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

[Ryan Lin]

[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) {
+			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