linux-kernel - Re: [PATCH] drm/panel: r66451: select CONFIG_DRM_DISPLAY_DP

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Date:   Wed, 19 Jul 2023 11:56:55 -0700
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
CC:     Arnd Bergmann <arnd@...db.de>, Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/panel: r66451: select CONFIG_DRM_DISPLAY_DP_HELPER



On 7/19/2023 6:09 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added driver only builds when DRM_DISPLAY_DP_HELPER is enabled:
> 
> x86_64-linux-ld: drivers/gpu/drm/panel/panel-visionox-r66451.o: in function `visionox_r66451_enable':
> panel-visionox-r66451.c:(.text+0x105): undefined reference to `drm_dsc_pps_payload_pack'
> 
> Select both CONFIG_DRM_DISPLAY_DP_HELPER and CONFIG_DRM_DISPLAY_HELPER to
> ensure the helper function is always available.

Hi Arnd,

Thanks for catching this -- hadn't seen this issue due to DRM_MSM 
selecting both configs already.

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

Thanks,

Jessica Zhang

> 
> Fixes: a6dfab2738fc2 ("drm/panel: Add driver for Visionox r66451 panel")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/gpu/drm/panel/Kconfig | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 1a0fd0754692e..e8c9f4613a4b4 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -798,6 +798,8 @@ config DRM_PANEL_VISIONOX_R66451
>   	depends on OF
>   	depends on DRM_MIPI_DSI
>   	depends on BACKLIGHT_CLASS_DEVICE
> +	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_HELPER
>   	help
>   	  Say Y here if you want to enable support for Visionox
>   	  R66451 1080x2340 AMOLED DSI panel.
> -- 
> 2.39.2
>