[PATCH/RFC V2 15/16] scsi: ufs: add capability to control the auto bkops during suspend

[Dolev Raviv <draviv@codeaurora.org>]

From: Subhash Jadavani <subhashj@codeaurora.org>

If host explicitly enables the auto bkops (background operation) on device
then only device would perform the bkops on its own. If auto bkops is not
enabled explicitly and if the device reaches to state where it must do
background operation, device would raise the urgent bkops exception event
to host and then host will enable the auto bkops on device. This patch
adds the option to choose whether auto bkops should be enabled during
runtime suspend or not.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6b769d0..d9eb2da 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4704,13 +4704,18 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	}
 
 	if (ufshcd_is_runtime_pm(pm_op)) {
-		/*
-		 * The device is idle with no requests in the queue,
-		 * allow background operations if needed.
-		 */
-		ret = ufshcd_bkops_ctrl(hba, BKOPS_STATUS_NON_CRITICAL);
-		if (ret)
-			goto enable_gating;
+		if (ufshcd_can_autobkops_during_suspend(hba)) {
+			/*
+			 * The device is idle with no requests in the queue,
+			 * allow background operations if needed.
+			 */
+			ret = ufshcd_bkops_ctrl(hba, BKOPS_STATUS_NON_CRITICAL);
+			if (ret)
+				goto enable_gating;
+		} else {
+			/* make sure that auto bkops is disabled */
+			ufshcd_disable_auto_bkops(hba);
+		}
 	}
 
 	if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) &&
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index d5699d0..b94b835 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -466,6 +466,8 @@ struct ufs_hba {
 #define UFSHCD_CAP_HIBERN8_WITH_CLK_GATING (1 << 1)
 	/* Allow dynamic clk scaling */
 #define UFSHCD_CAP_CLK_SCALING	(1 << 2)
+	/* Allow auto bkops to enabled during runtime suspend */
+#define UFSHCD_CAP_AUTO_BKOPS_SUSPEND (1 << 3)
 
 	struct devfreq *devfreq;
 	struct ufs_clk_scaling clk_scaling;
@@ -484,6 +486,11 @@ static inline int ufshcd_is_clkscaling_enabled(struct ufs_hba *hba)
 {
 	return hba->caps & UFSHCD_CAP_CLK_SCALING;
 }
+static inline bool ufshcd_can_autobkops_during_suspend(struct ufs_hba *hba)
+{
+	return hba->caps & UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
+}
+
 #define ufshcd_writel(hba, val, reg)	\
 	writel((val), (hba)->mmio_base + (reg))
 #define ufshcd_readl(hba, reg)	\
-- 
1.8.5.2
-- 
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