[PATCH v2] drm/amd/display: enable S/G display for for recent APUs by default

[Yifan Zhang]

With S/G display becomes stable, enable S/G display for recent APUs
by default rather than white list.

v2: explicitly disable sg on pre-CZ chips (Alex)

Co-authored-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Yifan Zhang <yifan1.zh...@amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 47 ++++++-------------
 1 file changed, 14 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 8e5dfdee22e6..8963d9c251f3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1627,41 +1627,22 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
                break;
        }
 
-       switch (adev->asic_type) {
-       case CHIP_CARRIZO:
-       case CHIP_STONEY:
-               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))
+       /* APU support S/G display by default except:
+        * ASICs before Carrizo,
+        * RAVEN1 (Users repored stability issue)
+        */
+
+       if (adev->asic_type < CHIP_CARRIZO)
                init_data.flags.gpu_vm_support = false;
+       else if (adev->asic_type == CHIP_RAVEN) {
+               if (adev->apu_flags & AMD_APU_IS_RAVEN)
+                       init_data.flags.gpu_vm_support = false;
+               else
+                       init_data.flags.gpu_vm_support = (amdgpu_sg_display != 
0);
+       } else
+               init_data.flags.gpu_vm_support = (amdgpu_sg_display != 0) && 
(adev->flags & AMD_IS_APU);
 
-       if (init_data.flags.gpu_vm_support)
-               adev->mode_info.gpu_vm_support = true;
+       init_data.flags.gpu_vm_support = adev->mode_info.gpu_vm_support;
 
        if (amdgpu_dc_feature_mask & DC_FBC_MASK)
                init_data.flags.fbc_support = true;
-- 
2.37.3