Jiaxun Yang 6f709907ea PCI: loongson: Limit MRRS to 256 ... commit ef61a04057 upstream. This is a partial revert of 8b3517f88f ("PCI: loongson: Prevent LS7A MRRS increases") for MIPS-based Loongson. Some MIPS Loongson systems don't support arbitrary Max_Read_Request_Size (MRRS) settings. 8b3517f88f ("PCI: loongson: Prevent LS7A MRRS increases") worked around that by (1) assuming that firmware configured MRRS to the maximum supported value and (2) preventing the PCI core from increasing MRRS. Unfortunately, some firmware doesn't set that maximum MRRS correctly, which results in devices not being initialized correctly. One symptom, from the Debian report below, is this: ata4.00: exception Emask 0x0 SAct 0x20000000 SErr 0x0 action 0x6 frozen ata4.00: failed command: WRITE FPDMA QUEUED ata4.00: cmd 61/20:e8:00:f0:e1/00:00:00:00:00/40 tag 29 ncq dma 16384 out res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout) ata4.00: status: { DRDY } ata4: hard resetting link Limit MRRS to 256 because MIPS Loongson with higher MRRS support is considered rare. This must be done at device enablement stage because the MRRS setting may get lost if PCI_COMMAND_MASTER on the parent bridge is cleared, and we are only sure parent bridge is enabled at this point. Fixes: 8b3517f88f ("PCI: loongson: Prevent LS7A MRRS increases") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217680 Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035587 Link: https://lore.kernel.org/r/20231201115028.84351-1-jiaxun.yang@flygoat.com Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Huacai Chen <chenhuacai@loongson.cn> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-12-20 15:17:38 +01:00
..
controller	PCI: loongson: Limit MRRS to 256	2023-12-20 15:17:38 +01:00
endpoint	PCI: pci-epf-test: Register notifier if only core_init_notifier is enabled	2022-12-31 13:14:22 +01:00
hotplug	Revert "PCI: acpiphp: Reassign resources on bridge if necessary"	2023-12-20 15:17:38 +01:00
pcie	PCI/ASPM: Fix L1 substate handling in aspm_attr_store_common()	2023-11-28 16:56:28 +00:00
switch	PCI: switchtec: Return -EFAULT for copy_to_user() errors	2023-03-10 09:39:37 +01:00
access.c
ats.c
bus.c	PCI: s390: Fix use-after-free of PCI resources with per-function hotplug	2023-03-22 13:31:24 +01:00
ecam.c
host-bridge.c
iov.c	PCI/IOV: Enlarge virtfn sysfs name buffer	2023-03-10 09:39:37 +01:00
irq.c	PCI: Check for alloc failure in pci_request_irq()	2022-12-31 13:14:24 +01:00
Kconfig
Makefile
mmap.c
msi.c
of.c
p2pdma.c
pci-acpi.c	PCI/sysfs: Protect driver's D3cold preference from user space	2023-11-28 16:56:28 +00:00
pci-bridge-emul.c
pci-bridge-emul.h
pci-driver.c	PCI: Unify delay handling for reset and resume	2023-03-22 13:31:37 +01:00
pci-label.c
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c	PCI/sysfs: Protect driver's D3cold preference from user space	2023-11-28 16:56:28 +00:00
pci.c	PCI: Use FIELD_GET() in Sapphire RX 5600 XT Pulse quirk	2023-11-28 16:56:19 +00:00
pci.h	PCI/ASPM: Remove pcie_aspm_pm_state_change()	2023-05-01 08:23:23 +09:00
probe.c
proc.c
quirks.c	PCI: Disable ATS for specific Intel IPU E2000 devices	2023-11-28 16:56:19 +00:00
remove.c
rom.c
search.c
setup-bus.c	PCI: Take other bus devices into account when distributing resources	2023-03-11 13:57:37 +01:00
setup-irq.c
setup-res.c	PCI: Sanitise firmware BAR assignments behind a PCI-PCI bridge	2022-10-26 12:34:24 +02:00
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c