[PATCH 4/8] drm/amdgpu: Keep SDMAv4.4.2 active during reset

[Alex Deucher]

From: Lijo Lazar <lijo.lazar at amd.com>

During ASIC wide reset, SDMA shouldn't be clockgated and be ready to
accept freeze requests from PMFW. For that, don't stop SDMA engine
during reset and keep the clocks active.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
index 7c91cbd91ac8..729e26a4a2e7 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
@@ -566,6 +566,11 @@ static void sdma_v4_4_2_inst_enable(struct amdgpu_device *adev, bool enable,
 		sdma_v4_4_2_inst_rlc_stop(adev, inst_mask);
 		if (adev->sdma.has_page_queue)
 			sdma_v4_4_2_inst_page_stop(adev, inst_mask);
+
+		/* SDMA FW needs to respond to FREEZE requests during reset.
+		 * Keep it running during reset */
+		if (!amdgpu_sriov_vf(adev) && amdgpu_in_reset(adev))
+			return;
 	}
 
 	for_each_inst(i, inst_mask) {
@@ -1435,6 +1440,9 @@ static int sdma_v4_4_2_suspend(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+	if (amdgpu_in_reset(adev))
+		sdma_v4_4_2_set_clockgating_state(adev, AMD_CG_STATE_UNGATE);
+
 	return sdma_v4_4_2_hw_fini(adev);
 }
 
-- 
2.39.2