linux-kernel - [PATCH V6 6/6] scsi: ufs: qcom: Configure clk HW division based on scaling conditions.

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Message-Id: <20230901114242.31219-7-quic_nitirawa@quicinc.com>
Date:   Fri,  1 Sep 2023 17:12:42 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     mani@...nel.org, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     quic_cang@...cinc.com, quic_nguyenb@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Nitin Rawat <quic_nitirawa@...cinc.com>,
        Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Subject: [PATCH V6 6/6] scsi: ufs: qcom: Configure clk HW division based on scaling conditions.

a) Enable internal HW division of unipro core_clk for scale up condition.
b) Clear internal HW division of unipro core_clk for scale down condition.

Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
---
 drivers/ufs/host/ufs-qcom.c | 31 +++++++++++++++++--------------
 drivers/ufs/host/ufs-qcom.h |  2 +-
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index c251c98a74f0..2ddda9356abc 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1389,18 +1389,21 @@ static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba,
 		core_clk_ctrl_reg |= FIELD_PREP(CLK_1US_CYCLES_MASK, cycles_in_1us);
 	}

-	/* Clear CORE_CLK_DIV_EN */
-	core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
+	/* Enable CORE_CLK_DIV_EN for scale up condition */
+	if (is_max_freq)
+		core_clk_ctrl_reg |= CORE_CLK_DIV_EN_BIT;

 	ret = ufshcd_dme_set(hba,
 			    UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
 			    core_clk_ctrl_reg);
+	if (ret)
+		return ret;
 	/*
 	 * UFS host controller V4.0.0 onwards needs to program
 	 * PA_VS_CORE_CLK_40NS_CYCLES attribute per programmed
 	 * frequency of unipro core clk of UFS host controller.
 	 */
-	if (!ret && (host->hw_ver.major >= 4)) {
+	if (host->hw_ver.major >= 4) {
 		if (cycles_in_40ns > PA_VS_CORE_CLK_40NS_CYCLES_MASK)
 			return -EINVAL;

@@ -1451,26 +1454,26 @@ static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
 static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
-	int err;
-	u32 core_clk_ctrl_reg;
+	int ret;
+	u32 reg;

 	if (!ufs_qcom_cap_qunipro(host))
 		return 0;

-	err = ufshcd_dme_get(hba,
+	ret = ufshcd_dme_get(hba,
 			    UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
-			    &core_clk_ctrl_reg);
+			    &reg);
+	if (ret)
+		return ret;

 	/* make sure CORE_CLK_DIV_EN is cleared */
-	if (!err &&
-	    (core_clk_ctrl_reg & DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT)) {
-		core_clk_ctrl_reg &= ~DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT;
-		err = ufshcd_dme_set(hba,
+	if (reg & CORE_CLK_DIV_EN_BIT) {
+		reg &= ~CORE_CLK_DIV_EN_BIT;
+		ret = ufshcd_dme_set(hba,
 				    UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
-				    core_clk_ctrl_reg);
+				    reg);
 	}
-
-	return err;
+	return ret;
 }

 static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba)
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index bc176ef58e3e..bf0c370c79c7 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -141,7 +141,7 @@ enum {
 /* bit and mask definitions for DME_VS_CORE_CLK_CTRL attribute */
 #define CLK_1US_CYCLES_MASK_V4				GENMASK(27, 16)
 #define CLK_1US_CYCLES_MASK				GENMASK(7, 0)
-#define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT	BIT(8)
+#define CORE_CLK_DIV_EN_BIT				BIT(8)
 #define PA_VS_CORE_CLK_40NS_CYCLES			0x9007
 #define PA_VS_CORE_CLK_40NS_CYCLES_MASK			GENMASK(6, 0)

--
2.17.1