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Date: Thu, 22 Feb 2007 08:05:33 +0800
From: "Antonino A. Daplas" <adaplas@...il.com>
To: Ondrej Zajicek <santiago@...reenet.org>
Cc: James Simmons <jsimmons@...radead.org>,
Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
linux-fbdev-devel@...ts.sourceforge.net,
Jiri Slaby <jirislaby@...il.com>
Subject: Re: [PATCH] fbdev driver for S3 Trio/Virge, updated
On Fri, 2007-02-09 at 20:34 +0100, Ondrej Zajicek wrote:
> This patch adds driver for S3 Trio / S3 Virge. Driver is tested
> with most versions of S3 Trio and S3 Virge, on i386.
> It is tested both as compiled-in and module. It is against
> linux-2.6.20 .
>
> This is version 3. There are some minor modifications from version 2
> (mostly coding style cleanups).
Nice, the first driver to use tileblit :-)
Since this driver is already in the -mm tree, can you resubmit a diff
against that?
> +
> +static const struct vga_regset s3_h_total_regs[] = {{0x00, 0, 7}, {0x5D, 0, 0}, VGA_REGSET_END};
> +static const struct vga_regset s3_h_display_regs[] = {{0x01, 0, 7}, {0x5D, 1, 1}, VGA_REGSET_END};
> +static const struct vga_regset s3_h_blank_start_regs[] = {{0x02, 0, 7}, {0x5D, 2, 2}, VGA_REGSET_END};
> +static const struct vga_regset s3_h_blank_end_regs[] = {{0x03, 0, 4}, {0x05, 7, 7}, VGA_REGSET_END};
> +static const struct vga_regset s3_h_sync_start_regs[] = {{0x04, 0, 7}, {0x5D, 4, 4}, VGA_REGSET_END};
> +static const struct vga_regset s3_h_sync_end_regs[] = {{0x05, 0, 4}, VGA_REGSET_END};
> +
> +static const struct vga_regset s3_v_total_regs[] = {{0x06, 0, 7}, {0x07, 0, 0}, {0x07, 5, 5}, {0x5E, 0, 0}, VGA_REGSET_END};
> +static const struct vga_regset s3_v_display_regs[] = {{0x12, 0, 7}, {0x07, 1, 1}, {0x07, 6, 6}, {0x5E, 1, 1}, VGA_REGSET_END};
> +static const struct vga_regset s3_v_blank_start_regs[] = {{0x15, 0, 7}, {0x07, 3, 3}, {0x09, 5, 5}, {0x5E, 2, 2}, VGA_REGSET_END};
> +static const struct vga_regset s3_v_blank_end_regs[] = {{0x16, 0, 7}, VGA_REGSET_END};
> +static const struct vga_regset s3_v_sync_start_regs[] = {{0x10, 0, 7}, {0x07, 2, 2}, {0x07, 7, 7}, {0x5E, 4, 4}, VGA_REGSET_END};
> +static const struct vga_regset s3_v_sync_end_regs[] = {{0x11, 0, 3}, VGA_REGSET_END};
> +
> +static const struct vga_regset s3_line_compare_regs[] = {{0x18, 0, 7}, {0x07, 4, 4}, {0x09, 6, 6}, {0x5E, 6, 6}, VGA_REGSET_END};
> +static const struct vga_regset s3_start_address_regs[] = {{0x0d, 0, 7}, {0x0c, 0, 7}, {0x31, 4, 5}, {0x51, 0, 1}, VGA_REGSET_END};
> +static const struct vga_regset s3_offset_regs[] = {{0x13, 0, 7}, {0x51, 4, 5}, VGA_REGSET_END}; /* set 0x43 bit 2 to 0 */
> +
Within reason, try to limit each line to 80 columns.
> +
> +/* image data is MSB-first, fb structure is MSB-first too */
> +static inline u32 expand_color(u32 c)
> +{
> + return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
> +}
> +
> +/* s3fb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
Hmn, same thing with vga16fb... Perhaps we should bring back the
fontwidth flag of 2.2 and 2.4 kernels.
