linux-kernel - [PATCH 0/4] drm/vc4: hdmi: Fix CEC access while disabled

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Message-Id: <20210629125736.414467-1-maxime@cerno.tech>
Date:   Tue, 29 Jun 2021 14:57:32 +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 0/4] drm/vc4: hdmi: Fix CEC access while disabled

Hi,

This series aims at fixing a complete and silent hang when one tries to use CEC
while the display output is off.

This can be tested with:

echo off > /sys/class/drm/card0-HDMI-A-1/status
cec-ctl --tuner -p 1.0.0.0
cec-compliance

This series addresses it by making sure the HDMI controller is powered up as
soon as the CEC device is opened by the userspace.

Let me know what you think,
Maxime

Maxime Ripard (4):
  drm/vc4: hdmi: Mark the device as active if running
  drm/vc4: hdmi: Put the device on error in pre_crtc_configure
  drm/vc4: hdmi: Split the CEC disable / enable functions in two
  drm/vc4: hdmi: Make sure the device is powered with CEC

 drivers/gpu/drm/vc4/vc4_hdmi.c | 85 ++++++++++++++++++++++------------
 1 file changed, 55 insertions(+), 30 deletions(-)

-- 
2.31.1