drm/amdgpu: Disable VGA render and crtc when init GMC.

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.

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>

1 files changed, 48 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
index 4fdfab1e9200..e4467b8ff40c 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -604,6 +604,52 @@ static void dce_v8_0_set_vga_render_state(struct amdgpu_device *adev,
         WREG32(mmVGA_RENDER_CONTROL, tmp);
 }
 
+static int dce_v8_0_get_num_crtc(struct amdgpu_device *adev)
+{
+        int num_crtc = 0;
+
+        switch (adev->asic_type) {
+        case CHIP_BONAIRE:
+        case CHIP_HAWAII:
+                num_crtc = 6;
+                break;
+        case CHIP_KAVERI:
+                num_crtc = 4;
+                break;
+        case CHIP_KABINI:
+        case CHIP_MULLINS:
+                num_crtc = 2;
+                break;
+        default:
+                num_crtc = 0;
+        }
+        return num_crtc;
+}
+
+void dce_v8_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_v8_0_set_vga_render_state(adev, false);
+
+                /*Disable crtc*/
+                for (i = 0; i < dce_v8_0_get_num_crtc(adev); i++) {
+                        crtc_enabled = REG_GET_FIELD(RREG32(mmCRTC_CONTROL + crtc_offsets[i]),
+                                                                         CRTC_CONTROL, CRTC_MASTER_EN);
+                        if (crtc_enabled) {
+                                WREG32(mmCRTC_UPDATE_LOCK + crtc_offsets[i], 1);
+                                tmp = RREG32(mmCRTC_CONTROL + crtc_offsets[i]);
+                                tmp = REG_SET_FIELD(tmp, CRTC_CONTROL, CRTC_MASTER_EN, 0);
+                                WREG32(mmCRTC_CONTROL + crtc_offsets[i], tmp);
+                                WREG32(mmCRTC_UPDATE_LOCK + crtc_offsets[i], 0);
+                        }
+                }
+        }
+}
+
 static void dce_v8_0_program_fmt(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
@@ -2803,21 +2849,20 @@ static int dce_v8_0_early_init(void *handle)
         dce_v8_0_set_display_funcs(adev);
         dce_v8_0_set_irq_funcs(adev);
 
+        adev->mode_info.num_crtc = dce_v8_0_get_num_crtc(adev);
+
         switch (adev->asic_type) {
         case CHIP_BONAIRE:
         case CHIP_HAWAII:
-                adev->mode_info.num_crtc = 6;
                 adev->mode_info.num_hpd = 6;
                 adev->mode_info.num_dig = 6;
                 break;
         case CHIP_KAVERI:
-                adev->mode_info.num_crtc = 4;
                 adev->mode_info.num_hpd = 6;
                 adev->mode_info.num_dig = 7;
                 break;
         case CHIP_KABINI:
         case CHIP_MULLINS:
-                adev->mode_info.num_crtc = 2;
                 adev->mode_info.num_hpd = 6;
                 adev->mode_info.num_dig = 6; /* ? */
                 break;