[PATCH] drm/amd/display: enable S/G display for for recent APUs by default

[Christian König]

Am 27.09.23 um 07:41 schrieb Yifan Zhang:
> With S/G display becomes stable, enable S/G display for recent APUs
> by default rather than white list.
>
> Signed-off-by: Yifan Zhang <yifan1.zhang at amd.com>
> ---
>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 43 +++++--------------
>   1 file changed, 10 insertions(+), 33 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 7e6a693d6369..241fd8defdee 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1626,41 +1626,18 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>   		break;
>   	}
>   
> -	switch (adev->asic_type) {
> -	case CHIP_CARRIZO:
> -	case CHIP_STONEY:
> +	if ((adev->asic_type == CHIP_CARRIZO ||
> +		adev->asic_type == CHIP_STONEY ||
> +		((adev->flags & AMD_IS_APU) &&
> +		amdgpu_ip_version(adev, DCE_HWIP, 0) >= IP_VERSION(1, 0, 0) &&
> +		!(adev->apu_flags & AMD_APU_IS_RAVEN))) &&
> +		amdgpu_sg_display != 0) {

Looks like a good idea to me, but please double check your coding style 
settings. The second line of an "if (" should be indented so that it 
starts after the "(" of the previous line.

Additional to that this check actually looks quite messy to me and 
should probably be converted to always using the IP version instead of 
the asic_type.

Regards,
Christian.

>   		init_data.flags.gpu_vm_support = true;
> -		break;
> -	default:
> -		switch (amdgpu_ip_version(adev, DCE_HWIP, 0)) {
> -		case IP_VERSION(1, 0, 0):
> -		case IP_VERSION(1, 0, 1):
> -			/* enable S/G on PCO and RV2 */
> -			if ((adev->apu_flags & AMD_APU_IS_RAVEN2) ||
> -			    (adev->apu_flags & AMD_APU_IS_PICASSO))
> -				init_data.flags.gpu_vm_support = true;
> -			break;
> -		case IP_VERSION(2, 1, 0):
> -		case IP_VERSION(3, 0, 1):
> -		case IP_VERSION(3, 1, 2):
> -		case IP_VERSION(3, 1, 3):
> -		case IP_VERSION(3, 1, 4):
> -		case IP_VERSION(3, 1, 5):
> -		case IP_VERSION(3, 1, 6):
> -		case IP_VERSION(3, 5, 0):
> -			init_data.flags.gpu_vm_support = true;
> -			break;
> -		default:
> -			break;
> -		}
> -		break;
> -	}
> -	if (init_data.flags.gpu_vm_support &&
> -	    (amdgpu_sg_display == 0))
> -		init_data.flags.gpu_vm_support = false;
> -
> -	if (init_data.flags.gpu_vm_support)
>   		adev->mode_info.gpu_vm_support = true;
> +	} else {
> +		init_data.flags.gpu_vm_support = false;
> +		adev->mode_info.gpu_vm_support = false;
> +	}
>   
>   	if (amdgpu_dc_feature_mask & DC_FBC_MASK)
>   		init_data.flags.fbc_support = true;