drm/amdgpu/dce6: add dce_v6_0_disable_dce

Needed for virtual dce support
Reviewed-By: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/dce_v6_0.c

@@ -617,6 +617,49 @@ static void dce_v6_0_set_vga_render_state(struct amdgpu_device *adev,
 
 }
 
+static int dce_v6_0_get_num_crtc(struct amdgpu_device *adev)
+{
+	int num_crtc = 0;
+
+	switch (adev->asic_type) {
+	case CHIP_TAHITI:
+	case CHIP_PITCAIRN:
+	case CHIP_VERDE:
+		num_crtc = 6;
+		break;
+	case CHIP_OLAND:
+		num_crtc = 2;
+		break;
+	default:
+		num_crtc = 0;
+	}
+	return num_crtc;
+}
+
+void dce_v6_0_disable_dce(struct amdgpu_device *adev)
+{
+	/*Disable VGA render and enabled crtc, if has DCE engine*/
+	if (amdgpu_atombios_has_dce_engine_info(adev)) {
+		u32 tmp;
+		int crtc_enabled, i;
+
+		dce_v6_0_set_vga_render_state(adev, false);
+
+		/*Disable crtc*/
+		for (i = 0; i < dce_v6_0_get_num_crtc(adev); i++) {
+			crtc_enabled = RREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i]) &
+				EVERGREEN_CRTC_MASTER_EN;
+			if (crtc_enabled) {
+				WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 1);
+				tmp = RREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i]);
+				tmp &= ~EVERGREEN_CRTC_MASTER_EN;
+				WREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i], tmp);
+				WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 0);
+			}
+		}
+	}
+}
+
 static void dce_v6_0_program_fmt(struct drm_encoder *encoder)
 {
 
@@ -2338,21 +2381,20 @@ static int dce_v6_0_early_init(void *handle)
 	dce_v6_0_set_display_funcs(adev);
 	dce_v6_0_set_irq_funcs(adev);
 
+	adev->mode_info.num_crtc = dce_v6_0_get_num_crtc(adev);
+
 	switch (adev->asic_type) {
 	case CHIP_TAHITI:
 	case CHIP_PITCAIRN:
 	case CHIP_VERDE:
-		adev->mode_info.num_crtc = 6;
 		adev->mode_info.num_hpd = 6;
 		adev->mode_info.num_dig = 6;
 		break;
 	case CHIP_OLAND:
-		adev->mode_info.num_crtc = 2;
 		adev->mode_info.num_hpd = 2;
 		adev->mode_info.num_dig = 2;
 		break;
 	default:
-		/* FIXME: not supported yet */
 		return -EINVAL;
 	}
 

drivers/gpu/drm/amd/amdgpu/dce_v6_0.h

@@ -26,4 +26,6 @@
 
 extern const struct amd_ip_funcs dce_v6_0_ip_funcs;
 
+void dce_v6_0_disable_dce(struct amdgpu_device *adev);
+
 #endif