linux-kernel - Re: [PATCH 2/5] host1x: hdmi: Detect whether display is connected with HDMI or DVI

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Message-ID: <20130828120727.GA32254@ulmo>
Date:	Wed, 28 Aug 2013 14:07:28 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Mikko Perttunen <mperttunen@...dia.com>
Cc:	tbergstrom@...dia.com, dri-devel@...ts.freedesktop.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] host1x: hdmi: Detect whether display is connected
 with HDMI or DVI

On Wed, Aug 28, 2013 at 01:40:56PM +0300, Mikko Perttunen wrote:
> Use EDID data to determine whether the display supports HDMI or just DVI.
> This used to be hardcoded to be HDMI, which broke support for DVI displays
> that couldn't understand the interspersed audio/other data.
> 
> If the EDID data isn't available, default to DVI, which should be a safer
> choice.
> 
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
>  drivers/gpu/host1x/drm/hdmi.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/host1x/drm/hdmi.c b/drivers/gpu/host1x/drm/hdmi.c
> index d81fac8..140339b 100644
> --- a/drivers/gpu/host1x/drm/hdmi.c
> +++ b/drivers/gpu/host1x/drm/hdmi.c
> @@ -702,6 +702,14 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
>  	unsigned long value;
>  	int retries = 1000;
>  	int err;
> +	struct drm_property_blob *edid_blob = output->connector.edid_blob_ptr;
> +
> +	if (edid_blob && edid_blob->data &&
> +		drm_detect_hdmi_monitor((struct edid *)edid_blob->data)) {
> +		hdmi->dvi = false;
> +	} else {
> +		hdmi->dvi = true;
> +	}
>  
>  	pclk = mode->clock * 1000;
>  	h_sync_width = mode->hsync_end - mode->hsync_start;

Odd, now that I see that code I remember that there was a similar patch
a few months back, but it was never applied for some reason:

	http://lists.freedesktop.org/archives/dri-devel/2013-January/033509.html

That was already reviewed by me and Jon Mayo, so I'll go ahead and apply
that one instead.

Thierry

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