[FS#3279] mac80211 doesn't see AR9820 minipci adapter at mt7621 board

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Aleksey Tregubov (AelxG) 

Attached to Project - OpenWrt/LEDE Project
Summary - mac80211 doesn't see AR9820 minipci adapter at mt7621 board
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: Unielec 7621-06 mt7621 with 64M Flash with Atheros AR9820 mini pcie adapter
Software: trunk

After sysupgrade -n with trunk image kernel does not recognize Atheros adapter:

  root at router:~# lspci -k
  00:00.0 PCI bridge: Device 0e8d:0801 (rev 01)
  00:01.0 PCI bridge: Device 0e8d:0801 (rev 01)
  01:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02)
          Subsystem: ASMedia Technology Inc. Device 1060
          Kernel driver in use: ahci
  02:00.0 Ethernet controller: Qualcomm Atheros AR5008 Wireless Network Adapter (rev 01)

There is no interesting at dmesg output exсepts this:

  [    1.028161]	mt7621-pci 1e140000.pcie: Parsing DT failed
  [    1.140760]	mt7621-pci 1e140000.pcie: Error applying setting, reverse things back

Also there is no any messages about enabling pci002:00.0 device.


If mac80211 removed (with depended packets) adapter initialized correctly:

  root at router:~# lspci -k
  00:00.0 PCI bridge: Device 0e8d:0801 (rev 01)
  00:01.0 PCI bridge: Device 0e8d:0801 (rev 01)
  01:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02)
          Subsystem: ASMedia Technology Inc. Device 1060
          Kernel driver in use: ahci
  02:00.0 Ethernet controller: Qualcomm Atheros AR982X Wireless Network Adapter (rev 01)

Image built by myself, downloaded snapshot from openwrt.org does not run at all.

The same card at the same device works perfectly with 19.07.3:

  root at router:~# lspci -k
  00:00.0 PCI bridge: Device 0e8d:0801 (rev 01)
  00:01.0 PCI bridge: Device 0e8d:0801 (rev 01)
  01:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02)
          Subsystem: ASMedia Technology Inc. Device 1060
          Kernel driver in use: ahci
  02:00.0 Network controller: Qualcomm Atheros AR928X Wireless Network Adapter (PCI-Express) (rev 01)
          Subsystem: Qualcomm Atheros Device 3099
          Kernel driver in use: ath9k


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3279

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