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74 lines
3.2 KiB
Diff
74 lines
3.2 KiB
Diff
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From 33f8fdcedb01680427328d710594facef7a0092c Mon Sep 17 00:00:00 2001
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From: Tomasz Maciej Nowak <tmn505@gmail.com>
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Date: Thu, 14 Jun 2018 14:40:26 +0200
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Subject: [PATCH 2/2] arm64: dts: armada-3720-espressobin: set max link to gen1
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Since the beginning there's been an issue with initializing the Atheros
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based MiniPCIe wireless cards. Here's an example of kerenel log:
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OF: PCI: host bridge /soc/pcie@d0070000 ranges:
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OF: PCI: MEM 0xe8000000..0xe8ffffff -> 0xe8000000
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OF: PCI: IO 0xe9000000..0xe900ffff -> 0xe9000000
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advk-pcie d0070000.pcie: link up
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advk-pcie d0070000.pcie: PCI host bridge to bus 0000:00
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pci_bus 0000:00: root bus resource [bus 00-ff]
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pci_bus 0000:00: root bus resource [mem0xe8000000-0xe8ffffff]
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pci_bus 0000:00: root bus resource [io 0x0000-0xffff](bus address [0xe9000000-0xe900ffff])
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pci 0000:00:00.0: BAR 0: assigned [mem0xe8000000-0xe801ffff 64bit]
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pci 0000:00:00.0: BAR 6: assigned [mem0xe8020000-0xe802ffff pref]
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[...]
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x3c
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x44
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
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ath9k 0000:00:00.0: enabling device (0000 -> 0002)
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x3c
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0xc
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x40
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ath9k 0000:00:00.0: request_irq failed
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advk-pcie d0070000.pcie: Posted PIO Response Status: CA,0xe00 @ 0x4
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ath9k: probe of 0000:00:00.0 failed with error -22
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The same happens for ath5k cards, while ath10k card didn't appear at
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all (not detected):
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OF: PCI: host bridge /soc/pcie@d0070000 ranges:
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OF: PCI: MEM 0xe8000000..0xe8ffffff -> 0xe8000000
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OF: PCI: IO 0xe9000000..0xe900ffff -> 0xe9000000
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advk-pcie d0070000.pcie: link never came up
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advk-pcie d0070000.pcie: PCI host bridge to bus 0000:00
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pci_bus 0000:00: root bus resource [bus 00-ff]
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pci_bus 0000:00: root bus resource [mem0xe8000000-0xe8ffffff]
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pci_bus 0000:00: root bus resource [io 0x0000-0xffff](bus address [0xe9000000-0xe900ffff])
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advk-pcie d0070000.pcie: config read/write timed out
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Following the issue on esppressobin.net forum [1] the workaround seems
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to be limiting the speed of PCIe bridge to 1st generation. This fixed
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the initialisation of all tested Atheros wireless cards.
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The patch in the forum thread swaped registers which would limit speed
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for all Armada 3700 based boards. The approach in this patch, in
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conjunction with "PCI: aardvark: allow to specify link capability" patch
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is less invasive, it only touches the affected board.
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For the record, the iwlwifi and mt76 cards were not affected by this
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issue.
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1. http://espressobin.net/forums/topic/which-pcie-wlan-cards-are-supported
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Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
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---
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arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts | 2 ++
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1 file changed, 2 insertions(+)
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--- a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
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+++ b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
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@@ -46,6 +46,8 @@
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/* J9 */
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&pcie0 {
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status = "okay";
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+
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+ max-link-speed = <1>;
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};
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/* J6 */
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