linux-kernel - Re: [PATCH] drm: Move drm_set_preferred_mode() helper from drm_edid to drm

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Message-ID: <87o7e43p79.fsf@minerva.mail-host-address-is-not-set>
Date: Tue, 02 Jan 2024 13:16:42 +0100
From: Javier Martinez Canillas <javierm@...hat.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>, linux-kernel@...r.kernel.org
Cc: Thomas Zimmermann <tzimmermann@...e.de>, Maxime Ripard
 <mripard@...nel.org>, dri-devel@...ts.freedesktop.org, David Airlie
 <airlied@...il.com>
Subject: Re: [PATCH] drm: Move drm_set_preferred_mode() helper from drm_edid
 to drm_modes

Jani Nikula <jani.nikula@...ux.intel.com> writes:

Hello Jani,

> On Tue, 02 Jan 2024, Javier Martinez Canillas <javierm@...hat.com> wrote:
>> The helper is generic and doesn't use the opaque EDID type struct drm_edid
>> and is also used by drivers that only support non-probeable displays, such
>> as fixed panels.
>>
>> These drivers add a list of modes using drm_mode_probed_add() and then set
>> a preferred mode using the drm_set_preferred_mode() helper.
>>
>> It seems more logical to have the helper definition in drm_modes.o instead
>> of drm_edid.o, since the former contains modes helper while the latter has
>> helpers to manage the EDID information.
>>
>> Since both drm_edid.o and drm_modes.o object files are built-in the drm.o
>> object, there are no functional changes. But besides being a more logical
>> place for this helper, it could also allow to eventually make drm_edid.o
>> optional and not included in drm.o if only fixed panels must be supported
>> in a given system.
>>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>> ---
>>
>>  drivers/gpu/drm/drm_edid.c  | 23 +----------------------
>>  drivers/gpu/drm/drm_modes.c | 22 ++++++++++++++++++++++
>>  include/drm/drm_edid.h      |  2 --
>>  include/drm/drm_modes.h     |  2 ++
>>  4 files changed, 25 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index cb4031d5dcbb..48dd2a0a0395 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -43,6 +43,7 @@
>>  #include <drm/drm_edid.h>
>>  #include <drm/drm_eld.h>
>>  #include <drm/drm_encoder.h>
>> +#include <drm/drm_modes.h>
>
> Unnecessary.
>

Indeed. I could swear that saw drm_set_preferred_mode() being called
somewhere in drm_edid.c but looking again I see that's not the case.

> Other than that,
>
> Reviewed-by: Jani Nikula <jani.nikula@...el.com>
>

Thanks. I'll post a v2 that drops the unnecessary header include.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat