linux-kernel - [PATCH 07/21] scsi: ufs: Add support for specifying OPP tables in DT

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Message-Id: <1586353607-32222-8-git-send-email-rnayak@codeaurora.org>
Date:   Wed,  8 Apr 2020 19:16:33 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org,
        bjorn.andersson@...aro.org, agross@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        linux-scsi@...r.kernel.org
Subject: [PATCH 07/21] scsi: ufs: Add support for specifying OPP tables in DT

Some platforms like qualcomms sdm845 SoC have a need to set
a performance state of a power domain for UFS along with
setting the clock rate. Add support for passing this freq/perf state
tuple from DT as an OPP table. Modify the driver to read the OPP
table and register with OPP layer.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
Cc: Alim Akhtar <alim.akhtar@...sung.com>
Cc: Can Guo <cang@...eaurora.org>
Cc: Asutosh Das <asutoshd@...eaurora.org>
Cc: Subhash Jadavani <subhashj@...eaurora.org>
Cc: linux-scsi@...r.kernel.org
---
 drivers/scsi/ufs/ufshcd.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index e04e8b8..172c6fe 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -883,6 +883,16 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
 	if (ret)
 		return ret;
 
+	if (hba->opp_virt_dev) {
+		struct dev_pm_opp *opp;
+		unsigned long freq = scale_up ? INT_MAX : 0;
+		if (scale_up)
+			opp = dev_pm_opp_find_freq_floor(hba->dev, &freq);
+		else
+			opp = dev_pm_opp_find_freq_ceil(hba->dev, &freq);
+		dev_pm_opp_set_rate(hba->dev, dev_pm_opp_get_freq(opp));
+	}
+
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk)) {
 			if (scale_up && clki->max_freq) {
@@ -1339,8 +1349,11 @@ static int ufshcd_devfreq_init(struct ufs_hba *hba)
 		return 0;
 
 	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
-	dev_pm_opp_add(hba->dev, clki->min_freq, 0);
-	dev_pm_opp_add(hba->dev, clki->max_freq, 0);
+
+	if (dev_pm_opp_of_add_table(hba->dev)) {
+		dev_pm_opp_add(hba->dev, clki->min_freq, 0);
+		dev_pm_opp_add(hba->dev, clki->max_freq, 0);
+	}
 
 	ufshcd_vops_config_scaling_param(hba, &ufs_devfreq_profile,
 					 gov_data);
-- 
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