[PATCH 356/459] drm/amd/display: disable dcn20 abm feature for bring up

[Alex Deucher]

From: hersen wu <hersenxs.wu at amd.com>

[WHY] dcn20 enable usb-c dp ALT mode in dmcu. There is bug
when enable abm feature which cause system crash. dal team
will debug this bug later.

[HOW] disable dcn abm feature for dcn20.

Signed-off-by: hersen wu <hersenxs.wu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 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 27c57267e295..d20250b181b7 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -781,7 +781,7 @@ static int dm_late_init(void *handle)
 	unsigned int linear_lut[16];
 	int i;
 	struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
-	bool ret;
+	bool ret = false;
 
 	for (i = 0; i < 16; i++)
 		linear_lut[i] = 0xFFFF * i / 15;
@@ -792,10 +792,13 @@ static int dm_late_init(void *handle)
 	params.backlight_lut_array_size = 16;
 	params.backlight_lut_array = linear_lut;
 
-	ret = dmcu_load_iram(dmcu, params);
+	/* todo will enable for navi10 */
+	if (adev->asic_type <= CHIP_RAVEN) {
+		ret = dmcu_load_iram(dmcu, params);
 
-	if (!ret)
-		return -EINVAL;
+		if (!ret)
+			return -EINVAL;
+	}
 
 	return detect_mst_link_for_all_connectors(adev->ddev);
 }
-- 
2.20.1