[PATCH v3 1/3] scsi: ufs: qcom: Check gear against max gear in vop freq_to_gear()

[PATCH v3 1/3] scsi: ufs: qcom: Check gear against max gear in vop freq_to_gear()

[Ziqi Chen]

The vop freq_to_gear() may return a gear greater than the negotiated max
gear, return the negotiated max gear if the mapped gear is greater than it.

Fixes: c02fe9e222d1 ("scsi: ufs: qcom: Implement the freq_to_gear_speed() vop")
Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Bean Huo <beanhuo@micron.com>

---
v1 -> v2:
1. Instead of return 'gear', return '0' directly if didn't find mapped
   gear
2. Derectly return min_t(gear,max_gear) instead assign to 'gear' then
   return it.

v2 -> v3:
Replace hard code '0' with enum 'UFS_HS_DONT_CHANGE'.
---
 drivers/ufs/host/ufs-qcom.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 790da25cbaf3..654d970b6dec 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -2083,7 +2083,7 @@ static int ufs_qcom_config_esi(struct ufs_hba *hba)
 
 static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
 {
-	u32 gear = 0;
+	u32 gear = UFS_HS_DONT_CHANGE;
 
 	switch (freq) {
 	case 403000000:
@@ -2105,10 +2105,10 @@ static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
 		break;
 	default:
 		dev_err(hba->dev, "%s: Unsupported clock freq : %lu\n", __func__, freq);
-		break;
+		return UFS_HS_DONT_CHANGE;
 	}
 
-	return gear;
+	return min_t(u32, gear, hba->max_pwr_info.info.gear_rx);
 }
 
 /*
-- 
2.34.1

[PATCH v3 2/3] scsi: ufs: qcom: Map devfreq OPP freq to UniPro Core Clock freq

[Ziqi Chen]

From: Can Guo <quic_cang@quicinc.com>

On some platforms, the devfreq OPP freq may be different than the unipro
core clock freq. Implement ufs_qcom_opp_freq_to_clk_freq() and use it to
find the unipro core clk freq.

Fixes: c02fe9e222d1 ("scsi: ufs: qcom: Implement the freq_to_gear_speed() vop")
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Co-developed-by: Ziqi Chen <quic_ziqichen@quicinc.com>
Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.com>
Tested-by: Luca Weiss <luca.weiss@fairphone.com>

---

V2 -> V3:
1. Skip calling ufs_qcom_opp_freq_to_clk_freq() if freq is ULONG_MAX to avoid
usless error prints.
2. Correct indentation size to follow Linux kernel coding style.
---
 drivers/ufs/host/ufs-qcom.c | 81 ++++++++++++++++++++++++++++++++-----
 1 file changed, 71 insertions(+), 10 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 654d970b6dec..6c054727c3bc 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -122,7 +122,9 @@ static const struct {
 };
 
 static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host);
-static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, unsigned long freq);
+static unsigned long ufs_qcom_opp_freq_to_clk_freq(struct ufs_hba *hba,
+						   unsigned long freq, char *name);
+static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, bool is_scale_up, unsigned long freq);
 
 static struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd)
 {
@@ -656,7 +658,7 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
 			return -EINVAL;
 		}
 
-		err = ufs_qcom_set_core_clk_ctrl(hba, ULONG_MAX);
+		err = ufs_qcom_set_core_clk_ctrl(hba, true, ULONG_MAX);
 		if (err)
 			dev_err(hba->dev, "cfg core clk ctrl failed\n");
 		/*
@@ -1414,29 +1416,46 @@ static int ufs_qcom_set_clk_40ns_cycles(struct ufs_hba *hba,
 	return ufshcd_dme_set(hba, UIC_ARG_MIB(PA_VS_CORE_CLK_40NS_CYCLES), reg);
 }
 
