* help: vga behind pci bridge, bridge not forwarding
@ 2017-02-28 9:15 abbrous
0 siblings, 0 replies; only message in thread
From: abbrous @ 2017-02-28 9:15 UTC (permalink / raw)
To: linux-arm-kernel
hello,
I want to ask a question, anybody can help me?
I have a armv8 compatible machine, and my only vga device is behind a bridge, I found this bridge can not route address: vgaarb: decodes=io+mem,owns = none (in dmesg log). And I don't have PCI_PROBE_ONLY in device tree. AND I noticed in file vgaarb.c there just have one BRIDGE FORWARDING check in a while loop. Before this check, bridge forwarding bit (write PCI_BRIDGE_CTL_VGA to BRIDGE_CONTROL register?)havn't set in bus enumetation routine.
My question is how and where to add some code to repair this problem? Kernel version: 4.9.9.
Thanks in advance.
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2017-02-28 9:15 help: vga behind pci bridge, bridge not forwarding abbrous
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