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Pali Rohár 771153fc88 PCI: aardvark: Fix support for bus mastering and PCI_COMMAND on emulated bridge 
From very vague, ambiguous and incomplete information from Marvell we
deduced that the 32-bit Aardvark register at address 0x4
(PCIE_CORE_CMD_STATUS_REG), which is not documented for Root Complex mode
in the Functional Specification (only for Endpoint mode), controls two
16-bit PCIe registers: Command Register and Status Registers of PCIe Root
Port.

This means that bit 2 controls bus mastering and forwarding of memory and
I/O requests in the upstream direction. According to PCI specifications
bits [0:2] of Command Register, this should be by default disabled on
reset. So explicitly disable these bits at early setup of the Aardvark
driver.

Remove code which unconditionally enables all 3 bits and let kernel code
(via pci_set_master() function) to handle bus mastering of Root PCIe
Bridge via emulated PCI_COMMAND on emulated bridge.

Link: https://lore.kernel.org/r/20211028185659.20329-5-kabel@kernel.org
Fixes: 8a3ebd8de3 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org # b2a56469d5 ("PCI: aardvark: Add FIXME comment for PCIE_CORE_CMD_STATUS_REG access")
2021-10-29 10:25:31 +01:00
..
accessibility
acpi Additional ACPI updates for 5.15-rc1 2021-09-10 13:29:04 -07:00
amba
android
ata libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD. 2021-09-03 08:06:02 -06:00
atm
auxdisplay
base xen: branch for v5.15-rc2 2021-09-17 08:31:49 -07:00
bcma
block virtio,vdpa,vhost: features, fixes 2021-09-11 14:48:42 -07:00
bluetooth
bus ARM: SoC drivers for 5.15 2021-09-01 15:25:28 -07:00
cdrom
char IPMI: A couple of very minor fixes for style and rate limiting 2021-09-12 11:44:58 -07:00
clk One patch to fix an unused variable warning in a Qualcomm clk driver. 2021-09-11 10:05:56 -07:00
clocksource - converted Pistachio platform to use MIPS generic kernel 2021-09-03 11:11:54 -07:00
comedi
connector
counter
cpufreq Power management fixes for 5.15-rc2 2021-09-17 12:05:04 -07:00
cpuidle - Core Frameworks 2021-09-07 12:38:59 -07:00
crypto pci-v5.15-changes 2021-09-07 19:13:42 -07:00
cxl cxl for v5.15 2021-09-09 11:48:27 -07:00
dax libnvdimm for v5.15 2021-09-09 11:39:57 -07:00
dca
devfreq devfreq: use HZ macros 2021-09-08 11:50:26 -07:00
dio
dma dmaengine updates for v5.15-rc1 2021-09-09 11:07:47 -07:00
dma-buf dma-buf: DMABUF_SYSFS_STATS should depend on DMA_SHARED_BUFFER 2021-09-07 12:42:21 +05:30
edac
eisa
extcon
firewire FireWire (IEEE 1394) subsystem updates: 2021-09-11 09:47:33 -07:00
firmware - Add the tegra3 thermal sensor and fix the compilation testing on 2021-09-11 09:20:57 -07:00
fpga
fsi
gnss
gpio gpio updates for v5.15 2021-09-07 12:27:27 -07:00
gpu Revert "drm/vc4: hdmi: Remove drm_encoder->crtc usage" 2021-09-19 10:11:53 -07:00
greybus
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-09-02 14:30:46 -07:00
hsi
hv hyperv-fixes for 5.15-rc2 2021-09-15 17:18:56 -07:00
hwmon Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
hwspinlock
hwtracing
i2c platform-drivers-x86 for v5.15-1 2021-09-02 13:49:39 -07:00
i3c
idle
iio Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
infiniband RDMA v5.15 merge window 2nd Pull Request 2021-09-09 11:14:14 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-09-11 09:08:28 -07:00
interconnect
iommu virtio,vdpa,vhost: features, fixes 2021-09-11 14:48:42 -07:00
ipack
irqchip
isdn Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
leds
macintosh memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
mailbox
mcb
md libnvdimm for v5.15 2021-09-09 11:39:57 -07:00
media Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
memory
memstick
message
mfd - Core Frameworks 2021-09-07 12:38:59 -07:00
misc Misc driver fix for 5.15-rc1 2021-09-12 11:56:00 -07:00
mmc Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
most
mtd Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
mux
net dmascc: use proper 'virt_to_bus()' rather than casting to 'int' 2021-09-19 10:49:42 -07:00
nfc
ntb Bug fixes and clean-ups for Linux v5.15 2021-09-07 13:05:02 -07:00
nubus
nvdimm cxl for v5.15 2021-09-09 11:48:27 -07:00
nvme nvme fixes for Linux 5.15 2021-09-15 07:53:32 -06:00
nvmem
of of: restricted dma: Fix condition for rmem init 2021-09-17 15:58:09 -05:00
opp
parisc parisc: Move pci_dev_is_behind_card_dino to where it is used 2021-09-09 12:44:31 +02:00
parport parisc architecture updates for kernel 5.15: 2021-09-02 13:16:00 -07:00
pci PCI: aardvark: Fix support for bus mastering and PCI_COMMAND on emulated bridge 2021-10-29 10:25:31 +01:00
pcmcia
perf
phy Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
pinctrl Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
platform chrome platform changes for 5.15 2021-09-08 16:43:46 -07:00
pnp
power
powercap
pps
ps3
ptp
pwm pwm: mtk-disp: Implement atomic API .get_state() 2021-09-02 22:27:46 +02:00
rapidio
ras
regulator
remoteproc
reset ARM: SoC drivers for 5.15 2021-09-01 15:25:28 -07:00
rpmsg
rtc rtc: cmos: Disable irq around direct invocation of cmos_interrupt() 2021-09-14 10:20:19 +02:00
s390 s390/ap: fix kernel doc comments 2021-09-15 14:29:21 +02:00
sbus
scsi pci-v5.15-changes 2021-09-07 19:13:42 -07:00
sh
siox
slimbus
soc ARM: SoC drivers for 5.15 2021-09-01 15:25:28 -07:00
soundwire
spi spi: Fix tegra20 build with CONFIG_PM=n 2021-09-18 10:05:06 -07:00
spmi
ssb
staging Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
target SCSI misc on 20210902 2021-09-02 15:09:46 -07:00
tc
tee
thermal - Add the tegra3 thermal sensor and fix the compilation testing on 2021-09-11 09:20:57 -07:00
thunderbolt thunderbolt: test: split up test cases in tb_test_credit_alloc_all 2021-09-06 12:27:03 -07:00
tty parisc architecture updates for kernel 5.15: 2021-09-02 13:16:00 -07:00
uio
usb More USB changes for 5.15-rc1 2021-09-05 11:19:15 -07:00
vdpa virtio,vdpa,vhost: features, fixes 2021-09-11 14:48:42 -07:00
vfio VFIO update for v5.15-rc1 2021-09-02 13:41:33 -07:00
vhost Networking fixes for 5.15-rc2, including fixes from bpf. 2021-09-16 13:05:42 -07:00
video tgafb: clarify dependencies 2021-09-18 11:15:01 -07:00
virt
virtio virtio,vdpa,vhost: features, fixes 2021-09-11 14:48:42 -07:00
visorbus
vlynq
vme
w1
watchdog
xen xen: branch for v5.15-rc2 2021-09-17 08:31:49 -07:00
zorro
Kconfig
Makefile