linux-kernel - [PATCH] s3fb: maximize virtual vertical size for fast scrolling

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Date:	Sun, 20 Feb 2011 19:37:15 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Ondrej Zajicek <santiago@...reenet.org>
Cc:	linux-fbdev@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: [PATCH] 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@...nbow-software.org>

--- linux-2.6.38-rc4-/drivers/video/s3fb.c	2011-02-20 19:11:28.000000000 +0100
+++ linux-2.6.38-rc4/drivers/video/s3fb.c	2011-02-20 19:17:04.000000000 +0100
@@ -1060,6 +1060,14 @@ static int __devinit s3_pci_probe(struct
 		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");

-- 
Ondrej Zary
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