Commit 22d832ed authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
Browse files

savagefb: VGA state save and restore 



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 VGA registers are
linearly mapped to the MMIO space, MMIO access is used which is not limited to
X86 platforms nor to the primary display device.

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

Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f7829158

drivers/video/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ obj-$(CONFIG_FB_ATY128) += aty/ macmodes.o 
obj-$(CONFIG_FB_RADEON)		  += aty/

obj-$(CONFIG_FB_SIS)		  += sis/

obj-$(CONFIG_FB_KYRO)             += kyro/

obj-$(CONFIG_FB_SAVAGE)		  += savage/

obj-$(CONFIG_FB_SAVAGE)		  += savage/ vgastate.o

obj-$(CONFIG_FB_GEODE)		  += geode/

obj-$(CONFIG_FB_MBX)		  += mbx/

obj-$(CONFIG_FB_I810)             += vgastate.o

drivers/video/savage/savagefb.h

+8 −2
Original line number Diff line number Diff line
@@ -15,6 +15,8 @@ 
#include <linux/i2c.h>

#include <linux/i2c-id.h>

#include <linux/i2c-algo-bit.h>

#include <linux/mutex.h>

#include <video/vga.h>

#include "../edid.h"



#ifdef SAVAGEFB_DEBUG
@@ -189,8 +191,12 @@ struct savagefb_par { 
	struct savagefb_i2c_chan chan;

	struct savage_reg state;

	struct savage_reg save;

	struct savage_reg initial;

	struct vgastate vgastate;

	struct mutex open_lock;

	unsigned char   *edid;

	u32 pseudo_palette[16];

	u32 open_count;

	int paletteEnabled;

	int pm_state;

	int display_type;
@@ -203,7 +209,7 @@ struct savagefb_par { 
	int clock[4];

	int MCLK, REFCLK, LCDclk;

	struct {

		u8   __iomem *vbase;

		void   __iomem *vbase;

		u32    pbase;

		u32    len;

#ifdef CONFIG_MTRR
@@ -212,7 +218,7 @@ struct savagefb_par { 
	} video;



	struct {

		volatile u8  __iomem *vbase;

		void  __iomem *vbase;

		u32           pbase;

		u32           len;

	} mmio;

drivers/video/savage/savagefb_driver.c

+39 −0
Original line number Diff line number Diff line
@@ -1623,8 +1623,46 @@ static void savagefb_restore_state(struct fb_info *info) 
	savagefb_blank(FB_BLANK_UNBLANK, info);

}



static int savagefb_open(struct fb_info *info, int user)

{

	struct savagefb_par *par = info->par;



	mutex_lock(&par->open_lock);



	if (!par->open_count) {

		memset(&par->vgastate, 0, sizeof(par->vgastate));

		par->vgastate.flags = VGA_SAVE_CMAP | VGA_SAVE_FONTS |

			VGA_SAVE_MODE;

		par->vgastate.vgabase = par->mmio.vbase + 0x8000;

		save_vga(&par->vgastate);

		savage_get_default_par(par, &par->initial);

	}



	par->open_count++;

	mutex_unlock(&par->open_lock);

	return 0;

}



static int savagefb_release(struct fb_info *info, int user)

{

	struct savagefb_par *par = info->par;



	mutex_lock(&par->open_lock);



	if (par->open_count == 1) {

		savage_set_default_par(par, &par->initial);

		restore_vga(&par->vgastate);

	}



	par->open_count--;

	mutex_unlock(&par->open_lock);

	return 0;

}



static struct fb_ops savagefb_ops = {

	.owner          = THIS_MODULE,

	.fb_open        = savagefb_open,

	.fb_release     = savagefb_release,

	.fb_check_var   = savagefb_check_var,

	.fb_set_par     = savagefb_set_par,

	.fb_setcolreg   = savagefb_setcolreg,
@@ -2173,6 +2211,7 @@ static int __devinit savagefb_probe(struct pci_dev* dev, 
	if (!info)

		return -ENOMEM;

	par = info->par;

	mutex_init(&par->open_lock);

	err = pci_enable_device(dev);

	if (err)

		goto failed_enable;

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