Commit 20cde694 authored by Bruno Prémont's avatar Bruno Prémont Committed by Bjorn Helgaas
Browse files

x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() 



Commit b4aa0163 ("efifb: Implement vga_default_device() (v2)") added
efifb vga_default_device() so EFI systems that do not load shadow VBIOS or
setup VGA get proper value for boot_vga PCI sysfs attribute on the
corresponding PCI device.

Xorg doesn't detect devices when boot_vga=0, e.g., on some EFI systems such
as MacBookAir2,1.  Xorg detects the GPU and finds the DRI device but then
bails out with "no devices detected".

Note: When vga_default_device() is set boot_vga PCI sysfs attribute
reflects its state.  When unset this attribute is 1 whenever
IORESOURCE_ROM_SHADOW flag is set.

With introduction of sysfb/simplefb/simpledrm efifb is getting obsolete
while having native drivers for the GPU also makes selecting sysfb/efifb
optional.

Remove the efifb implementation of vga_default_device() and initialize
vgaarb's vga_default_device() with the PCI GPU that matches boot
screen_info in pci_fixup_video().

[bhelgaas: remove unused "dev" in efifb_setup()]
Fixes: b4aa0163 ("efifb: Implement vga_default_device() (v2)")
Tested-by: default avatarAnibal Francisco Martinez Cortina <linuxkid.zeuz@gmail.com>
Signed-off-by: default avatarBruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
CC: stable@vger.kernel.org	# v3.5+
parent dcfa9be8

arch/ia64/pci/fixup.c

+22 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
#include <linux/pci.h>

#include <linux/init.h>

#include <linux/vgaarb.h>

#include <linux/screen_info.h>



#include <asm/machvec.h>
@@ -37,6 +38,27 @@ static void pci_fixup_video(struct pci_dev *pdev) 
		return;

	/* Maybe, this machine supports legacy memory map. */



	if (!vga_default_device()) {

		resource_size_t start, end;

		int i;



		/* Does firmware framebuffer belong to us? */

		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {

			if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))

				continue;



			start = pci_resource_start(pdev, i);

			end  = pci_resource_end(pdev, i);



			if (!start || !end)

				continue;



			if (screen_info.lfb_base >= start &&

			    (screen_info.lfb_base + screen_info.lfb_size) < end)

				vga_set_default_device(pdev);

		}

	}



	/* Is VGA routed to us? */

	bus = pdev->bus;

	while (bus) {

arch/x86/include/asm/vga.h

+0 −6
Original line number Diff line number Diff line
@@ -17,10 +17,4 @@ 
#define vga_readb(x) (*(x))

#define vga_writeb(x, y) (*(y) = (x))



#ifdef CONFIG_FB_EFI

#define __ARCH_HAS_VGA_DEFAULT_DEVICE

extern struct pci_dev *vga_default_device(void);

extern void vga_set_default_device(struct pci_dev *pdev);

#endif



#endif /* _ASM_X86_VGA_H */

arch/x86/pci/fixup.c

+21 −0
Original line number Diff line number Diff line
@@ -326,6 +326,27 @@ static void pci_fixup_video(struct pci_dev *pdev) 
	struct pci_bus *bus;

	u16 config;



	if (!vga_default_device()) {

		resource_size_t start, end;

		int i;



		/* Does firmware framebuffer belong to us? */

		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {

			if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))

				continue;



			start = pci_resource_start(pdev, i);

			end  = pci_resource_end(pdev, i);



			if (!start || !end)

				continue;



			if (screen_info.lfb_base >= start &&

			    (screen_info.lfb_base + screen_info.lfb_size) < end)

				vga_set_default_device(pdev);

		}

	}



	/* Is VGA routed to us? */

	bus = pdev->bus;

	while (bus) {

drivers/video/fbdev/efifb.c

+0 −39
Original line number Diff line number Diff line
@@ -19,8 +19,6 @@ 


static bool request_mem_succeeded = false;



static struct pci_dev *default_vga;



static struct fb_var_screeninfo efifb_defined = {

	.activate		= FB_ACTIVATE_NOW,

	.height			= -1,
@@ -84,23 +82,10 @@ static struct fb_ops efifb_ops = { 
	.fb_imageblit	= cfb_imageblit,

};



struct pci_dev *vga_default_device(void)

{

	return default_vga;

}



EXPORT_SYMBOL_GPL(vga_default_device);



void vga_set_default_device(struct pci_dev *pdev)

{

	default_vga = pdev;

}



static int efifb_setup(char *options)

{

	char *this_opt;

	int i;

	struct pci_dev *dev = NULL;



	if (options && *options) {

		while ((this_opt = strsep(&options, ",")) != NULL) {
@@ -126,30 +111,6 @@ static int efifb_setup(char *options) 
		}

	}



	for_each_pci_dev(dev) {

		int i;



		if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)

			continue;



		for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {

			resource_size_t start, end;



			if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))

				continue;



			start = pci_resource_start(dev, i);

			end  = pci_resource_end(dev, i);



			if (!start || !end)

				continue;



			if (screen_info.lfb_base >= start &&

			    (screen_info.lfb_base + screen_info.lfb_size) < end)

				default_vga = dev;

		}

	}



	return 0;

}

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