[PATCH] drm/amdgpu: force exit gfxoff on sdma resume for rmb s0ix

[Prike Liang <Prike.Liang@amd.com>]

In the s2idle stress test sdma resume fail occasionally,in the
failed case GPU is in the gfxoff state.This issue may introduce
by FSDL miss handle doorbell S/R and now temporary fix the issue
by forcing exit gfxoff for sdma resume.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index 24b0195..af759ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -7608,6 +7608,14 @@ static int gfx_v10_0_suspend(void *handle)
 
 static int gfx_v10_0_resume(void *handle)
 {
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	/* TODO: check whether can submit a doorbell request to raise
+	 * a doorbell fence to exit gfxoff.
+	 */
+	if (adev->in_s0ix)
+		amdgpu_gfx_off_ctrl(adev, false);
+
 	return gfx_v10_0_hw_init(handle);
 }
 
@@ -7819,6 +7827,9 @@ static int gfx_v10_0_late_init(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int r;
 
+	if (adev->in_s0ix)
+		 amdgpu_gfx_off_ctrl(adev, true);
+
 	r = amdgpu_irq_get(adev, &adev->gfx.priv_reg_irq, 0);
 	if (r)
 		return r;
-- 
2.7.4