drm/amdgpu: Remove ATC L2 access for MMHUB 2.1.x

MMHUB 2.1.x versions don't have ATCL2. Remove accesses to ATCL2 registers.

Since they are non-existing registers, read access will cause a
'Completer Abort' and gets reported when AER is enabled with the below patch.
Tagging with the patch so that this is backported along with it.

v2: squash in uninitialized warning fix (Nathan Chancellor)

Fixes: 8795e182b02d ("PCI/portdrv: Don't disable AER reporting in get_port_device_capability()")

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
index 4d304f2..998b5d1 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
@@ -32,8 +32,6 @@
 #include "gc/gc_10_1_0_offset.h"
 #include "soc15_common.h"
 
-#define mmMM_ATC_L2_MISC_CG_Sienna_Cichlid                      0x064d
-#define mmMM_ATC_L2_MISC_CG_Sienna_Cichlid_BASE_IDX             0
 #define mmDAGB0_CNTL_MISC2_Sienna_Cichlid                       0x0070
 #define mmDAGB0_CNTL_MISC2_Sienna_Cichlid_BASE_IDX              0
 
@@ -574,7 +572,6 @@ static void mmhub_v2_0_update_medium_grain_clock_gating(struct amdgpu_device *ad
        case IP_VERSION(2, 1, 0):
        case IP_VERSION(2, 1, 1):
        case IP_VERSION(2, 1, 2):
-               def  = data  = RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG_Sienna_Cichlid);
                def1 = data1 = RREG32_SOC15(MMHUB, 0, mmDAGB0_CNTL_MISC2_Sienna_Cichlid);
                break;
        default:
@@ -608,8 +605,6 @@ static void mmhub_v2_0_update_medium_grain_clock_gating(struct amdgpu_device *ad
        case IP_VERSION(2, 1, 0):
        case IP_VERSION(2, 1, 1):
        case IP_VERSION(2, 1, 2):
-               if (def != data)
-                       WREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG_Sienna_Cichlid, data);
                if (def1 != data1)
                        WREG32_SOC15(MMHUB, 0, mmDAGB0_CNTL_MISC2_Sienna_Cichlid, data1);
                break;
@@ -634,8 +629,8 @@ static void mmhub_v2_0_update_medium_grain_light_sleep(struct amdgpu_device *ade
        case IP_VERSION(2, 1, 0):
        case IP_VERSION(2, 1, 1):
        case IP_VERSION(2, 1, 2):
-               def  = data  = RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG_Sienna_Cichlid);
-               break;
+               /* There is no ATCL2 in MMHUB for 2.1.x */
+               return;
        default:
                def  = data  = RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG);
                break;
@@ -646,18 +641,8 @@ static void mmhub_v2_0_update_medium_grain_light_sleep(struct amdgpu_device *ade
        else
                data &= ~MM_ATC_L2_MISC_CG__MEM_LS_ENABLE_MASK;
 
-       if (def != data) {
-               switch (adev->ip_versions[MMHUB_HWIP][0]) {
-               case IP_VERSION(2, 1, 0):
-               case IP_VERSION(2, 1, 1):
-               case IP_VERSION(2, 1, 2):
-                       WREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG_Sienna_Cichlid, data);
-                       break;
-               default:
-                       WREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG, data);
-                       break;
-               }
-       }
+       if (def != data)
+               WREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG, data);
 }
 
 static int mmhub_v2_0_set_clockgating(struct amdgpu_device *adev,
@@ -695,7 +680,10 @@ static void mmhub_v2_0_get_clockgating(struct amdgpu_device *adev, u64 *flags)
        case IP_VERSION(2, 1, 0):
        case IP_VERSION(2, 1, 1):
        case IP_VERSION(2, 1, 2):
-               data  = RREG32_SOC15(MMHUB, 0, mmMM_ATC_L2_MISC_CG_Sienna_Cichlid);
+               /* There is no ATCL2 in MMHUB for 2.1.x. Keep the status
+                * based on DAGB
+                */
+               data = MM_ATC_L2_MISC_CG__ENABLE_MASK;
                data1 = RREG32_SOC15(MMHUB, 0, mmDAGB0_CNTL_MISC2_Sienna_Cichlid);
                break;
        default: