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lx_kit/x86: clamp PCI interrupt PIN to 1

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If any PCI device reports 0 as interrupt PIN, drivers may try to force
MSI setup (e.g., xhci). So, we clamp the interrupt PIN to 1 to let
drivers finish initialization and don't bother the platform driver.
This commit is contained in:
Christian Helmuth 2022-03-24 16:14:44 +01:00
parent afe02efb8f
commit 1b4cd93dc2
1 changed files with 8 additions and 0 deletions
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8
repos/dde_linux/src/lib/lx_kit/spec/x86/platform.cc
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@ -339,6 +339,14 @@ unsigned Platform::Device::Config_space::read(unsigned char address,
return bar_address(_device, *_device._platform._devices_node, bar);
}
/*
* If any PCI device reports 0 as interrupt PIN, drivers may try to force
* MSI setup (e.g., xhci). So, we clamp the interrupt PIN to 1 to let
* drivers finish initialization and don't bother the platform driver.
*/
if (address == 0x3d)
return 0x01;
if (address == 0x3c)
return irq_line(_device, *_device._platform._devices_node);