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From: Nicolas Boichat <drinkcat@chromium.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	David Airlie <airlied@linux.ie>,
	linux-kernel@vger.kernel.org, Liam Girdwood <lgirdwood@gmail.com>,
	dri-devel@lists.freedesktop.org,
	Steven Price <steven.price@arm.com>,
	Mark Brown <broonie@kernel.org>,
	linux-mediatek@lists.infradead.org,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	hsinyi@chromium.org, Matthias Brugger <matthias.bgg@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 7/7, RFC] drm/panfrost: devfreq: Add support for 2 regulators
Date: Tue, 14 Jan 2020 15:16:02 +0800
Message-ID: <20200114071602.47627-8-drinkcat@chromium.org> (raw)
In-Reply-To: <20200114071602.47627-1-drinkcat@chromium.org>

The Bifrost GPU on MT8183 uses 2 regulators (core and SRAM) for
devfreq, and provides OPP table with 2 sets of voltages.

TODO: This is incomplete as we'll need add support for setting
a pair of voltages as well.

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>

---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 17 +++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_device.h  |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 413987038fbfccb..9c0987a3d71c597 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -79,6 +79,21 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct devfreq *devfreq;
 	struct thermal_cooling_device *cooling;
 
+	/* If we have 2 regulator, we need an OPP table with 2 voltages. */
+	if (pfdev->comp->num_supplies > 1) {
+		pfdev->devfreq.dev_opp_table =
+			dev_pm_opp_set_regulators(dev,
+					pfdev->comp->supply_names,
+					pfdev->comp->num_supplies);
+		if (IS_ERR(pfdev->devfreq.dev_opp_table)) {
+			ret = PTR_ERR(pfdev->devfreq.dev_opp_table);
+			pfdev->devfreq.dev_opp_table = NULL;
+			dev_err(dev,
+				"Failed to init devfreq opp table: %d\n", ret);
+			return ret;
+		}
+	}
+
 	ret = dev_pm_opp_of_add_table(dev);
 	if (ret == -ENODEV) /* Optional, continue without devfreq */
 		return 0;
@@ -119,6 +134,8 @@ void panfrost_devfreq_fini(struct panfrost_device *pfdev)
 	if (pfdev->devfreq.cooling)
 		devfreq_cooling_unregister(pfdev->devfreq.cooling);
 	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
+	if (pfdev->devfreq.dev_opp_table)
+		dev_pm_opp_put_regulators(pfdev->devfreq.dev_opp_table);
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 143eab57180a2e1..30ba11cbf600847 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -108,6 +108,7 @@ struct panfrost_device {
 	struct {
 		struct devfreq *devfreq;
 		struct thermal_cooling_device *cooling;
+		struct opp_table *dev_opp_table;
 		ktime_t busy_time;
 		ktime_t idle_time;
 		ktime_t time_last_update;
-- 
2.25.0.rc1.283.g88dfdc4193-goog

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      parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14  7:15 [PATCH v3 0/7] Add dts for mt8183 GPU (and misc panfrost patches) Nicolas Boichat
2020-01-14  7:15 ` [PATCH v3 1/7] dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183 Nicolas Boichat
2020-01-14  7:15 ` [PATCH v3 2/7] arm64: dts: mt8183: Add node for the Mali GPU Nicolas Boichat
2020-01-14  7:15 ` [PATCH v3 3/7] drm/panfrost: Improve error reporting in panfrost_gpu_power_on Nicolas Boichat
2020-01-14  7:15 ` [PATCH v3 4/7] drm/panfrost: Add support for multiple regulators Nicolas Boichat
2020-01-14 15:16   ` Mark Brown
2020-01-21  4:37     ` Nicolas Boichat
2020-01-22 13:40       ` Steven Price
2020-01-20 14:43   ` Steven Price
2020-01-20 17:03     ` Mark Brown
2020-01-20 17:09       ` Steven Price
2020-01-14  7:16 ` [PATCH v3 5/7] drm/panfrost: Add support for multiple power domains Nicolas Boichat
2020-01-20 14:53   ` Steven Price
2020-02-07  3:06     ` Nicolas Boichat
2020-01-14  7:16 ` [PATCH v3 6/7, RFC] drm/panfrost: Add mt8183-mali compatible string Nicolas Boichat
2020-01-14  7:16 ` Nicolas Boichat [this message]

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