-static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, unsigned long freq)
+static int ufs_qcom_set_core_clk_ctrl(struct ufs_hba *hba, bool is_scale_up, unsigned long freq)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
 	struct list_head *head = &hba->clk_list_head;
 	struct ufs_clk_info *clki;
 	u32 cycles_in_1us = 0;
 	u32 core_clk_ctrl_reg;
+	unsigned long clk_freq;
 	int err;
 
+	if (hba->use_pm_opp && freq != ULONG_MAX) {
+		clk_freq = ufs_qcom_opp_freq_to_clk_freq(hba, freq, "core_clk_unipro");
+		if (clk_freq) {
+			cycles_in_1us = ceil(clk_freq, HZ_PER_MHZ);
+			goto set_core_clk_ctrl;
+		}
+	}
+
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk) &&
 		    !strcmp(clki->name, "core_clk_unipro")) {
-			if (!clki->max_freq)
+			if (!clki->max_freq) {
 				cycles_in_1us = 150; /* default for backwards compatibility */
-			else if (freq == ULONG_MAX)
+				break;
+			}
+
+			if (freq == ULONG_MAX) {
 				cycles_in_1us = ceil(clki->max_freq, HZ_PER_MHZ);
-			else
-				cycles_in_1us = ceil(freq, HZ_PER_MHZ);
+				break;
+			}
 
+			if (is_scale_up)
+				cycles_in_1us = ceil(clki->max_freq, HZ_PER_MHZ);
+			else
+				cycles_in_1us = ceil(clk_get_rate(clki->clk), HZ_PER_MHZ);
 			break;
 		}
 	}
 
+set_core_clk_ctrl:
 	err = ufshcd_dme_get(hba,
 			    UIC_ARG_MIB(DME_VS_CORE_CLK_CTRL),
 			    &core_clk_ctrl_reg);
@@ -1479,7 +1498,7 @@ static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba, unsigned long f
 		return ret;
 	}
 	/* set unipro core clock attributes and clear clock divider */
-	return ufs_qcom_set_core_clk_ctrl(hba, freq);
+	return ufs_qcom_set_core_clk_ctrl(hba, true, freq);
 }
 
 static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
@@ -1511,7 +1530,7 @@ static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
 static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba, unsigned long freq)
 {
 	/* set unipro core clock attributes and clear clock divider */
-	return ufs_qcom_set_core_clk_ctrl(hba, freq);
+	return ufs_qcom_set_core_clk_ctrl(hba, false, freq);
 }
 
 static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba, bool scale_up,
@@ -2081,11 +2100,53 @@ static int ufs_qcom_config_esi(struct ufs_hba *hba)
 	return ret;
 }
 
+static unsigned long ufs_qcom_opp_freq_to_clk_freq(struct ufs_hba *hba,
+						   unsigned long freq, char *name)
+{
+	struct ufs_clk_info *clki;
+	struct dev_pm_opp *opp;
+	unsigned long clk_freq;
+	int idx = 0;
+	bool found = false;
+
+	opp = dev_pm_opp_find_freq_exact_indexed(hba->dev, freq, 0, true);
+	if (IS_ERR(opp)) {
+		dev_err(hba->dev, "Failed to find OPP for exact frequency %lu\n", freq);
+		return 0;
+	}
+
+	list_for_each_entry(clki, &hba->clk_list_head, list) {
+		if (!strcmp(clki->name, name)) {
+			found = true;
+			break;
+		}
+
+		idx++;
+	}
+
+	if (!found) {
+		dev_err(hba->dev, "Failed to find clock '%s' in clk list\n", name);
+		dev_pm_opp_put(opp);
+		return 0;
+	}
+
+	clk_freq = dev_pm_opp_get_freq_indexed(opp, idx);
+
+	dev_pm_opp_put(opp);
+
+	return clk_freq;
+}
+
 static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
 {
 	u32 gear = UFS_HS_DONT_CHANGE;
+	unsigned long unipro_freq;
+
+	if (!hba->use_pm_opp)
+		return gear;
 
