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[PATCH] vesafb: Add blanking support 

Add rudimentary support by manipulating the VGA registers.  However, not
all vesa modes are VGA compatible, so VGA compatiblity is checked first.
Only 2 levels are supported, powerup and powerdown.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas 2005-09-09 13:04:31 -07:00 committed by Linus Torvalds
parent 7726e9e10f
commit d2d58384fc
3 changed files with 45 additions and 1 deletions
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5
arch/i386/boot/video.S
View File

@ -97,6 +97,7 @@
#define PARAM_VESAPM_OFF 0x30
#define PARAM_LFB_PAGES 0x32
#define PARAM_VESA_ATTRIB 0x34
#define PARAM_CAPABILITIES 0x36
/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
#ifdef CONFIG_VIDEO_RETAIN
@ -233,6 +234,10 @@ mopar_gr:
movw 18(%di), %ax
movl %eax, %fs:(PARAM_LFB_SIZE)
# store mode capabilities
movl 10(%di), %eax
movl %eax, %fs:(PARAM_CAPABILITIES)
# switching the DAC to 8-bit is for <= 8 bpp only
movw %fs:(PARAM_LFB_DEPTH), %ax
cmpw $8, %ax

38
drivers/video/vesafb.c
View File

@ -19,6 +19,7 @@
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <video/vga.h>
#include <asm/io.h>
#include <asm/mtrr.h>
@ -54,6 +55,7 @@ static unsigned short *pmi_base = NULL;
static void (*pmi_start)(void);
static void (*pmi_pal)(void);
static int depth;
static int vga_compat;
/* --------------------------------------------------------------------- */
@ -86,6 +88,37 @@ static int vesafb_pan_display(struct fb_var_screeninfo *var,
return 0;
}
static int vesafb_blank(int blank, struct fb_info *info)
{
int err = 1;
if (vga_compat) {
int loop = 10000;
u8 seq = 0, crtc17 = 0;
err = 0;
if (blank) {
seq = 0x20;
crtc17 = 0x00;
} else {
seq = 0x00;
crtc17 = 0x80;
}
vga_wseq(NULL, 0x00, 0x01);
seq |= vga_rseq(NULL, 0x01) & ~0x20;
vga_wseq(NULL, 0x00, seq);
crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
while (loop--);
vga_wcrt(NULL, 0x17, crtc17);
vga_wseq(NULL, 0x00, 0x03);
}
return err;
}
static void vesa_setpalette(int regno, unsigned red, unsigned green,
unsigned blue)
{
@ -176,6 +209,7 @@ static struct fb_ops vesafb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = vesafb_setcolreg,
.fb_pan_display = vesafb_pan_display,
.fb_blank = vesafb_blank,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
@ -429,6 +463,10 @@ static int __init vesafb_probe(struct device *device)
info->flags = FBINFO_FLAG_DEFAULT |
(ypan) ? FBINFO_HWACCEL_YPAN : 0;
vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
printk("vesafb: Mode is %sVGA compatible\n",
(vga_compat) ? "" : "not ");
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENOMEM;
goto err;

3
include/linux/tty.h
View File

@ -74,7 +74,8 @@ struct screen_info {
u16 vesapm_off; /* 0x30 */
u16 pages; /* 0x32 */
u16 vesa_attributes; /* 0x34 */
/* 0x36 -- 0x3f reserved for future expansion */
u32 capabilities; /* 0x36 */
/* 0x3a -- 0x3f reserved for future expansion */
};
extern struct screen_info screen_info;