linux-kernel - [PATCH 5.7 094/124] scsi: ufs: Add quirk to disallow reset of interrupt aggregation

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Message-Id: <20200824082414.030173227@linuxfoundation.org>
Date:   Mon, 24 Aug 2020 10:30:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Avri Altman <avri.altman@....com>,
        Seungwon Jeon <essuuj@...il.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 094/124] scsi: ufs: Add quirk to disallow reset of interrupt aggregation

From: Alim Akhtar <alim.akhtar@...sung.com>

[ Upstream commit b638b5eb624bd5d0766683b6181d578f414585e9 ]

Some host controllers support interrupt aggregation but don't allow
resetting counter and timer in software.

Link: https://lore.kernel.org/r/20200528011658.71590-3-alim.akhtar@samsung.com
Reviewed-by: Avri Altman <avri.altman@....com>
Signed-off-by: Seungwon Jeon <essuuj@...il.com>
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ufs/ufshcd.c | 3 ++-
 drivers/scsi/ufs/ufshcd.h | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9e31f9569bf78..acd8fb4981142 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4889,7 +4889,8 @@ static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
 	 * false interrupt if device completes another request after resetting
 	 * aggregation and before reading the DB.
 	 */
-	if (ufshcd_is_intr_aggr_allowed(hba))
+	if (ufshcd_is_intr_aggr_allowed(hba) &&
+	    !(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
 		ufshcd_reset_intr_aggr(hba);
 
 	tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index ceadbd548e06d..5b1acdd83d5c1 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -523,6 +523,12 @@ enum ufshcd_quirks {
 	 * Clear handling for transfer/task request list is just opposite.
 	 */
 	UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR		= 1 << 6,
+
+	/*
+	 * This quirk needs to be enabled if host controller doesn't allow
+	 * that the interrupt aggregation timer and counter are reset by s/w.
+	 */
+	UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR		= 1 << 7,
 };
 
 enum ufshcd_caps {
-- 
2.25.1