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From a9b3500bd14609750a2337e866e1df62627c1bac Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@nokia.com>
Date: Mon, 20 Apr 2009 14:55:33 +0200
Subject: [PATCH] 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.
---
drivers/video/omap2/omapfb/omapfb-sysfs.c | 42 ++++++++++++++++++++++++++++-
1 files changed, 41 insertions(+), 1 deletions(-)
diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c
index 2c88718..4e3da42 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),
--
1.5.6.5
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