linux-kernel - Re: [PATCH] drm/panel: s6e3ha8: select CONFIG_DRM_DISPLAY_DSC

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Message-Id: <b0b7a36e-0327-4ee0-ac03-7aef6b4f4e87@app.fastmail.com>
Date: Tue, 15 Oct 2024 15:34:33 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Ruan Jinjie" <ruanjinjie@...wei.com>, "Arnd Bergmann" <arnd@...nel.org>,
 "Neil Armstrong" <neil.armstrong@...aro.org>,
 "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
 "Maxime Ripard" <mripard@...nel.org>,
 "Thomas Zimmermann" <tzimmermann@...e.de>, "Dave Airlie" <airlied@...il.com>,
 "Simona Vetter" <simona@...ll.ch>, "Dzmitry Sankouski" <dsankouski@...il.com>
Cc: "Jessica Zhang" <quic_jesszhan@...cinc.com>,
 "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: s6e3ha8: select CONFIG_DRM_DISPLAY_DSC_HELPER

On Tue, Oct 15, 2024, at 07:52, Jinjie Ruan wrote:
> On 2024/10/15 15:30, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> The new driver needs the dsc helper code to be available:
>> 
>> x86_64-linux-ld: vmlinux.o: in function `s6e3ha8_amb577px01_wqhd_prepare':
>> panel-samsung-s6e3ha8.c:(.text+0x16b1e65): undefined reference to `drm_dsc_pps_payload_pack'
>> 
>> Select it from Kconfig as we do for other similar drivers.
>> 
>> Fixes: 779679d3c164 ("drm/panel: Add support for S6E3HA8 panel driver")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/gpu/drm/panel/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
>> index ddfaa99ea9dd..ffe7eff71496 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -626,6 +626,7 @@ config DRM_PANEL_SAMSUNG_AMS639RQ08
>>  config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
>>  	tristate "Samsung AMS452EF01 panel with S6E88A0 DSI video mode controller"
>>  	depends on OF
>> +	select DRM_DISPLAY_DSC_HELPER
>
> It seems that it uses DRM_DISPLAY_DP_HELPER in mainline but use
> DRM_DISPLAY_DSC_HELPER in next.
>

I think I made a mistake during rebasing and ended up having
the 'select' under the wrong Kconfig symbol.

The new driver DRM_PANEL_SAMSUNG_S6E3HA8 was only added in
linux-next and does not exist in mainline yet.

Sending a new version now.

      Arnd