linux-kernel - Re: [PATCH v3 2/4] drm/edid: Add a function to check monitor string

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Message-ID: <87y1ax2iu1.fsf@intel.com>
Date: Tue, 05 Mar 2024 10:17:42 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Doug Anderson <dianders@...omium.org>, Hsin-Yi Wang <hsinyi@...omium.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang
 <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, Maarten
 Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David
 Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Dmitry
 Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v3 2/4] drm/edid: Add a function to check monitor string

On Mon, 04 Mar 2024, Doug Anderson <dianders@...omium.org> wrote:
> Hi,
>
> On Mon, Mar 4, 2024 at 4:19 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>>
>> > > Probably change to u32 drm_edid_get_panel_id(const struct drm_edid
>> > > *);? Given that we still need to parse id from
>> > > drm_edid_read_base_block().
>> >
>> > No, we no longer need to parse the id outside of drm_edid.c. You'll have
>> > the id's in panel code in the form of struct drm_edid_ident (or
>> > whatever), and use the match function to see if the opaque drm_edid
>> > matches.
>> >
>> drm_panel prints the panel_id info on whether the panel is detected or not.
>> https://elixir.bootlin.com/linux/v6.8-rc7/source/drivers/gpu/drm/panel/panel-edp.c#L792
>>
>> Is it okay to remove this information?
>
> Hmmm, I guess it also is exported via debugfs, actually. See
> detected_panel_show() in panel-edp.c. We probably don't want to remove
> that...

You currently print the information via panel->detected_panel, which is
a struct edp_panel_entry *. That doesn't change. It'll be slightly
restructured to contain a struct drm_edid_ident, which will not be an
opaque type.

BR,
Jani.


-- 
Jani Nikula, Intel