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

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Commit b4aa016305 ("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: b4aa016305 ("efifb: Implement vga_default_device() (v2)")
Tested-by: Anibal Francisco Martinez Cortina <linuxkid.zeuz@gmail.com>
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Matthew Garrett <matthew.garrett@nebula.com>
CC: stable@vger.kernel.org	# v3.5+
This commit is contained in:
Bruno Prémont 2014-06-25 00:55:01 +02:00 committed by Bjorn Helgaas
parent dcfa9be838
commit 20cde69402
4 changed files with 43 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/ia64/pci/fixup.c
View File

@ -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) {

6
arch/x86/include/asm/vga.h
View File

@ -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 */

21
arch/x86/pci/fixup.c
View File

@ -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) {

39
drivers/video/fbdev/efifb.c
View File

@ -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;
}