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From: Rajendra Nayak <rnayak@codeaurora.org>
To: linux-kernel@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-serial@vger.kernel.org, linux-spi@vger.kernel.org,
	dri-devel@lists.freedesktop.org, linux-scsi@vger.kernel.org,
	swboyd@chromium.org, ulf.hansson@linaro.org,
	viresh.kumar@linaro.org, dianders@chromium.org,
	rafael@kernel.org, Rajendra Nayak <rnayak@codeaurora.org>
Subject: [RFC v2 02/11] OPP: Make dev_pm_opp_set_rate() with freq=0 as valid
Date: Wed, 20 Mar 2019 15:19:09 +0530
Message-ID: <20190320094918.20234-3-rnayak@codeaurora.org> (raw)
In-Reply-To: <20190320094918.20234-1-rnayak@codeaurora.org>

For devices with performance state, we use dev_pm_opp_set_rate()
to set the appropriate clk rate and the performance state.
We do need a way to *remove* the performance state vote when
we idle the device and turn the clocks off. Use dev_pm_opp_set_rate()
with freq=0 to achieve this.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/opp/core.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index bc9a7762dd4c..d6acc880676e 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -708,18 +708,24 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
 	struct clk *clk;
 	int ret;
 
-	if (unlikely(!target_freq)) {
-		dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
-			target_freq);
-		return -EINVAL;
-	}
-
 	opp_table = _find_opp_table(dev);
 	if (IS_ERR(opp_table)) {
 		dev_err(dev, "%s: device opp doesn't exist\n", __func__);
 		return PTR_ERR(opp_table);
 	}
 
+	if (unlikely(!target_freq)) {
+		if (opp_table->required_opp_tables) {
+			/* drop the performance state vote */
+			dev_pm_genpd_set_performance_state(dev, 0);
+			return 0;
+		} else {
+			dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
+				target_freq);
+			return -EINVAL;
+		}
+	}
+
 	clk = opp_table->clk;
 	if (IS_ERR(clk)) {
 		dev_err(dev, "%s: No clock available for the device\n",
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20  9:49 [RFC v2 00/11] DVFS in the OPP core Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 01/11] OPP: Don't overwrite rounded clk rate Rajendra Nayak
2019-06-11 10:54   ` Viresh Kumar
2019-06-12  7:42     ` Rajendra Nayak
2019-06-12  8:25       ` Viresh Kumar
2019-06-13  9:54         ` Viresh Kumar
2019-06-14  5:27           ` Viresh Kumar
2019-06-17  3:50             ` Viresh Kumar
2019-06-17  4:07               ` Rajendra Nayak
2019-06-17  4:17                 ` Viresh Kumar
2019-06-17  4:25                   ` Rajendra Nayak
2019-06-14  5:54           ` Rajendra Nayak
2019-03-20  9:49 ` Rajendra Nayak [this message]
2019-06-14  6:32   ` [RFC v2 02/11] OPP: Make dev_pm_opp_set_rate() with freq=0 as valid Viresh Kumar
2019-06-17  4:04     ` Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 03/11] tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 04/11] spi: spi-geni-qcom: " Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 05/11] arm64: dts: sdm845: Add OPP table for all qup devices Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 06/11] scsi: ufs: Add support to manage multiple power domains in ufshcd-pltfrm Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 07/11] scsi: ufs: Add support for specifying OPP tables in DT Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 08/11] arm64: dts: sdm845: Add ufs opps and power-domains Rajendra Nayak
2019-05-14  7:53   ` Ulf Hansson
2019-03-20  9:49 ` [RFC v2 09/11] drm/msm/dpu: Use OPP API to set clk/perf state Rajendra Nayak
2019-04-10  3:49   ` Viresh Kumar
2019-04-10  3:49     ` Viresh Kumar
2019-03-20  9:49 ` [RFC v2 10/11] drm/msm: dsi: " Rajendra Nayak
2019-03-20  9:49 ` [RFC v2 11/11] arm64: dts: sdm845: Add DSI and MDP OPP tables and power-domains Rajendra Nayak
2019-04-10  3:51 ` [RFC v2 00/11] DVFS in the OPP core Viresh Kumar
2019-04-10  3:51   ` Viresh Kumar
2019-05-21  6:22 ` Viresh Kumar
2019-05-24  6:03   ` Rajendra Nayak
2019-06-17  4:26 ` Viresh Kumar

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