drm/amd: fix gfx hang on renoir in IGT reload test

[why]
CP hangs in igt reloading test on renoir, more precisely, hangs on the
second time insmod.

[how]
mode2 reset can make it recover, and mode2 reset only effects gfx core,
dcn and the screen will not be impacted.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Tianci.Yin <tianci.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index 496c4a6..3d0251e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -853,6 +853,10 @@ static bool soc15_need_reset_on_init(struct amdgpu_device *adev)
 {
        u32 sol_reg;
 
+       /* CP hangs in IGT reloading test on RN, reset to WA */
+       if (adev->asic_type == CHIP_RENOIR)
+               return true;
+
        /* Just return false for soc15 GPUs.  Reset does not seem to
         * be necessary.
         */