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nvidiafb: VGA state save and restore

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Allow the saving and restoration of VGA text mode.  The state is saved on the
first open and restored on the last close.  Because of the non-linear mapping
of the VGA registers to the MMIO space, this will be done only on X86
platforms where the device is the primary display.

An echo 0 > /sys/class/vtconsole/vtcon1/bind will convert the display from
graphics to text mode.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonino A. Daplas 2007-05-08 00:38:33 -07:00 committed by Linus Torvalds
parent 19f3d3a554
commit 7dfe50b3aa
3 changed files with 80 additions and 2 deletions
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2
drivers/video/Makefile
View File

@ -32,7 +32,7 @@ obj-$(CONFIG_FB_PM3) += pm3fb.o
obj-$(CONFIG_FB_MATROX) += matrox/
obj-$(CONFIG_FB_RIVA) += riva/ vgastate.o
obj-$(CONFIG_FB_NVIDIA) += nvidia/
obj-$(CONFIG_FB_NVIDIA) += nvidia/ vgastate.o
obj-$(CONFIG_FB_ATY) += aty/ macmodes.o
obj-$(CONFIG_FB_ATY128) += aty/ macmodes.o
obj-$(CONFIG_FB_RADEON) += aty/

6
drivers/video/nvidia/nv_type.h
View File

@ -5,6 +5,8 @@
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/mutex.h>
#include <video/vga.h>
#define NV_ARCH_04 0x04
#define NV_ARCH_10 0x10
@ -93,7 +95,10 @@ struct riva_regs {
struct nvidia_par {
RIVA_HW_STATE SavedReg;
RIVA_HW_STATE ModeReg;
RIVA_HW_STATE initial_state;
RIVA_HW_STATE *CurrentState;
struct vgastate vgastate;
struct mutex open_lock;
u32 pseudo_palette[16];
struct pci_dev *pci_dev;
u32 Architecture;
@ -141,6 +146,7 @@ struct nvidia_par {
int BlendingPossible;
u32 paletteEnabled;
u32 forceCRTC;
u32 open_count;
u8 DDCBase;
#ifdef CONFIG_MTRR
struct {

74
drivers/video/nvidia/nvidia.c
View File

@ -949,8 +949,80 @@ static int nvidiafb_blank(int blank, struct fb_info *info)
return 0;
}
/*
* Because the VGA registers are not mapped linearly in its MMIO space,
* restrict VGA register saving and restore to x86 only, where legacy VGA IO
* access is legal. Consequently, we must also check if the device is the
* primary display.
*/
#ifdef CONFIG_X86
static void save_vga_x86(struct nvidia_par *par)
{
struct resource *res= &par->pci_dev->resource[PCI_ROM_RESOURCE];
if (res && res->flags & IORESOURCE_ROM_SHADOW) {
memset(&par->vgastate, 0, sizeof(par->vgastate));
par->vgastate.flags = VGA_SAVE_MODE | VGA_SAVE_FONTS |
VGA_SAVE_CMAP;
save_vga(&par->vgastate);
}
}
static void restore_vga_x86(struct nvidia_par *par)
{
struct resource *res= &par->pci_dev->resource[PCI_ROM_RESOURCE];
if (res && res->flags & IORESOURCE_ROM_SHADOW)
restore_vga(&par->vgastate);
}
#else
#define save_vga_x86(x) do {} while (0)
#define restore_vga_x86(x) do {} while (0)
#endif /* X86 */
static int nvidiafb_open(struct fb_info *info, int user)
{
struct nvidia_par *par = info->par;
mutex_lock(&par->open_lock);
if (!par->open_count) {
save_vga_x86(par);
nvidia_save_vga(par, &par->initial_state);
}
par->open_count++;
mutex_unlock(&par->open_lock);
return 0;
}
static int nvidiafb_release(struct fb_info *info, int user)
{
struct nvidia_par *par = info->par;
int err = 0;
mutex_lock(&par->open_lock);
if (!par->open_count) {
err = -EINVAL;
goto done;
}
if (par->open_count == 1) {
nvidia_write_regs(par, &par->initial_state);
restore_vga_x86(par);
}
par->open_count--;
done:
mutex_unlock(&par->open_lock);
return 0;
}
static struct fb_ops nvidia_fb_ops = {
.owner = THIS_MODULE,
.fb_open = nvidiafb_open,
.fb_release = nvidiafb_release,
.fb_check_var = nvidiafb_check_var,
.fb_set_par = nvidiafb_set_par,
.fb_setcolreg = nvidiafb_setcolreg,
@ -1208,7 +1280,7 @@ static int __devinit nvidiafb_probe(struct pci_dev *pd,
par = info->par;
par->pci_dev = pd;
mutex_init(&par->open_lock);
info->pixmap.addr = kzalloc(8 * 1024, GFP_KERNEL);
if (info->pixmap.addr == NULL)