linux-kernel - Re: [PATCH v2] drm/amdgpu: fix that issue that the number of the crtc of the 3250c is not correct

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Date:   Wed, 30 Mar 2022 08:36:22 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Ryan Lin <tsung-hua.lin@....com>
Cc:     Stéphane Marchesin <marcheu@...omium.org>,
        Leo Li <sunpeng.li@....com>, leon.li@....com,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        David Airlie <airlied@...ux.ie>,
        Sean Paul <seanpaul@...omium.org>,
        amd-gfx@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Drew Davenport <ddavenport@...omium.org>,
        Alex Deucher <alexander.deucher@....com>,
        Mark Yacoub <markyacoub@...gle.com>,
        Harry Wentland <harry.wentland@....com>,
        Christian König <christian.koenig@....com>,
        Louis Li <ching-shih.li@....corp-partner.google.com>
Subject: Re: [PATCH v2] drm/amdgpu: fix that issue that the number of the crtc
 of the 3250c is not correct

[Cc: Remove undeliverable Chun Ming Zhou <mailto:David1.Zhou@....com>]

Am 30.03.22 um 08:34 schrieb Paul Menzel:
> Dear Tsung-Hua,
> 
> 
> Thank you for your patch.
> 
> Am 30.03.22 um 04:46 schrieb Ryan Lin:
> 
> The commit message summary is quite long and confusing. Maybe:
> 
> Use 3 CRTC for 3250c to get internal display working
> 
>> [Why]
>> External displays take priority over internal display when there are 
>> fewer
>> display controllers than displays.
> 
> This causes the internal display to not work on the Chromebook google/zork.
> 
>> [How]
>> The root cause is because of that number of the crtc is not correct.
> 
> The root cause is the incorrect number of four configured CRTCs.
> 
>> The number of the crtc on the 3250c is 3, but on the 3500c is 4.
>> On the source code, we can see that number of the crtc has been fixed 
>> at 4.
>> Needs to set the num_crtc to 3 for 3250c platform.
> 
> Please do not wrap lines after each sentence, and use a text width of 75 
> characters.
> 
>> v2:
>>     - remove unnecessary comments and Id
>>
>> Signed-off-by: Ryan Lin <tsung-hua.lin@....com>
>>
>> ---
>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 +++++++++---
>>   1 file changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
>> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 40c91b448f7da..455a2c45e8cda 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -2738,9 +2738,15 @@ static int dm_early_init(void *handle)
>>           break;
>>   #if defined(CONFIG_DRM_AMD_DC_DCN1_0)
>>       case CHIP_RAVEN:
>> -        adev->mode_info.num_crtc = 4;
>> -        adev->mode_info.num_hpd = 4;
>> -        adev->mode_info.num_dig = 4;
>> +        if (adev->rev_id >= 8) {
> 
> Is there some define for that number? Maybe add a comment, that it’s for 
> 3250c?
> 
> 
> Kind regards,
> 
> Paul
> 
> 
>> +            adev->mode_info.num_crtc = 3;
>> +            adev->mode_info.num_hpd = 3;
>> +            adev->mode_info.num_dig = 3;
>> +        } else {
>> +            adev->mode_info.num_crtc = 4;
>> +            adev->mode_info.num_hpd = 4;
>> +            adev->mode_info.num_dig = 4;
>> +        }
>>           break;
>>   #endif
>>   #if defined(CONFIG_DRM_AMD_DC_DCN2_0)