[PATCH] drm/amd/display: add stub for crtc_debugfs_init()

[Randy Dunlap]

On 6/14/22 10:45, Harry Wentland wrote:
> On 2022-06-14 11:57, Randy Dunlap wrote:
>> Fix build error when CONFIG_DEBUG_FS is not enabled by adding a
>> stub function for crtc_debugfs_init().
>>
>> Eliminates this build error:
>>
>> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function ‘amdgpu_dm_crtc_late_register’:
>> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6599:2: error: implicit declaration of function ‘crtc_debugfs_init’; did you mean ‘amdgpu_debugfs_init’? [-Werror=implicit-function-declaration]
>>   crtc_debugfs_init(crtc);
>>   ^~~~~~~~~~~~~~~~~
>>   amdgpu_debugfs_init
>>
>> Fixes: 86bc22191892 ("drm/amd/display: Support crc on specific region")
> 
> That whole patch and the whole secure display feature depend on debugfs.
> It should never try building without CONFIG_DEBUG_FS.

Hi Harry,
Well, it's clearly possible to have this build error, so something needs
to be fixed somewhere.

> See drivers/gpu/drm/amd/display/Kconfig:
> 
>> config DRM_AMD_SECURE_DISPLAY
>>         bool "Enable secure display support"
>>         default n
>>         depends on DEBUG_FS
>>         depends on DRM_AMD_DC_DCN
>>         help
>>             Choose this option if you want to
>>             support secure display
>>
>>             This option enables the calculation
>>             of crc of specific region via debugfs.
>>             Cooperate with specific DMCU FW.
> 
> amdgpu_dm_crtc_late_register is guarded by CONIG_DRM_AMD_SECURE_DISPLAY.
> 
> Harry
> 
>> Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
>> Cc: Wayne Lin <Wayne.Lin at amd.com>
>> Cc: Alex Deucher <alexander.deucher at amd.com>
>> Cc: Christian König <christian.koenig at amd.com>
>> Cc: "Pan, Xinhui" <Xinhui.Pan at amd.com>
>> Cc: amd-gfx at lists.freedesktop.org
>> Cc: dri-devel at lists.freedesktop.org
>> ---
>>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c         |    2 --
>>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.h |    6 ++++++
>>  2 files changed, 6 insertions(+), 2 deletions(-)
>>
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -57,9 +57,7 @@
>>  #include "amdgpu_dm_irq.h"
>>  #include "dm_helpers.h"
>>  #include "amdgpu_dm_mst_types.h"
>> -#if defined(CONFIG_DEBUG_FS)
>>  #include "amdgpu_dm_debugfs.h"
>> -#endif
>>  #include "amdgpu_dm_psr.h"
>>  
>>  #include "ivsrcid/ivsrcid_vislands30.h"
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.h
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.h
>> @@ -31,6 +31,12 @@
>>  
>>  void connector_debugfs_init(struct amdgpu_dm_connector *connector);
>>  void dtn_debugfs_init(struct amdgpu_device *adev);
>> +
>> +#ifdef CONFIG_DEBUG_FS
>>  void crtc_debugfs_init(struct drm_crtc *crtc);
>> +#else
>> +static inline void crtc_debugfs_init(struct drm_crtc *crtc)
>> +{}
>> +#endif
>>  
>>  #endif
> 

thanks.
-- 
~Randy