From: Imre Deak <imre.deak@nokia.com>
Date: Mon, 20 Apr 2009 12:55:33 +0000 (+0200)
Subject: DSS2: add sysfs entry for seting the rotate type
X-Git-Tag: Release-2010-05/1~2^2~98
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=692f1b97c597b3f2885c88328c7c990466984aad

DSS2: add sysfs entry for seting the rotate type

This can help in utilizing VRAM memory better. Since with VRFB rotation
we waste a lot of physical memory due to the VRFB HW design, provide the
possibility to turn it off and free the extra memory for the use by other
planes for example.
---

diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c
index 2c887186152f..4e3da42a7bc8 100644
--- a/drivers/video/omap2/omapfb/omapfb-sysfs.c
+++ b/drivers/video/omap2/omapfb/omapfb-sysfs.c
@@ -43,6 +43,46 @@ static ssize_t show_rotate_type(struct device *dev,
 	return snprintf(buf, PAGE_SIZE, "%d\n", ofbi->rotation_type);
 }
 
+static ssize_t store_rotate_type(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct fb_info *fbi = dev_get_drvdata(dev);
+	struct omapfb_info *ofbi = FB2OFB(fbi);
+	struct omapfb2_device *fbdev = ofbi->fbdev;
+	enum omap_dss_rotation_type rot_type;
+	int r;
+
+	rot_type = simple_strtoul(buf, NULL, 0);
+
+	if (rot_type != OMAP_DSS_ROT_DMA && rot_type != OMAP_DSS_ROT_VRFB)
+		return -EINVAL;
+
+	omapfb_lock(fbdev);
+
+	r = 0;
+	if (rot_type == ofbi->rotation_type)
+		goto out;
+
+	r = -EBUSY;
+	if (ofbi->region.size)
+		goto out;
+
+	ofbi->rotation_type = rot_type;
+
+	/*
+	 * Since the VRAM for this FB is not allocated at the moment we don't need to
+	 * do any further parameter checking at this point.
+	 */
+
+	r = count;
+out:
+	omapfb_unlock(fbdev);
+
+	return r;
+}
+
+
 static ssize_t show_mirror(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -327,7 +367,7 @@ static ssize_t show_virt(struct device *dev,
 }
 
 static struct device_attribute omapfb_attrs[] = {
-	__ATTR(rotate_type, S_IRUGO, show_rotate_type, NULL),
+	__ATTR(rotate_type, S_IRUGO | S_IWUSR, show_rotate_type, store_rotate_type),
 	__ATTR(mirror, S_IRUGO | S_IWUSR, show_mirror, store_mirror),
 	__ATTR(size, S_IRUGO | S_IWUSR, show_size, store_size),
 	__ATTR(overlays, S_IRUGO | S_IWUSR, show_overlays, store_overlays),