cirrusfb: do not calculate line length twice
Krzysztof Helt [Tue, 31 Mar 2009 22:25:06 +0000 (15:25 -0700)]
A line length is calculated twice: first in the cirrusfb_decode_var() then
in the cirrusfb_set_par_foo().

Use the first calculated value.  A nice side effect is that 32bpp mode
works now.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Geert Uytterhoeven <geert.uytterhoeven@gmail.com>
Cc: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/cirrusfb.c

index 378d60e..53572c0 100644 (file)
@@ -694,7 +694,8 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
        struct cirrusfb_regs regs;
        u8 __iomem *regbase = cinfo->regbase;
        unsigned char tmp;
-       int offset = 0, err;
+       int err;
+       int pitch;
        const struct cirrusfb_board_info_rec *bi;
        int hdispend, hsyncstart, hsyncend, htotal;
        int yres, vdispend, vsyncstart, vsyncend, vtotal;
@@ -1027,7 +1028,6 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                vga_wseq(regbase, VGA_SEQ_MEMORY_MODE, 0x06);
                /* plane mask: only write to first plane */
                vga_wseq(regbase, VGA_SEQ_PLANE_WRITE, 0x01);
-               offset = var->xres_virtual / 16;
        }
 
        /******************************************************
@@ -1113,7 +1113,6 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                vga_wseq(regbase, VGA_SEQ_MEMORY_MODE, 0x0a);
                /* plane mask: enable writing to all 4 planes */
                vga_wseq(regbase, VGA_SEQ_PLANE_WRITE, 0xff);
-               offset = var->xres_virtual / 8;
        }
 
        /******************************************************
@@ -1190,7 +1189,6 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                vga_wseq(regbase, VGA_SEQ_MEMORY_MODE, 0x0a);
                /* plane mask: enable writing to all 4 planes */
                vga_wseq(regbase, VGA_SEQ_PLANE_WRITE, 0xff);
-               offset = var->xres_virtual / 4;
        }
 
        /******************************************************
@@ -1263,7 +1261,6 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                vga_wseq(regbase, VGA_SEQ_MEMORY_MODE, 0x0a);
                /* plane mask: enable writing to all 4 planes */
                vga_wseq(regbase, VGA_SEQ_PLANE_WRITE, 0xff);
-               offset = var->xres_virtual / 4;
        }
 
        /******************************************************
@@ -1277,9 +1274,10 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
                        "What's this? requested color depth == %d.\n",
                        var->bits_per_pixel);
 
-       vga_wcrt(regbase, VGA_CRTC_OFFSET, offset & 0xff);
+       pitch = info->fix.line_length >> 3;
+       vga_wcrt(regbase, VGA_CRTC_OFFSET, pitch & 0xff);
        tmp = 0x22;
-       if (offset & 0x100)
+       if (pitch & 0x100)
                tmp |= 0x10;    /* offset overflow bit */
 
        /* screen start addr #16-18, fastpagemode cycles */
@@ -1287,7 +1285,7 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
 
        /* screen start address bit 19 */
        if (cirrusfb_board_info[cinfo->btype].scrn_start_bit19)
-               vga_wcrt(regbase, CL_CRT1D, 0x00);
+               vga_wcrt(regbase, CL_CRT1D, (pitch >> 9) & 1);
 
        if (cinfo->btype == BT_LAGUNA ||
            cinfo->btype == BT_GD5480) {