[PATCH 3/3] amdgpu/pm: set pp_dpm_dcefclk to readonly on smu_v11 gpus

[Darren Powell]

Writing to dcefclk causes the gpu to become unresponsive, and requires a reboot.
Patch prevents user from successfully writing to file pp_dpm_dcefclk on smu_vv11
parts and gives better user feedback that this operation is not allowed.

Signed-off-by: Darren Powell <darren.powell at amd.com>
---
 drivers/gpu/drm/amd/pm/amdgpu_pm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 204e34549013..317e9b47db53 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -1891,6 +1891,19 @@ static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_
 		}
 	}
 
+	if (DEVICE_ATTR_IS(pp_dpm_dcefclk)) {
+		/* SMU MP1 does not support dcefclk level setting */
+		if (asic_type == CHIP_NAVI10          ||
+		    asic_type == CHIP_NAVI14          ||
+		    asic_type == CHIP_NAVI12          ||
+		    asic_type == CHIP_SIENNA_CICHLID  ||
+		    asic_type == CHIP_NAVY_FLOUNDER   ||
+		    asic_type == CHIP_DIMGREY_CAVEFISH  ) {
+			dev_attr->attr.mode &= ~S_IWUGO;
+			dev_attr->store = NULL;
+		}
+	}
+
 #undef DEVICE_ATTR_IS
 
 	return 0;
-- 
2.25.1