From: Ondrej Zary <linux@rainbow-software.org>
Date: Tue, 1 Mar 2011 19:18:08 +0000 (+0000)
Subject: s3fb: maximize virtual vertical size for fast scrolling
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=99d054d8253b1dbc6ab2d4ebcb25ad4a4e6ba1c8;p=linux-beck.git

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>
---

diff --git a/drivers/video/s3fb.c b/drivers/video/s3fb.c
index 55a94b94a326..9f9be9f37f2e 100644
--- a/drivers/video/s3fb.c
+++ b/drivers/video/s3fb.c
@@ -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");