linux-kernel - [PATCH 2/4] drm/vc4: hdmi: Put the device on error in pre_crtc

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Message-Id: <20210629125736.414467-3-maxime@cerno.tech>
Date:   Tue, 29 Jun 2021 14:57:34 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>
Cc:     linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Boris Brezillon <bbrezillon@...nel.org>,
        Emma Anholt <emma@...olt.net>,
        Maxime Ripard <mripard@...nel.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>,
        linux-rpi-kernel@...ts.infradead.org
Subject: [PATCH 2/4] drm/vc4: hdmi: Put the device on error in pre_crtc_configure

In the vc4_hdmi_encoder_pre_crtc_configure() function error path we
never actually call pm_runtime_put() even though
pm_runtime_resume_and_get() is our very first call.

Fixes: 4f6e3d66ac52 ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 707fe43ffeea..b3db38d37550 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -958,6 +958,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	if (ret) {
 		DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret);
 		clk_disable_unprepare(vc4_hdmi->pixel_clock);
+		pm_runtime_put(&vc4_hdmi->pdev->dev);
 		return;
 	}
 
@@ -965,6 +966,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
 	if (ret) {
 		DRM_ERROR("Failed to turn on pixel bvb clock: %d\n", ret);
 		clk_disable_unprepare(vc4_hdmi->pixel_clock);
+		pm_runtime_put(&vc4_hdmi->pdev->dev);
 		return;
 	}
 
-- 
2.31.1