[PATCH] drm/amd/display: call amdgpu_dm_fini whewn hw_fini.

[Rex.Zhu@xxxxxxx (Rex Zhu)]

to free up drm mode_config info.

fix issue: unload amdgpu, can't load amdgpu again.

Change-Id: I493bc923b039eae69717cbe8a85c8f3f3ea97465
[drm:drm_debugfs_init [drm]] *ERROR* Cannot create /sys/kernel/debug/dri/0
[drm:drm_minor_register [drm]] *ERROR* DRM: Failed to initialize /sys/kernel/debug/dri.

Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++---
 drivers/gpu/drm/amd/display/dc/core/dc.c          | 7 ++++++-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index e39aef6..2774f86 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -393,9 +393,8 @@ void amdgpu_dm_fini(struct amdgpu_device *adev)
 		adev->dm.freesync_module = NULL;
 	}
 	/* DC Destroy TODO: Replace destroy DAL */
-	{
+	if (adev->dm.dc)
 		dc_destroy(&adev->dm.dc);
-	}
 	return;
 }
 
@@ -488,7 +487,7 @@ static int dm_hw_fini(void *handle)
 	amdgpu_dm_hpd_fini(adev);
 
 	amdgpu_dm_irq_fini(adev);
-
+	amdgpu_dm_fini(adev);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 8106e01..8e1b573 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1583,7 +1583,12 @@ enum dc_irq_source dc_interrupt_to_irq_source(
 
 void dc_interrupt_set(const struct dc *dc, enum dc_irq_source src, bool enable)
 {
-	struct core_dc *core_dc = DC_TO_CORE(dc);
+	struct core_dc *core_dc;
+
+	if (dc == NULL)
+		return;
+	core_dc = DC_TO_CORE(dc);
+
 	dal_irq_service_set(core_dc->res_pool->irqs, src, enable);
 }
 
-- 
1.9.1