linux-kernel - [PATCH v8 3/4] drm/panfrost: devfreq: Disable devfreq when num

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Message-Id: <20210107170017.v8.3.I3af068abe30c9c85cabc4486385c52e56527a509@changeid>
Date:   Thu,  7 Jan 2021 17:00:21 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Cc:     hsinyi@...omium.org, hoegsberg@...omium.org,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        boris.brezillon@...labora.com, fshao@...omium.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v8 3/4] drm/panfrost: devfreq: Disable devfreq when num_supplies > 1

GPUs with more than a single regulator (e.g. G72 on MT8183) will
require platform-specific handling, disable devfreq for now.

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---

Changes in v8:
 - Use DRM_DEV_INFO instead of ERROR

Changes in v7:
 - Fix GPU ID in commit message

Changes in v6:
 - New change

 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index f44d28fad085..812cfecdee3b 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -92,6 +92,15 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 	struct thermal_cooling_device *cooling;
 	struct panfrost_devfreq *pfdevfreq = &pfdev->pfdevfreq;
 
+	if (pfdev->comp->num_supplies > 1) {
+		/*
+		 * GPUs with more than 1 supply require platform-specific handling:
+		 * continue without devfreq
+		 */
+		DRM_DEV_INFO(dev, "More than 1 supply is not supported yet\n");
+		return 0;
+	}
+
 	opp_table = dev_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
 					      pfdev->comp->num_supplies);
 	if (IS_ERR(opp_table)) {
-- 
2.29.2.729.g45daf8777d-goog