linux-kernel - [PATCH AUTOSEL 6.8 08/98] scsi: ufs: qcom: Avoid re-init quirk when gears match

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Message-ID: <20240329123919.3087149-8-sashal@kernel.org>
Date: Fri, 29 Mar 2024 08:36:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Eric Chanudet <echanude@...hat.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Andrew Halaney <ahalaney@...hat.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	andersson@...nel.org,
	konrad.dybcio@...aro.org,
	jejb@...ux.ibm.com,
	linux-arm-msm@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.8 08/98] scsi: ufs: qcom: Avoid re-init quirk when gears match

From: Eric Chanudet <echanude@...hat.com>

[ Upstream commit 10a39667a117daf0c1baaebcbe589715ee79178b ]

On sa8775p-ride, probing the HBA will go through the
UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH path although the power info is
the same during the second init.

The REINIT quirk only applies starting with controller v4. For these,
ufs_qcom_get_hs_gear() reads the highest supported gear when setting the
host_params. After the negotiation, if the host and device are on the same
gear, it is the highest gear supported between the two. Skip REINIT to save
some time.

Signed-off-by: Eric Chanudet <echanude@...hat.com>
Link: https://lore.kernel.org/r/20240123192854.1724905-4-echanude@redhat.com
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Tested-by: Andrew Halaney <ahalaney@...hat.com> # sa8775p-ride
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/ufs/host/ufs-qcom.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 39eef470f8fa5..f7dba7236c6e5 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -738,8 +738,17 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
 		 * the second init can program the optimal PHY settings. This allows one to start
 		 * the first init with either the minimum or the maximum support gear.
 		 */
-		if (hba->ufshcd_state == UFSHCD_STATE_RESET)
-			host->phy_gear = dev_req_params->gear_tx;
+		if (hba->ufshcd_state == UFSHCD_STATE_RESET) {
+			/*
+			 * Skip REINIT if the negotiated gear matches with the
+			 * initial phy_gear. Otherwise, update the phy_gear to
+			 * program the optimal gear setting during REINIT.
+			 */
+			if (host->phy_gear == dev_req_params->gear_tx)
+				hba->quirks &= ~UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH;
+			else
+				host->phy_gear = dev_req_params->gear_tx;
+		}
 
 		/* enable the device ref clock before changing to HS mode */
 		if (!ufshcd_is_hs_mode(&hba->pwr_info) &&
-- 
2.43.0