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s3fb: maximize virtual vertical size for fast scrolling 

Maximize virtual vertical framebuffer size during init to allow fast scrolling
(accelerated by panning).

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Ondrej Zajicek <santiago@crfreenet.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Ondrej Zary 2011-03-01 19:18:08 +00:00 committed by Paul Mundt
parent 6a2f6d5e97
commit 99d054d825
1 changed files with 8 additions and 0 deletions
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8
drivers/video/s3fb.c
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@ -1053,6 +1053,14 @@ static int __devinit s3_pci_probe(struct pci_dev *dev, const struct pci_device_i
goto err_find_mode;
}
/* maximize virtual vertical size for fast scrolling */
info->var.yres_virtual = info->fix.smem_len * 8 /
(info->var.bits_per_pixel * info->var.xres_virtual);
if (info->var.yres_virtual < info->var.yres) {
dev_err(info->device, "virtual vertical size smaller than real\n");
goto err_find_mode;
}
rc = fb_alloc_cmap(&info->cmap, 256, 0);
if (rc < 0) {
dev_err(info->device, "cannot allocate colormap\n");