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

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Message-ID: <23074b44-27c9-ccab-dc72-c2231947bb30@redhat.com>
Date:   Wed, 27 Apr 2022 23:29:49 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Lyude Paul <lyude@...hat.com>, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/display: Select DP helpers for DRM_DP_AUX_CHARDEV and
 DRM_DP_CEC

On 4/27/22 22:25, Javier Martinez Canillas wrote:
> The DRM_DP_AUX_CHARDEV and DRM_DP_CEC boolean Kconfig symbols enable code
> that use DP helper functions, exported by the display-helper module.
> 

[snip]

> @@ -32,6 +32,8 @@ config DRM_DISPLAY_HDMI_HELPER
>  config DRM_DP_AUX_CHARDEV
>  	bool "DRM DP AUX Interface"
>  	depends on DRM
> +	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_HELPER

Actually, this is wrong since it will prevent DRM_DISPLAY_HELPER to be set
as a module (it's tristate while this symbol is bool). I now have a better
understanding of the problem and a patch that I believe is the correct one.

I'll post a v2 soon.

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat