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

[Lijo Lazar <lijo.lazar@xxxxxxx>]

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.

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

Signed-off-by: Lijo Lazar <lijo.lazar@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c | 28 +++++++------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v2_0.c
index 4d304f22889e..5ec6d17fed09 100644
--- 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:
-- 
2.25.1