On Thu, Jan 27, 2022 at 3:12 AM RyanLin <Tsung-Hua.Lin@xxxxxxx> wrote:
>
> [Why]
> External displays take priority over internal display when there are fewer
> display controllers than displays.
>
> [How]
> The root cause is because of that number of the crtc is not correct.
> 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.
>
> Signed-off-by: RyanLin <Tsung-Hua.Lin@xxxxxxx>
> Change-Id: I837df7101cc4849d2c3021fd529b4061edab4bb1
Please drop the gerrit ID.
> ---
> 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 40c91b448f7d..dbeef7b57a9b 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) { //chip_name = "raven2";
> + 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)
> --
> 2.25.1
>
