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Commit ab9fa23b authored by Subhash Jadavani's avatar Subhash Jadavani
Browse files

scsi: ufs: add capability to control the auto bkops during suspend 



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.

Change-Id: Ib725ad08d5d810a1251c8ae5009504b33b9fcab8
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent cdd91404

drivers/scsi/ufs/ufshcd.c

+12 −7
Original line number Diff line number Diff line
@@ -5370,6 +5370,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) 
	}



	if (ufshcd_is_runtime_pm(pm_op)) {

		if (ufshcd_can_autobkops_during_suspend(hba)) {

			/*

			 * The device is idle with no requests in the queue,

			 * allow background operations if needed.
@@ -5377,6 +5378,10 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) 
			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) &&

drivers/scsi/ufs/ufshcd.h

+7 −0
Original line number Diff line number Diff line
@@ -541,6 +541,8 @@ 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;
@@ -566,6 +568,11 @@ 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)	\