[PATCHv2 for 6.12 02/10] drm/amd/amdgpu: disable ASPM in some situations

[Rosen Penev]

From: Kenneth Feng <kenneth.feng@xxxxxxx>

[ Upstream commit c770ef19673fb1defcbde2ee2b91c3c89bfcf164 ]

disable ASPM with some ASICs on some specific platforms.
required from PCIe controller owner.

Signed-off-by: Kenneth Feng <kenneth.feng@xxxxxxx>
Reviewed-by: Yang Wang <kevinyang.wang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index dbee43c58741..eb3c6bfe2e6c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -84,6 +84,7 @@
 
 #if IS_ENABLED(CONFIG_X86)
 #include <asm/intel-family.h>
+#include <asm/cpu_device_id.h>
 #endif
 
 MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
@@ -1758,6 +1759,35 @@ static bool amdgpu_device_pcie_dynamic_switching_supported(struct amdgpu_device
 	return true;
 }
 
+static bool amdgpu_device_aspm_support_quirk(struct amdgpu_device *adev)
+{
+#if IS_ENABLED(CONFIG_X86)
+	struct cpuinfo_x86 *c = &cpu_data(0);
+
+	if (!(amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(12, 0, 0) ||
+		  amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(12, 0, 1)))
+		return false;
+
+	if (c->x86 == 6 &&
+		adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN5) {
+		switch (c->x86_model) {
+		case VFM_MODEL(INTEL_ALDERLAKE):
+		case VFM_MODEL(INTEL_ALDERLAKE_L):
+		case VFM_MODEL(INTEL_RAPTORLAKE):
+		case VFM_MODEL(INTEL_RAPTORLAKE_P):
+		case VFM_MODEL(INTEL_RAPTORLAKE_S):
+			return true;
+		default:
+			return false;
+		}
+	} else {
+		return false;
+	}
+#else
+	return false;
+#endif
+}
+
 /**
  * amdgpu_device_should_use_aspm - check if the device should program ASPM
  *
@@ -1782,6 +1812,8 @@ bool amdgpu_device_should_use_aspm(struct amdgpu_device *adev)
 	}
 	if (adev->flags & AMD_IS_APU)
 		return false;
+	if (amdgpu_device_aspm_support_quirk(adev))
+		return false;
 	return pcie_aspm_enabled(adev->pdev);
 }
 
-- 
2.53.0