[PATCH] PCI: Disable not supported reset methods on DG1 0x4905

[Janusz Krzysztofik]

DRM CI consequently reports failing device reset attempts on Intel DG1
discrete graphics adapters.  Manual reproduction attempts allowed to
narrow down the scope of that problem to a specific revision of that
hardware, SKU 8086:4905.  It has been confirmed that both reset methods
claimed by the device, i.e., flr and bus, suffer from that issue.

Since consecutively failing device resets may lead to system hangs,
disable both useless reset methods.  A respective CI test will then be
skipped instead of aborting whole CI jobs.

Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/11814
Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>
---
 drivers/pci/quirks.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index b09f27f7846fc..63298fba9ddeb 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3808,6 +3808,9 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TI, 0xb005, quirk_no_bus_reset);
  */
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ASMEDIA, 0x1164, quirk_no_bus_reset);
 
+/* Intel DG1 0x4905 may not recover from bus reset */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x4905, quirk_no_bus_reset);
+
 static void quirk_no_pm_reset(struct pci_dev *dev)
 {
 	/*
@@ -5594,6 +5597,7 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443, quirk_intel_qat_vf_cap);
  * AMD Neural Processing Unit 0x1502 0x17f0
  * Intel 82579LM Gigabit Ethernet Controller 0x1502
  * Intel 82579V Gigabit Ethernet Controller 0x1503
+ * Intel DG1 Discrete Graphics Adapter 0x4905
  * Mediatek MT7922 802.11ax PCI Express Wireless Network Adapter
  * Mediatek MT7925 802.11be PCI Express Wireless Network Adapter
  */
@@ -5609,6 +5613,7 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1502, quirk_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x17f0, quirk_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_no_flr);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x4905, quirk_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MEDIATEK, 0x0616, quirk_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MEDIATEK, 0x7925, quirk_no_flr);
 
-- 
2.54.0