linux-kernel - Re: [PATCH 3/3 v3] drm: bridge/dw-hdmi: Move edid reading to .detect() callback

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Message-ID: <20160804150443.GW1041@n2100.armlinux.org.uk>
Date:	Thu, 4 Aug 2016 16:04:43 +0100
From:	Russell King - ARM Linux <linux@...linux.org.uk>
To:	Jose Abreu <Jose.Abreu@...opsys.com>
Cc:	dri-devel@...ts.freedesktop.org,
	Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
	Archit Taneja <architt@...eaurora.org>,
	David Airlie <airlied@...ux.ie>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Takashi Iwai <tiwai@...e.de>,
	Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
	Thierry Reding <treding@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3 v3] drm: bridge/dw-hdmi: Move edid reading to
 .detect() callback

On Thu, Aug 04, 2016 at 03:57:21PM +0100, Jose Abreu wrote:
> Hmm, I am not debugging it right now but I remember that
> drm_fb_helper_probe_connector_modes() was not being called at the
> time I set the new EDID but only after I stopped sending video (I
> was using modetest).

Please investigate - I'd prefer that your patch does not get applied
until we really know what's going on here.

Hmm, if you're using modetest, then userspace is setting a mode, and
userspace is in control of the DRM device - that's probably the reason
why you're not seeing anything happening - modetest probably doesn't
know anything about hotplug events, and so doesn't read the modes.

Have you tried with the framebuffer console and DRM fbdev emulation
enabled, without using modetest?

-- 
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