From 4bd3eaf206048d01047c8226594f9efd2c628547 Mon Sep 17 00:00:00 2001
From: "Jerry (Fangzhi) Zuo" <Jerry.Zuo@amd.com>
Date: Fri, 24 Apr 2020 14:09:23 -0400
Subject: drm/amd/display: Check DMCU Exists Before Loading
Git-commit: 17bdb4a82fe5014c8aa5b2103c80c5729744a096
Patch-mainline: v5.8-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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 f09e664574d9..bb400694cf34 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1338,9 +1338,14 @@ static int dm_late_init(void *handle)
struct dmcu_iram_parameters params;
unsigned int linear_lut[16];
int i;
- struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
+ struct dmcu *dmcu = NULL;
bool ret = false;
+ if (!adev->dm.fw_dmcu)
+ return detect_mst_link_for_all_connectors(adev->ddev);
+
+ dmcu = adev->dm.dc->res_pool->dmcu;
+
for (i = 0; i < 16; i++)
linear_lut[i] = 0xFFFF * i / 15;
--
2.28.0