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Tomasz Maciej Nowak 772258044b mvebu: reduce speed to gen1 for espressobin pcie
Since the beginning there's been an issue with initializing the Atheros
based MiniPCIe wireless cards. Here's an example of kerenel log:

 OF: PCI: host bridge /soc/pcie@d0070000 ranges:
 OF: PCI:   MEM 0xe8000000..0xe8ffffff -> 0xe8000000
 OF: PCI:    IO 0xe9000000..0xe900ffff -> 0xe9000000
 advk-pcie d0070000.pcie: link up
 advk-pcie d0070000.pcie: PCI host bridge to bus 0000:00
 pci_bus 0000:00: root bus resource [bus 00-ff]
 pci_bus 0000:00: root bus resource [mem0xe8000000-0xe8ffffff]
 pci_bus 0000:00: root bus resource [io  0x0000-0xffff](bus address[0xe9000000-0xe900ffff])
 pci 0000:00:00.0: BAR 0: assigned [mem0xe8000000-0xe801ffff 64bit]
 pci 0000:00:00.0: BAR 6: assigned [mem0xe8020000-0xe802ffff pref]
 [...]
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x3c
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x44
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
 ath9k 0000:00:00.0: enabling device (0000 -> 0002)
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x3c
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0xc
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x40
 ath9k 0000:00:00.0: request_irq failed
 advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
 ath9k: probe of 0000:00:00.0 failed with error -22

The same happens for ath5k cards, while ath10k card didn't appear at
all (not detected):

 OF: PCI: host bridge /soc/pcie@d0070000 ranges:
 OF: PCI:   MEM 0xe8000000..0xe8ffffff -> 0xe8000000
 OF: PCI:    IO 0xe9000000..0xe900ffff -> 0xe9000000
 advk-pcie d0070000.pcie: link never came up
 advk-pcie d0070000.pcie: PCI host bridge to bus 0000:00
 pci_bus 0000:00: root bus resource [bus 00-ff]
 pci_bus 0000:00: root bus resource [mem0xe8000000-0xe8ffffff]
 pci_bus 0000:00: root bus resource [io  0x0000-0xffff](bus address[0xe9000000-0xe900ffff])
 advk-pcie d0070000.pcie: config read/write timed out

Following the issue on esppressobin.net forum [1] the workaround seems
to be limiting the speed of PCIe bridge to 1st generation. This fixed
the initialisation of all tested Atheros wireless cards.

The change shouldn't affect the performance for wireless cards,
it could reduce the performance of storage controller cards but since
OpenWrt focuses on wireless connectivity, fixing compatibility with
wireless cards should be a priority.

For the record, the iwlwifi and mt76 cards were not affected by this
issue.

1. http://espressobin.net/forums/topic/which-pcie-wlan-cards-are-supported

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>
2018-06-18 07:10:20 +02:00
.github merge: github: use OpenWrt in issue/pr templates 2018-01-03 20:36:57 +01:00
config config: fix ARM64 dependency check 2018-02-10 20:16:39 +01:00
include kernel: bump 4.14 to 4.14.49 2018-06-18 07:10:19 +02:00
package uboot-sunxi: update Orange Pi R1 and Zero Plus 2018-06-18 07:10:20 +02:00
scripts scripts: Replace obsolete POSIX tmpnam in slugimage.pl with File::Temp function 2018-06-05 10:07:42 -04:00
target mvebu: reduce speed to gen1 for espressobin pcie 2018-06-18 07:10:20 +02:00
toolchain toolchain/glibc: update to latest 2.26 commit 2018-06-11 18:07:47 +02:00
tools tools: build squashfs (v3) for ath79 2018-06-16 10:08:51 +02:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore .gitignore: add .project & .cproject for eclipse users 2018-01-17 11:07:17 +01:00
BSDmakefile add missing copyright header 2007-02-26 01:05:09 +00:00
Config.in merge: base: update base-files and basic config 2017-12-08 19:41:18 +01:00
feeds.conf.default feeds: switch git.lede-project.org URLs to git.openwrt.org 2018-01-16 16:59:22 +01:00
LICENSE finally move buildroot-ng to trunk 2016-03-20 17:29:15 +01:00
Makefile merge: base: update base-files and basic config 2017-12-08 19:41:18 +01:00
README merge: base: update base-files and basic config 2017-12-08 19:41:18 +01:00
rules.mk imagebuilder: reuse rootfs preparation from rootfs.mk 2018-03-07 09:59:08 +01:00

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