Re: [PATCH v2] scsi: ufs: fix clkgating on/off correctly

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On 2020-10-17 05:18, jaegeuk@xxxxxxxxxx wrote:
The below call stack prevents clk_gating at every IO completion.
We can remove the condition, ufshcd_any_tag_in_use(), since clkgating_work
will check it again.

Thanks for fixing it, actually we have noticed this for a while.
It used to work well, please add a Fixes tag or mention the commit
which breaks clk gating functionality - the commit which introduces
func ufshcd_any_tag_in_use().

Regards,

Can Guo.


ufshcd_complete_requests(struct ufs_hba *hba)
  ufshcd_transfer_req_compl()
    __ufshcd_transfer_req_compl()
      __ufshcd_release(hba)
        if (ufshcd_any_tag_in_use() == 1)
           return;
  ufshcd_tmc_handler(hba);
    blk_mq_tagset_busy_iter();

In addition, we have to avoid gate_work, if it was disabled.

Cc: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Cc: Avri Altman <avri.altman@xxxxxxx>
Cc: Can Guo <cang@xxxxxxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---

Change log from v1:
 - change the patch subject
 - fix clkgate.is_enable to work

 drivers/scsi/ufs/ufshcd.c | 5 +++--
 drivers/scsi/ufs/ufshcd.h | 5 +++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a2db8182663d..75e8a76f20c7 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1729,9 +1729,10 @@ static void __ufshcd_release(struct ufs_hba *hba)

 	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
 		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
-		|| ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks
+		|| hba->outstanding_tasks
 		|| hba->active_uic_cmd || hba->uic_async_done
-		|| ufshcd_eh_in_progress(hba))
+		|| ufshcd_eh_in_progress(hba)
+		|| ufshcd_is_clkgating_enabled(hba))
 		return;

 	hba->clk_gating.state = REQ_CLKS_OFF;
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 8344d8cb3678..09e59cb86e69 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -814,6 +814,11 @@ static inline bool
ufshcd_is_auto_hibern8_supported(struct ufs_hba *hba)
 		!(hba->quirks & UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8);
 }

+static inline bool ufshcd_is_clkgating_enabled(struct ufs_hba *hba)
+{
+	return hba->clk_gating.is_enabled;
+}
+
 static inline bool ufshcd_is_auto_hibern8_enabled(struct ufs_hba *hba)
 {
return FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, hba->ahit) ? true : false;



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