linux-kernel - Re: [PATCH] drm/vc4: Fix HDMI mode validation

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Message-ID: <20200327124014.cpadv7npw2q6iaxe@gilmour.lan>
Date:   Fri, 27 Mar 2020 13:40:14 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Eric Anholt <eric@...olt.net>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-rpi-kernel@...ts.infradead.org, f.fainelli@...il.com,
        Stefan Wahren <stefan.wahren@...e.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vc4: Fix HDMI mode validation

On Fri, Mar 27, 2020 at 12:46:52PM +0100, Nicolas Saenz Julienne wrote:
> Hi Daniel,
>
> On Thu, 2020-03-26 at 13:20 +0100, Nicolas Saenz Julienne wrote:
> > Current mode validation impedes setting up some video modes which should
> > be supported otherwise. Namely 1920x1200@...z.
> >
> > Fix this by lowering the minimum HDMI state machine clock to pixel clock
> > ratio allowed.
> >
> > Fixes: 32e823c63e90 ("drm/vc4: Reject HDMI modes with too high of clocks")
> > Reported-by: Stefan Wahren <stefan.wahren@...e.com>
> > Suggested-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
>
> Would it be possible for you to take this in for v5.7 (or as a fix for v5.6,
> but it seems a little late)?
>
> A device-tree patch I have to channel trough the SoC tree depends on this to
> avoid regressions.

I've applied it for 5.7-rc1

Maxime

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