drm/amdgpu: To define whether the GPU has DCE engine.

For virtual display feature, when the GPU has DCE engine, need to disable
the VGA render and CRTC, or it will hang when initialize GMC. So first detect
whether the GPU has DCE engine.

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
index 983175363b0688df6ca181e612000173da9141bf..1b621160b52e5ae5db1b21888e380873d6f0d73e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
@@ -259,6 +259,33 @@ static const int object_connector_convert[] = {
        DRM_MODE_CONNECTOR_Unknown
 };
 
+bool amdgpu_atombios_has_dce_engine_info(struct amdgpu_device *adev)
+{
+       struct amdgpu_mode_info *mode_info = &adev->mode_info;
+       struct atom_context *ctx = mode_info->atom_context;
+       int index = GetIndexIntoMasterTable(DATA, Object_Header);
+       u16 size, data_offset;
+       u8 frev, crev;
+       ATOM_DISPLAY_OBJECT_PATH_TABLE *path_obj;
+       ATOM_OBJECT_HEADER *obj_header;
+
+       if (!amdgpu_atom_parse_data_header(ctx, index, &size, &frev, &crev, &data_offset))
+               return false;
+
+       if (crev < 2)
+               return false;
+
+       obj_header = (ATOM_OBJECT_HEADER *) (ctx->bios + data_offset);
+       path_obj = (ATOM_DISPLAY_OBJECT_PATH_TABLE *)
+           (ctx->bios + data_offset +
+            le16_to_cpu(obj_header->usDisplayPathTableOffset));
+
+       if (path_obj->ucNumOfDispPath)
+               return true;
+       else
+               return false;
+}
+
 bool amdgpu_atombios_get_connector_info_from_object_table(struct amdgpu_device *adev)
 {
        struct amdgpu_mode_info *mode_info = &adev->mode_info;

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h
index 8c2e69661799d0db7b390b00a48edade2b784cff..15dd43ec38bb6ae89d23334279f254e419b709b3 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h
@@ -140,6 +140,8 @@ struct amdgpu_i2c_bus_rec amdgpu_atombios_lookup_i2c_gpio(struct amdgpu_device *
                                                          uint8_t id);
 void amdgpu_atombios_i2c_init(struct amdgpu_device *adev);
 
+bool amdgpu_atombios_has_dce_engine_info(struct amdgpu_device *adev);
+
 bool amdgpu_atombios_get_connector_info_from_object_table(struct amdgpu_device *adev);
 
 int amdgpu_atombios_get_clock_info(struct amdgpu_device *adev);