> +
> +static int s3fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
> + u_int transp, struct fb_info *fb)
> +{
> + switch (fb->var.bits_per_pixel) {
> + case 0:
> + case 4:
> + if (regno >= 16)
> + return -EINVAL;
> +
> + if ((fb->var.bits_per_pixel == 4) &&
> + (fb->var.nonstd == 0)) {
> + outb(0xF0, VGA_PEL_MSK);
> + outb(regno*16, VGA_PEL_IW);
> + } else {
> + outb(0x0F, VGA_PEL_MSK);
> + outb(regno, VGA_PEL_IW);
> + }
> + outb(red >> 10, VGA_PEL_D);
> + outb(green >> 10, VGA_PEL_D);
> + outb(blue >> 10, VGA_PEL_D);
> + break;
> + case 8:
> + if (regno >= 256)
> + return -EINVAL;
> +
> + outb(0xFF, VGA_PEL_MSK);
> + outb(regno, VGA_PEL_IW);
> + outb(red >> 10, VGA_PEL_D);
> + outb(green >> 10, VGA_PEL_D);
> + outb(blue >> 10, VGA_PEL_D);
> + break;
> + case 16:
> + if (regno >= 16)
> + return -EINVAL;
Just return success without doing anything. I presume this is
truecolor.
> +
> + if (fb->var.green.length == 5)
> + ((u32*)fb->pseudo_palette)[regno] = ((red & 0xF800) >> 1) |
> + ((green & 0xF800) >> 6) | ((blue & 0xF800) >> 11);
> + else if (fb->var.green.length == 6)
> + ((u32*)fb->pseudo_palette)[regno] = (red & 0xF800) |
> + ((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
> + else return -EINVAL;
Same here.
> + break;
> + case 24:
> + case 32:
> + if (regno >= 16)
> + return -EINVAL;
And here.
> +
> + ((u32*)fb->pseudo_palette)[regno] = ((transp & 0xFF00) << 16) | ((red & 0xFF00) << 8) |
> + (green & 0xFF00) | ((blue & 0xFF00) >> 8);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
[snip]
> +
> +/* Pan the display */
> +
> +static int s3fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) {
> +
> + unsigned int offset;
> +
> + /* Validate the offsets */
> + if ((var->xoffset + var->xres) > var->xres_virtual)
> + return -EINVAL;
> + if ((var->yoffset + var->yres) > var->yres_virtual)
> + return -EINVAL;
You need not validate the offsets, fb_pan_display() does this for you.
> +
> + /* Calculate the offset */
> + if (var->bits_per_pixel == 0) {
> + offset = (var->yoffset / 16) * (var->xres_virtual / 2) + (var->xoffset / 2);
> + offset = offset >> 2;
> + } else {
> + offset = (var->yoffset * info->fix.line_length) +
> + (var->xoffset * var->bits_per_pixel / 8);
> + offset = offset >> 2;
> + }
> +
> + /* Set the offset */
> + svga_wcrt_multi(s3_start_address_regs, offset);
> +
> + return 0;
> +}
> +
> +/* ------------------------------------------------------------------------- */
> +
> +/* Frame buffer operations */
> +
> +static struct fb_ops s3fb_ops = {
> + .owner = THIS_MODULE,
> + .fb_open = s3fb_open,
> + .fb_release = s3fb_release,
> + .fb_check_var = s3fb_check_var,
> + .fb_set_par = s3fb_set_par,
> + .fb_setcolreg = s3fb_setcolreg,
> + .fb_blank = s3fb_blank,
> + .fb_pan_display = s3fb_pan_display,
> + .fb_fillrect = s3fb_fillrect,
> + .fb_copyarea = cfb_copyarea,
No s3fb_copyarea :-). Usually it's the other way around,
imageblit is unaccelerated.
> + .fb_imageblit = s3fb_imageblit,
> +};
> +
Tony
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