[PATCH 2/2] pci: add ATS quirk for navi14 board (v2)

[Alex Deucher]

On some harvest configurations, a driver needs to properly initialize
some of the caches on the GPU for instances that are harvested
(parts of the chip that are disabled due to silicon flaws).  For navi
we implemented this in the vbios, but it appears some boards went
to production with an older vbios.  Add a quirk for this board.

The necessary code to fix this up is too complex to add
as a quirk.

v2: use revision id.  Only revision 0xc5 should be affected.

Bug: https://gitlab.freedesktop.org/drm/amd/issues/1015
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6569dacbb48b..f7a5e1c3c523 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5087,6 +5087,12 @@ static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
 		pci_info(pdev, "disabling ATS\n");
 		pdev->ats_cap = 0;
 		break;
+	case 0x7340:
+		if (pdev->revision == 0xc5) {
+			pci_info(pdev, "disabling ATS\n");
+			pdev->ats_cap = 0;
+		}
+		break;
 	default:
 		break;
 	}
@@ -5096,6 +5102,8 @@ static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_amd_harvest_no_ats);
 /* AMD Iceland dGPU */
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_amd_harvest_no_ats);
+/* AMD Navi14 dGPU */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7340, quirk_amd_harvest_no_ats);
 #endif /* CONFIG_PCI_ATS */
 
 /* Freescale PCIe doesn't support MSI in RC mode */
-- 
2.24.1