Issue: On host P520 with S03J3226A SBIOS platform, passthrough both
gfx and audio device to VM, the first time start VM after host bootup,
driver woule load fail.
Root cause: Passthrough both devices allows VFIO to do hot reset
on bridge, this reset clears register BIOS_SCRATCH_7 which is used
for judging if VBIOS has been post. Since in the first time driver
does not do BACO reset when loading, VBIOS would be post twice.
Solution: When running in passthrough mode, force enable BACO reset
in every time loading driver.
Notice: This is a workaround for SWDEV-187506 issue, passthrough two
devices to VM is required.
Signed-off-by: Jesse Zhang <zhexi.zhang@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/soc15.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
index 9d33ba4..790099d 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -738,15 +738,16 @@ static bool soc15_need_reset_on_init(struct amdgpu_device *adev)
{
u32 sol_reg;
- if (!amdgpu_passthrough(adev))
- return false;
-
if (adev->flags & AMD_IS_APU)
return false;
/* Check sOS sign of life register to confirm sys driver and sOS
* are already been loaded.
*/
+
+ if (amdgpu_passthrough(adev))
+ return true;
+
sol_reg = RREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_81);
if (sol_reg)
return true;
--
2.7.4
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