linux-kernel - [PATCH v2 13/15] scsi: ufs: ufs-qcom: Factor out the logic finding the HS Gear

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Message-Id: <20221031180217.32512-14-manivannan.sadhasivam@linaro.org>
Date:   Mon, 31 Oct 2022 23:32:15 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     martin.petersen@...cle.com, jejb@...ux.ibm.com,
        andersson@...nel.org, vkoul@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     konrad.dybcio@...ainline.org, robh+dt@...nel.org,
        quic_cang@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-scsi@...r.kernel.org,
        dmitry.baryshkov@...aro.org, ahalaney@...hat.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 13/15] scsi: ufs: ufs-qcom: Factor out the logic finding the HS Gear

In the preparation of adding support for new gears, let's move the
logic that finds the gear for each platform to a new function. This helps
with code readability and also allows the logic to be used in other places
of the driver in future.

While at it, let's make it clear that this driver only supports symmetric
gear setting (hs_tx_gear == hs_rx_gear).

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/ufs/host/ufs-qcom.c | 36 +++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 38e2ed749d75..c93d2d38b43e 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -278,6 +278,26 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba)
 	return 0;
 }
 
+static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba, u32 hs_gear)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+	if (host->hw_ver.major == 0x1) {
+		/*
+		 * HS-G3 operations may not reliably work on legacy QCOM
+		 * UFS host controller hardware even though capability
+		 * exchange during link startup phase may end up
+		 * negotiating maximum supported gear as G3.
+		 * Hence downgrade the maximum supported gear to HS-G2.
+		 */
+		if (hs_gear > UFS_HS_G2)
+			return UFS_HS_G2;
+	}
+
+	/* Default is HS-G3 */
+	return UFS_HS_G3;
+}
+
 static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -692,19 +712,9 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
 		ufshcd_init_pwr_dev_param(&ufs_qcom_cap);
 		ufs_qcom_cap.hs_rate = UFS_QCOM_LIMIT_HS_RATE;
 
-		if (host->hw_ver.major == 0x1) {
-			/*
-			 * HS-G3 operations may not reliably work on legacy QCOM
-			 * UFS host controller hardware even though capability
-			 * exchange during link startup phase may end up
-			 * negotiating maximum supported gear as G3.
-			 * Hence downgrade the maximum supported gear to HS-G2.
-			 */
-			if (ufs_qcom_cap.hs_tx_gear > UFS_HS_G2)
-				ufs_qcom_cap.hs_tx_gear = UFS_HS_G2;
-			if (ufs_qcom_cap.hs_rx_gear > UFS_HS_G2)
-				ufs_qcom_cap.hs_rx_gear = UFS_HS_G2;
-		}
+		/* This driver only supports symmetic gear setting i.e., hs_tx_gear == hs_rx_gear */
+		ufs_qcom_cap.hs_tx_gear = ufs_qcom_cap.hs_rx_gear = ufs_qcom_get_hs_gear(hba,
+									ufs_qcom_cap.hs_tx_gear);
 
 		ret = ufshcd_get_pwr_dev_param(&ufs_qcom_cap,
 					       dev_max_params,
-- 
2.25.1