linux-kernel - [PATCH v3 4/5] drm/panfrost: devfreq: set opp to the recommended one to configure and enable regulator

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Date:   Mon,  5 Sep 2022 19:16:00 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Bjorn Andersson <andersson@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Arnd Bergmann <arnd@...db.de>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Rob Herring <robh@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Clément Péron <peron.clem@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH v3 4/5] drm/panfrost: devfreq: set opp to the recommended one to configure and enable regulator

devm_pm_opp_set_regulators() doesn't enable regulator, which make
regulator framework switching it off during regulator_late_cleanup().

Call dev_pm_opp_set_opp() with the recommend OPP in
panfrost_devfreq_init() to enable the regulator and avoid any switch off
by regulator_late_cleanup().

Suggested-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Clément Péron <peron.clem@...il.com>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index 5110cd9b2425..67b242407156 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -131,6 +131,14 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
 		return PTR_ERR(opp);
 
 	panfrost_devfreq_profile.initial_freq = cur_freq;
+
+	/* Setup and enable regulator */
+	ret = dev_pm_opp_set_opp(dev, opp);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Couldn't set recommended OPP\n");
+		return ret;
+	}
+
 	dev_pm_opp_put(opp);
 
 	/*
-- 
2.34.1