Re: [PATCH v3 0/3] Split default display handling out from VGA arbiter
From: Daniel Axtens <hidden>
Date: 2017-09-25 23:35:40
Also in:
linux-arm-kernel, linux-pci, linuxppc-dev
Hi Bjorn,
But I think trying to split the "default device" part out from the VGA arbiter ends up being overkill and making things more complicated instead of simpler.
Fair enough.
Would something like the following work for you as well as the powerpc case? On powerpc, we already use vga_set_default_device() to select a device that doesn't use legacy VGA resources, so maybe we can just do the same on ARM64?
It looks good. I'll try to get some time on the test system to test it and I'll pester my friends at IBM to give it a go as well.
I suppose there might be wrinkles in how the arbiter deals with multiple graphics devices on those systems, since I don't think it identifies these devices that don't use the legacy resources, but it seems like we live with whatever those on are powerpc and probably can on ARM64 as well.
I would say so, yes. Thanks for sticking with this! Regards, Daniel
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 02831a396419..0ac7aa346c69 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c@@ -1740,15 +1740,3 @@ static void fixup_hide_host_resource_fsl(struct pci_dev *dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); - -static void fixup_vga(struct pci_dev *pdev) -{ - u16 cmd; - - pci_read_config_word(pdev, PCI_COMMAND, &cmd); - if ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device()) - vga_set_default_device(pdev); - -} -DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, - PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c index 76875f6299b8..9df4802c5f04 100644 --- a/drivers/gpu/vga/vgaarb.c +++ b/drivers/gpu/vga/vgaarb.c@@ -1468,6 +1468,21 @@ static int __init vga_arb_device_init(void) vgaarb_info(dev, "no bridge control possible\n"); } + if (!vga_default_device()) { + list_for_each_entry(vgadev, &vga_list, list) { + struct device *dev = &vgadev->pdev->dev; + u16 cmd; + + pdev = vgadev->pdev; + pci_read_config_word(pdev, PCI_COMMAND, &cmd); + if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { + vgaarb_info(dev, "setting as boot device\n"); + vga_set_default_device(pdev); + break; + } + } + } + pr_info("loaded\n"); return rc; }
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