From: Arindam Nath <arindam.nath@amd.com>
Date: Fri, 7 Oct 2016 13:31:37 +0000 (+0530)
Subject: drm/amd/amdgpu: enable clockgating only after late init
X-Git-Tag: v4.9-rc2~40^2~1^2~14
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=b0b00ff16f2715562b7ea0dfa3a9c5b33328c8cb;p=linux-2.6-block.git

drm/amd/amdgpu: enable clockgating only after late init

Sometimes during multiple reboots, the system hangs
during bootup. The issue is very random and happens
once in around 50 reboots or so.

It seems if clockgating is enabled before late init,
the GFX engine sometimes does not respond.

This patch changes the ordering a little so that
both powergating and clockgating are enabled only
after late init calls.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Tested-by: Sunil Uttarwar <Sunil.Uttarwar1@amd.com>
Reviewed-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index a58513f271e3..928774f5a7e0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1411,13 +1411,6 @@ static int amdgpu_late_init(struct amdgpu_device *adev)
 		if (adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_UVD ||
 			adev->ip_blocks[i].type == AMD_IP_BLOCK_TYPE_VCE)
 			continue;
-		/* enable clockgating to save power */
-		r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
-								    AMD_CG_STATE_GATE);
-		if (r) {
-			DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
-			return r;
-		}
 		if (adev->ip_blocks[i].funcs->late_init) {
 			r = adev->ip_blocks[i].funcs->late_init((void *)adev);
 			if (r) {
@@ -1426,6 +1419,13 @@ static int amdgpu_late_init(struct amdgpu_device *adev)
 			}
 			adev->ip_block_status[i].late_initialized = true;
 		}
+		/* enable clockgating to save power */
+		r = adev->ip_blocks[i].funcs->set_clockgating_state((void *)adev,
+								    AMD_CG_STATE_GATE);
+		if (r) {
+			DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n", adev->ip_blocks[i].funcs->name, r);
+			return r;
+		}
 	}
 
 	return 0;