diff options
Diffstat (limited to 'target/linux/mvebu/patches-4.19/528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch')
| -rw-r--r-- | target/linux/mvebu/patches-4.19/528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/target/linux/mvebu/patches-4.19/528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch b/target/linux/mvebu/patches-4.19/528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch new file mode 100644 index 0000000000..88080d64ca --- /dev/null +++ b/target/linux/mvebu/patches-4.19/528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch @@ -0,0 +1,73 @@ +From 33f8fdcedb01680427328d710594facef7a0092c Mon Sep 17 00:00:00 2001 +From: Tomasz Maciej Nowak <tmn505@gmail.com> +Date: Thu, 14 Jun 2018 14:40:26 +0200 +Subject: [PATCH 2/2] arm64: dts: armada-3720-espressobin: set max link to gen1 + +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 patch in the forum thread swaped registers which would limit speed +for all Armada 3700 based boards. The approach in this patch, in +conjunction with "PCI: aardvark: allow to specify link capability" patch +is less invasive, it only touches the affected board. + +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 <tmn505@gmail.com> +--- + arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts ++++ b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts +@@ -46,6 +46,8 @@ + /* J9 */ + &pcie0 { + status = "okay"; ++ ++ max-link-speed = <1>; + }; + + /* J6 */ |