linux-kernel - [RFC v2 07/11] scsi: ufs: Add support for specifying OPP tables in DT

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Message-Id: <20190320094918.20234-8-rnayak@codeaurora.org>
Date:   Wed, 20 Mar 2019 15:19:14 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-spi@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-scsi@...r.kernel.org,
        swboyd@...omium.org, ulf.hansson@...aro.org,
        viresh.kumar@...aro.org, dianders@...omium.org, rafael@...nel.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [RFC v2 07/11] 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>
---
 drivers/scsi/ufs/ufshcd.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ffa9e58680b4..2b260e83874a 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -913,6 +913,16 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
 	if (ret)
 		return ret;
 
+	if (hba->virt_devs) {
+		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) {
@@ -1318,6 +1328,7 @@ static int ufshcd_devfreq_init(struct ufs_hba *hba)
 	struct list_head *clk_list = &hba->clk_list_head;
 	struct ufs_clk_info *clki;
 	struct devfreq *devfreq;
+	struct device *virt_dev;
 	int ret;
 
 	/* Skip devfreq if we don't have any clocks in the list */
@@ -1325,8 +1336,14 @@ 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);
+	} else {
+		virt_dev = hba->virt_devs[hba->num_virt_devs -1];
+		dev_pm_opp_set_genpd_virt_dev(hba->dev, virt_dev, 0);
+	}
 
 	devfreq = devfreq_add_device(hba->dev,
 			&ufs_devfreq_profile,
-- 
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