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

[VURDIGERENATARAJ, CHANDAN]

Hi Ryan,

Is this change applicable on a specific kernel version?
On latest I see IP DISCOVERY based impl for CHIP_RAVEN.

>[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.
>
>v2:
>   - remove unnecessary comments and Id
>
>Signed-off-by: Ryan Lin <tsung-hua.lin at amd.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) {

May I know what this ">=8" indicate? Also, should it be external_rev_id if its based on old version?

>+			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
>

BR,
Chandan V N