^2~122
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d6fcf81a0d97a9e9f5035973c3a4dc219c9488b0;p=karo-tx-linux.git

scsi: ufs: suspend clock scaling at the start of suspend

Currently clock scaling is suspended only after the host and device are
put in low power mode but we should avoid clock scaling running after
UFS link is put in low power mode (hibern8). This change suspends clock
scaling before putting host/device in low power mode.

Reviewed-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6c0082e2591e..9ed96ae942f6 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5892,6 +5892,8 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	ufshcd_hold(hba, false);
 	hba->clk_gating.is_suspended = true;
 
+	ufshcd_suspend_clkscaling(hba);
+
 	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
 			req_link_state == UIC_LINK_ACTIVE_STATE) {
 		goto disable_clks;
@@ -5899,12 +5901,12 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 
 	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
 	    (req_link_state == hba->uic_link_state))
-		goto out;
+		goto enable_gating;
 
 	/* UFS device & link must be active before we enter in this function */
 	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
 		ret = -EINVAL;
-		goto out;
+		goto enable_gating;
 	}
 
 	if (ufshcd_is_runtime_pm(pm_op)) {
@@ -5940,13 +5942,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	ufshcd_vreg_set_lpm(hba);
 
 disable_clks:
-	/*
-	 * The clock scaling needs access to controller registers. Hence, Wait
-	 * for pending clock scaling work to be done before clocks are
-	 * turned off.
-	 */
-	ufshcd_suspend_clkscaling(hba);
-
 	/*
 	 * Call vendor specific suspend callback. As these callbacks may access
 	 * vendor specific host controller register space call them before the
@@ -5983,6 +5978,7 @@ set_dev_active:
 	if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
 		ufshcd_disable_auto_bkops(hba);
 enable_gating:
+	ufshcd_resume_clkscaling(hba);
 	hba->clk_gating.is_suspended = false;
 	ufshcd_release(hba);
 out: