linux-kernel - Re: [PATCH v2] drm/gma500: replace drm_detect_hdmi_monitor() with drm_display_info.is

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Message-ID: <57016d01-4525-4685-b029-41e03b0abbda@suse.de>
Date: Thu, 12 Sep 2024 12:45:11 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Jani Nikula <jani.nikula@...ux.intel.com>,
 Tejas Vipin <tejasvipin76@...il.com>, Laurent.pinchart@...asonboard.com,
 patrik.r.jakobsson@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, airlied@...il.com, daniel@...ll.ch
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/gma500: replace drm_detect_hdmi_monitor() with
 drm_display_info.is_hdmi

Hi

Am 12.09.24 um 11:38 schrieb Jani Nikula:
> On Thu, 12 Sep 2024, Thomas Zimmermann <tzimmermann@...e.de> wrote:
>> Am 12.09.24 um 10:56 schrieb Jani Nikula:
>>> Moreover, in this case .detect() only detects digital displays as
>>> reported by EDID. If you postpone that to .get_modes(), the probe helper
>>> will still report connected, and invent non-EDID fallback modes. The
>>> behaviour changes.
>> The change in behavior is intentional, because the current test seems
>> arbitrary. Does the driver not work with analog outputs?
> Not on a DVI/HDMI port. Same with i915.
>
> That's possibly the only way to distinguish a DVI-A display connected to
> DVI-D source.

That's a detect failure, but IMHO our probe helpers should really handle 
this case.

Best regards
Thomas

>
>
> BR,
> Jani.
>
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)