linux-kernel - Re: [PATCH 3/3] drm/vc4: hdmi: Make sure the controller is powered in detect

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Date:   Wed, 16 Jun 2021 14:35:59 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc:     DRI Development <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>,
        Daniel Vetter <daniel@...ll.ch>,
        Boris Brezillon <bbrezillon@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Anholt <eric@...olt.net>, Emma Anholt <emma@...olt.net>,
        Phil Elwell <phil@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH 3/3] drm/vc4: hdmi: Make sure the controller is powered
 in detect

On Wed, Jun 16, 2021 at 11:51:26AM +0100, Dave Stevenson wrote:
> On Tue, 25 May 2021 at 10:11, Maxime Ripard <maxime@...no.tech> wrote:
> >
> > If the HPD GPIO is not available and drm_probe_ddc fails, we end up
> > reading the HDMI_HOTPLUG register, but the controller might be powered
> > off resulting in a CPU hang. Make sure we have the power domain and the
> > HSM clock powered during the detect cycle to prevent the hang from
> > happening.
> >
> > Fixes: 4f6e3d66ac52 ("drm/vc4: Add runtime PM support to the HDMI encoder driver")
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
> 
> Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

Applied patches 2 and 3, I'll resend a new version of patch 1 after some
comments by Daniel on IRC.

Thanks!
Maxime

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