Signed-off-by: Daniel Axtens <d...@axtens.net>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/kernel/pci-common.c | 2 ++
drivers/gpu/vga/Kconfig | 8 ++++++++
drivers/gpu/vga/vgaarb.c | 21 +++++++++++++++++++++
4 files changed, 32 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 524f71104b75..f86e4c8a9cc6 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -83,6 +83,7 @@ config PPC
select BUILDTIME_EXTABLE_SORT
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
+ select ARCH_WANT_VGA_ARB_FALLBACK
select BINFMT_ELF
select ARCH_HAS_ELF_RANDOMIZE
select OF
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 07f05a0f59a2..e0f29a594aa1 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1740,6 +1740,7 @@ 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);
+#if !defined(CONFIG_ARCH_WANT_VGA_ARB_FALLBACK)
static void fixup_vga(struct pci_dev *pdev)
{
u16 cmd;
@@ -1754,3 +1755,4 @@ static void fixup_vga(struct pci_dev *pdev)
}
DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);
+#endif
diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig
index 29437eabe095..20f6c5a9a159 100644
--- a/drivers/gpu/vga/Kconfig
+++ b/drivers/gpu/vga/Kconfig
@@ -17,6 +17,14 @@ config VGA_ARB_MAX_GPUS
Reserves space in the kernel to maintain resource locking for
multiple GPUS. The overhead for each GPU is very small.
+config ARCH_WANT_VGA_ARB_FALLBACK
+ bool
+ depends on !(X86 || IA64)
+ help
+ Some architectures don't have a concept of "legacy" PCI addresses
+ which the VGA arbiter relies on. Instead, they can fall back to
+ selecting the first device that decodes memory and I/O.
+
config VGA_SWITCHEROO
bool "Laptop Hybrid Graphics - GPU switching support"
depends on X86
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 0f5b2dd24507..02424dc3a58d 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -1472,3 +1472,24 @@ static int __init vga_arb_device_init(void)
return rc;
}
subsys_initcall(vga_arb_device_init);
+
+#if defined(CONFIG_ARCH_WANT_VGA_ARB_FALLBACK)
+static void vga_arb_fallback_fixup(struct pci_dev *pdev)
+{
+ u16 cmd;
+
+ if (vga_default_device())
+ return;
+
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
+ vgaarb_info(&pdev->dev, "[fallback]"
+ " setting as default device\n");
+ vga_set_default_device(pdev);
+ }
+
+}
+DECLARE_PCI_FIXUP_CLASS_ENABLE(PCI_ANY_ID, PCI_ANY_ID,
+ PCI_CLASS_DISPLAY_VGA, 8,
+ vga_arb_fallback_fixup);
+#endif
--
2.11.0
