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drm/amdgpu: Reset dGPU if suspend got aborted 

For SOC21 ASICs, there is an issue in re-enabling PM features if a
suspend got aborted. In such cases, reset the device during resume
phase. This is a workaround till a proper solution is finalized.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Lijo Lazar 2024-02-14 17:55:54 +05:30 committed by Alex Deucher
parent 0f1bbcc2ba
commit 8b2be55f4d
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/amd/amdgpu/soc21.c
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@ -867,10 +867,35 @@ static int soc21_common_suspend(void *handle)
return soc21_common_hw_fini(adev);
}
static bool soc21_need_reset_on_resume(struct amdgpu_device *adev)
{
u32 sol_reg1, sol_reg2;
/* Will reset for the following suspend abort cases.
* 1) Only reset dGPU side.
* 2) S3 suspend got aborted and TOS is active.
*/
if (!(adev->flags & AMD_IS_APU) && adev->in_s3 &&
!adev->suspend_complete) {
sol_reg1 = RREG32_SOC15(MP0, 0, regMP0_SMN_C2PMSG_81);
msleep(100);
sol_reg2 = RREG32_SOC15(MP0, 0, regMP0_SMN_C2PMSG_81);
return (sol_reg1 != sol_reg2);
}
return false;
}
static int soc21_common_resume(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
if (soc21_need_reset_on_resume(adev)) {
dev_info(adev->dev, "S3 suspend aborted, resetting...");
soc21_asic_reset(adev);
}
return soc21_common_hw_init(adev);
}