linux-kernel - Re: [PATCH v3] drm/display: Select DP helper for DRM_DP_AUX_CHARDEV and DRM_DP

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Date:   Thu, 28 Apr 2022 12:08:31 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Lyude Paul <lyude@...hat.com>
Cc:     David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3] drm/display: Select DP helper for DRM_DP_AUX_CHARDEV
 and DRM_DP_CEC

Hi

Am 28.04.22 um 11:11 schrieb Javier Martinez Canillas:
> On 4/28/22 10:42, Thomas Zimmermann wrote:
>> Hi
>>
> 
> [snip]
> 
>>>    drivers/gpu/drm/display/Kconfig | 6 ++++--
>>>    1 file changed, 4 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig
>>> index f84f1b0cd23f..1b6e6af37546 100644
>>> --- a/drivers/gpu/drm/display/Kconfig
>>> +++ b/drivers/gpu/drm/display/Kconfig
>>> @@ -31,7 +31,8 @@ config DRM_DISPLAY_HDMI_HELPER
>>>    
>>>    config DRM_DP_AUX_CHARDEV
>>>    	bool "DRM DP AUX Interface"
>>> -	depends on DRM
>>> +	depends on DRM && DRM_DISPLAY_HELPER
>>> +	select DRM_DISPLAY_DP_HELPER
>>
> 
> My rationale was that since DRM_DISPLAY_DP_HELPER is not a user-visible
> symbol but DRM_DP_{AUX_CHARDEV,CEC} are, the latter should be able to
> be enabled by the user without relying on other drivers to select the
> required symbols (I would argue that even should select DP_HELPER but
> that can't be done or otherwise the helper couldn't be built as module).
> 
> In other words, either DRM_DP_{AUX_CHARDEV,CEC} can be user selectable
> as a standalone symbol or can't and will only be visible if other driver
> selects their required symbols.
> 
> In which case, why not just do this non-user visible and just make the
> drivers using their helpers to select it directly? That is one of the
> options I proposed before.
> 
> So I believe this is the less intrusive change that will preserve the
> current behaviour as much as possible.

Makes sense.

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

Maybe wait a bit before landing, so that the actual maintainers have a 
chance to comment.

Best regards
Thomas

> 
> I don't have a strong opinion though and if you prefer I can change to
> be a depends instead.
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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