-	switch (freq) {
+	unipro_freq = ufs_qcom_opp_freq_to_clk_freq(hba, freq, "core_clk_unipro");
+	switch (unipro_freq) {
 	case 403000000:
 		gear = UFS_HS_G5;
 		break;
-- 
2.34.1

[PATCH v3 3/3] scsi: ufs: qcom: Call ufs_qcom_cfg_timers() in clock scaling path

[Ziqi Chen]

From: Can Guo <quic_cang@quicinc.com>

ufs_qcom_cfg_timers() is clock freq dependent like ufs_qcom_set_core_clk_
ctrl(), hence move ufs_qcom_cfg_timers() call to clock scaling path. In
addition, do not assume the devfreq OPP freq is always the 'core_clock'
freq although 'core_clock' is the first clock phandle in device tree, use
ufs_qcom_opp_freq_to_clk_freq() to find the core clk freq.

Signed-off-by: Can Guo <quic_cang@quicinc.com>
Co-developed-by: Ziqi Chen <quic_ziqichen@quicinc.com>
Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.com>
Tested-by: Luca Weiss <luca.weiss@fairphone.com>

---
V2 -> V3:
Skip calling ufs_qcom_opp_freq_to_clk_freq() if freq is ULONG_MAX to avoid
usless error prints.
---
 drivers/ufs/host/ufs-qcom.c | 49 ++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 20 deletions(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index 6c054727c3bc..d23ff912fda4 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -599,13 +599,14 @@ static int ufs_qcom_hce_enable_notify(struct ufs_hba *hba,
  *
  * @hba: host controller instance
  * @is_pre_scale_up: flag to check if pre scale up condition.
+ * @freq: target opp freq
  * Return: zero for success and non-zero in case of a failure.
  */
-static int ufs_qcom_cfg_timers(struct ufs_hba *hba, bool is_pre_scale_up)
+static int ufs_qcom_cfg_timers(struct ufs_hba *hba, bool is_pre_scale_up, unsigned long freq)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
 	struct ufs_clk_info *clki;
-	unsigned long core_clk_rate = 0;
+	unsigned long clk_freq = 0;
 	u32 core_clk_cycles_per_us;
 
 	/*
@@ -617,22 +618,34 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, bool is_pre_scale_up)
 	if (host->hw_ver.major < 4 && !ufshcd_is_intr_aggr_allowed(hba))
 		return 0;
 
+	if (hba->use_pm_opp && freq != ULONG_MAX) {
+		clk_freq = ufs_qcom_opp_freq_to_clk_freq(hba, freq, "core_clk");
+		if (clk_freq)
+			goto cfg_timers;
+	}
+
 	list_for_each_entry(clki, &hba->clk_list_head, list) {
 		if (!strcmp(clki->name, "core_clk")) {
+			if (freq == ULONG_MAX) {
+				clk_freq = clki->max_freq;
+				break;
+			}
+
 			if (is_pre_scale_up)
-				core_clk_rate = clki->max_freq;
+				clk_freq = clki->max_freq;
 			else
-				core_clk_rate = clk_get_rate(clki->clk);
+				clk_freq = clk_get_rate(clki->clk);
 			break;
 		}
 
 	}
 
+cfg_timers:
 	/* If frequency is smaller than 1MHz, set to 1MHz */
-	if (core_clk_rate < DEFAULT_CLK_RATE_HZ)
-		core_clk_rate = DEFAULT_CLK_RATE_HZ;
+	if (clk_freq < DEFAULT_CLK_RATE_HZ)
+		clk_freq = DEFAULT_CLK_RATE_HZ;
 
