FAILED: patch "[PATCH] drm/amdgpu: Remove ATC L2 access for MMHUB 2.1.x" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

20293269d817 ("drm/amdgpu: Remove ATC L2 access for MMHUB 2.1.x")
1d789535a036 ("drm/amdgpu: convert IP version array to include instances")
5c3720be7d46 ("drm/amdgpu: get VCN and SDMA instances from IP discovery table")
2cbc6f4259f6 ("drm/amd/display: fix error case handling")
75a07bcd1d30 ("drm/amdgpu/soc15: convert to IP version checking")
0b64a5a85229 ("drm/amdgpu/vcn2.5: convert to IP version checking")
96b8dd4423e7 ("drm/amdgpu/amdgpu_vcn: convert to IP version checking")
50638f7dbd0b ("drm/amdgpu/pm/amdgpu_smu: convert more IP version checking")
61b396b91196 ("drm/amdgpu/pm/smu_v13.0: convert IP version checking")
6b726a0a52cc ("drm/amdgpu/pm/smu_v11.0: update IP version checking")
1fcc208cd780 ("drm/amdgpu/psp_v13.0: convert to IP version checking")
e47868ea15cb ("drm/amdgpu/psp_v11.0: convert to IP version checking")
82d05736c47b ("drm/amdgpu/amdgpu_psp: convert to IP version checking")
9d0cb2c31891 ("drm/amdgpu/gfx9.0: convert to IP version checking")
24be2d70048b ("drm/amdgpu/hdp4.0: convert to IP version checking")
43bf00f21eaf ("drm/amdgpu/sdma4.0: convert to IP version checking")
559f591dab57 ("drm/amdgpu/display/dm: convert RAVEN to IP version checking")
d4c6e870bdd2 ("drm/amdgpu: add initial IP discovery support for vega based parts")
c08182f2483f ("drm/amdgpu/display/dm: convert to IP version checking")
3e67f4f2e22e ("drm/amdgpu/nv: convert to IP version checking")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 20293269d81779a0d0c0865f5877b240c3335c97 Mon Sep 17 00:00:00 2001
From: Lijo Lazar <lijo.lazar@amd.com>
Date: Fri, 30 Sep 2022 10:43:08 +0530
Subject: [PATCH] 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 4d304f22889e..998b5d17b271 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: