[PATCH] vesafb: Drop blank hook

From: Bugzilla Bug 5351

"After resuming from S3 (suspended while in X), the LCD panel stays black .
 However, the laptop is up again, and I can SSH into it from another
machine.

I can get the panel working again, when I first direct video output to the
CRT output of the laptop, and then back to LCD (done by repeatedly hitting
Fn+F5 buttons on the Toshiba, which directs output to either LCD, CRT or
TV) None of this ever happened with older kernels."

This bug is due to the recently added vesafb_blank() method in vesafb.  It
works with CRT displays, but has a high incidence of problems in laptop
users.  Since CRT users don't really get that much benefit from hardware
blanking, drop support for this.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 1 insertions, 44 deletions

diff --git a/arch/i386/boot/video.S b/arch/i386/boot/video.S
index 92f669470142..2ac40c8244c4 100644
--- a/arch/i386/boot/video.S
+++ b/arch/i386/boot/video.S
@@ -97,7 +97,6 @@
 #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
@@ -234,10 +233,6 @@ 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
diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c
index 3e58ddc2bc38..55e28ba57b43 100644
--- a/drivers/video/vesafb.c
+++ b/drivers/video/vesafb.c
@@ -57,7 +57,6 @@ static unsigned short  *pmi_base  = NULL;
 static void            (*pmi_start)(void);
 static void            (*pmi_pal)(void);
 static int             depth;
-static int             vga_compat;
 
 /* --------------------------------------------------------------------- */
 
@@ -90,37 +89,6 @@ 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;
-
-                if (blank == FB_BLANK_POWERDOWN) {
-                        seq = 0x20;
-                        crtc17 = 0x00;
-                        err = 0;
-                } else {
-                        seq = 0x00;
-                        crtc17 = 0x80;
-                        err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
-                }
-
-                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)
 {
@@ -205,7 +173,6 @@ 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,
@@ -459,10 +426,6 @@ static int __init vesafb_probe(struct platform_device *dev)
         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;
diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
index 76850b75b3f6..6336987dae62 100644
--- a/include/linux/screen_info.h
+++ b/include/linux/screen_info.h
@@ -41,8 +41,7 @@ struct screen_info {
         u16 vesapm_off;         /* 0x30 */
         u16 pages;              /* 0x32 */
         u16 vesa_attributes;    /* 0x34 */
-        u32  capabilities;      /* 0x36 */
-                                /* 0x3a -- 0x3f reserved for future expansion */
+                                /* 0x36 -- 0x3f reserved for future expansion */
 };
 
 extern struct screen_info screen_info;