linux-kernel - [PATCH AUTOSEL 5.13 026/189] drm/panfrost: devfreq: Disable devfreq when num

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Date:   Tue,  6 Jul 2021 07:11:26 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.13 026/189] drm/panfrost: devfreq: Disable devfreq when num_supplies > 1

From: Nicolas Boichat <drinkcat@...omium.org>

[ Upstream commit 09da3191827f2fd326205fb58881838e6ea36fb7 ]

GPUs with more than a single regulator (e.g. G72 on MT8183) will
require platform-specific handling for devfreq, for 2 reasons:
 1. The opp core (drivers/opp/core.c:_generic_set_opp_regulator)
    does not support multiple regulators, so we'll need custom
    handlers.
 2. Generally, platforms with 2 regulators have platform-specific
    constraints on how the voltages should be set (e.g.
    minimum/maximum voltage difference between them), so we
    should not just create generic handlers that simply
    change the voltages without taking care of those constraints.

Disable devfreq for now on those GPUs.

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
Reviewed-by: Steven Price <steven.price@....com>
Signed-off-by: Steven Price <steven.price@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210421132841.v13.3.I3af068abe30c9c85cabc4486385c52e56527a509@changeid
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 47d27e54a34f..3644652f726f 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;
+	}
+
 	ret = devm_pm_opp_set_regulators(dev, pfdev->comp->supply_names,
 					 pfdev->comp->num_supplies);
 	if (ret) {
-- 
2.30.2