From a2da5d8cc0b0ba637bdca8887f5ecc72f18c7e81 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 10 Dec 2020 10:08:47 -0600
Subject: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken in some platforms
Edgar reported [1] AMD Raven iGPU errors on several of his systems. There
is no root cause. Turn off ATS on these systems to avoid the issue.
[1] https://lore.kernel.org/linux-iommu/MWHPR10MB1310CDB6829DDCF5EA84A14689150@MWHPR10MB1310.namprd10.prod.outlook.com/
[bhelgaas: commit log]
Link: https://lore.kernel.org/r/MWHPR10MB131082779A86BE4CCCF190B789CB0@MWHPR10MB1310.namprd10.prod.outlook.com
Reported-by: Edgar Merger <Edgar.Merger@emerson.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/quirks.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f70692ac79c5..02d0c1fa2f09 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5164,6 +5164,18 @@ static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
(pdev->device == 0x7340 && pdev->revision != 0xc5))
return;
+ if (pdev->device == 0x15d8) {
+ if (pdev->revision == 0xcf &&
+ pdev->subsystem_vendor == 0xea50 &&
+ (pdev->subsystem_device == 0xce19 ||
+ pdev->subsystem_device == 0xcc10 ||
+ pdev->subsystem_device == 0xcc08))
+ goto no_ats;
+ else
+ return;
+ }
+
+no_ats:
pci_info(pdev, "disabling ATS\n");
pdev->ats_cap = 0;
}
@@ -5176,6 +5188,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_amd_harvest_no_ats);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7312, quirk_amd_harvest_no_ats);
/* AMD Navi14 dGPU */
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7340, quirk_amd_harvest_no_ats);
+/* AMD Raven platform iGPU */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x15d8, quirk_amd_harvest_no_ats);
#endif /* CONFIG_PCI_ATS */
/* Freescale PCIe doesn't support MSI in RC mode */
--
2.50.1