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

From: Rajendra Nayak <rnayak@codeaurora.org>
To: viresh.kumar@linaro.org, sboyd@kernel.org,
	bjorn.andersson@linaro.org, agross@kernel.org
Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Can Guo <cang@codeaurora.org>,
	Asutosh Das <asutoshd@codeaurora.org>,
	Subhash Jadavani <subhashj@codeaurora.org>,
	linux-scsi@vger.kernel.org
Subject: [PATCH 07/21] scsi: ufs: Add support for specifying OPP tables in DT
Date: Wed,  8 Apr 2020 19:16:33 +0530	[thread overview]
Message-ID: <1586353607-32222-8-git-send-email-rnayak@codeaurora.org> (raw)
In-Reply-To: <1586353607-32222-1-git-send-email-rnayak@codeaurora.org>

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@codeaurora.org>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Asutosh Das <asutoshd@codeaurora.org>
Cc: Subhash Jadavani <subhashj@codeaurora.org>
Cc: linux-scsi@vger.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);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