-	core_clk_cycles_per_us = core_clk_rate / USEC_PER_SEC;
+	core_clk_cycles_per_us = clk_freq / USEC_PER_SEC;
 	if (ufshcd_readl(hba, REG_UFS_SYS1CLK_1US) != core_clk_cycles_per_us) {
 		ufshcd_writel(hba, core_clk_cycles_per_us, REG_UFS_SYS1CLK_1US);
 		/*
@@ -652,7 +665,7 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
 
 	switch (status) {
 	case PRE_CHANGE:
-		if (ufs_qcom_cfg_timers(hba, false)) {
+		if (ufs_qcom_cfg_timers(hba, false, ULONG_MAX)) {
 			dev_err(hba->dev, "%s: ufs_qcom_cfg_timers() failed\n",
 				__func__);
 			return -EINVAL;
@@ -930,17 +943,6 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
 
 		break;
 	case POST_CHANGE:
-		if (ufs_qcom_cfg_timers(hba, false)) {
-			dev_err(hba->dev, "%s: ufs_qcom_cfg_timers() failed\n",
-				__func__);
-			/*
-			 * we return error code at the end of the routine,
-			 * but continue to configure UFS_PHY_TX_LANE_ENABLE
-			 * and bus voting as usual
-			 */
-			ret = -EINVAL;
-		}
-
 		/* cache the power mode parameters to use internally */
 		memcpy(&host->dev_req_params,
 				dev_req_params, sizeof(*dev_req_params));
@@ -1492,7 +1494,7 @@ static int ufs_qcom_clk_scale_up_pre_change(struct ufs_hba *hba, unsigned long f
 {
 	int ret;
 
-	ret = ufs_qcom_cfg_timers(hba, true);
+	ret = ufs_qcom_cfg_timers(hba, true, freq);
 	if (ret) {
 		dev_err(hba->dev, "%s ufs cfg timer failed\n", __func__);
 		return ret;
@@ -1529,6 +1531,13 @@ static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
 
 static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba, unsigned long freq)
 {
+	int ret;
+
+	ret = ufs_qcom_cfg_timers(hba, false, freq);
+	if (ret) {
+		dev_err(hba->dev, "%s: ufs_qcom_cfg_timers() failed\n",	__func__);
+		return ret;
+	}
 	/* set unipro core clock attributes and clear clock divider */
 	return ufs_qcom_set_core_clk_ctrl(hba, false, freq);
 }
-- 
2.34.1

Re: [PATCH v3 2/3] scsi: ufs: qcom: Map devfreq OPP freq to UniPro Core Clock freq

[Bean Huo]

On Fri, 2025-05-09 at 15:50 +0800, Ziqi Chen wrote:
> From: Can Guo <quic_cang@quicinc.com>
> 
> On some platforms, the devfreq OPP freq may be different than the unipro
> core clock freq. Implement ufs_qcom_opp_freq_to_clk_freq() and use it to
> find the unipro core clk freq.
> 
> Fixes: c02fe9e222d1 ("scsi: ufs: qcom: Implement the freq_to_gear_speed() vop")
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Ziqi Chen <quic_ziqichen@quicinc.com>
> Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.com>
> Tested-by: Luca Weiss <luca.weiss@fairphone.com>


Looks good to me:

Reviewed-by: Bean Huo <beanhuo@micron.com>

Re: [PATCH v3 3/3] scsi: ufs: qcom: Call ufs_qcom_cfg_timers() in clock scaling path

[Bean Huo]

On Fri, 2025-05-09 at 15:50 +0800, Ziqi Chen wrote:
> From: Can Guo <quic_cang@quicinc.com>
> 
> ufs_qcom_cfg_timers() is clock freq dependent like ufs_qcom_set_core_clk_
> ctrl(), hence move ufs_qcom_cfg_timers() call to clock scaling path. In
> addition, do not assume the devfreq OPP freq is always the 'core_clock'
> freq although 'core_clock' is the first clock phandle in device tree, use
> ufs_qcom_opp_freq_to_clk_freq() to find the core clk freq.
> 
> Signed-off-by: Can Guo <quic_cang@quicinc.com>
> Co-developed-by: Ziqi Chen <quic_ziqichen@quicinc.com>
> Signed-off-by: Ziqi Chen <quic_ziqichen@quicinc.com>
> Tested-by: Luca Weiss <luca.weiss@fairphone.com>

Reviewed-by: Bean Huo <beanhuo@micron.com>