OMAP: DSS2: OMAPFB: Implement auto-update mode

Implement auto-update mode for manual-update displays. omapfb driver
uses a delayed work to update the display with a constant rate.

The update mode can be changed via OMAPFB_SET_UPDATE_MODE ioctl, which
previously called omapdss but is now handled inside omapfb, and a new
sysfs file, "update_mode".

The update interval is by default 20 times per second, but can be
changed via "auto_update_freq" module parameter. There is also a new
module parameter "auto_update", which will make omapfb start manual
update displays in auto-update mode.

This auto-update mode can be used for testing if the userspace does not
support manual update displays properly. However, it is a very
inefficient solution, and should be considered more as a hack for
testing than something that could be used as a long term solution.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c
index 2f5e817b2a9a..153bf1aceebc 100644
--- a/drivers/video/omap2/omapfb/omapfb-sysfs.c
+++ b/drivers/video/omap2/omapfb/omapfb-sysfs.c
@@ -518,6 +518,39 @@ static ssize_t show_virt(struct device *dev,
         return snprintf(buf, PAGE_SIZE, "%p\n", ofbi->region->vaddr);
 }
 
+static ssize_t show_upd_mode(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct fb_info *fbi = dev_get_drvdata(dev);
+        enum omapfb_update_mode mode;
+        int r;
+
+        r = omapfb_get_update_mode(fbi, &mode);
+
+        if (r)
+                return r;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", (unsigned)mode);
+}
+
+static ssize_t store_upd_mode(struct device *dev, struct device_attribute *attr,
+                const char *buf, size_t count)
+{
+        struct fb_info *fbi = dev_get_drvdata(dev);
+        unsigned mode;
+        int r;
+
+        r = kstrtouint(buf, 0, &mode);
+        if (r)
+                return r;
+
+        r = omapfb_set_update_mode(fbi, mode);
+        if (r)
+                return r;
+
+        return count;
+}
+
 static struct device_attribute omapfb_attrs[] = {
         __ATTR(rotate_type, S_IRUGO | S_IWUSR, show_rotate_type,
                         store_rotate_type),
@@ -528,6 +561,7 @@ static struct device_attribute omapfb_attrs[] = {
                         store_overlays_rotate),
         __ATTR(phys_addr, S_IRUGO, show_phys, NULL),
         __ATTR(virt_addr, S_IRUGO, show_virt, NULL),
+        __ATTR(update_mode, S_IRUGO | S_IWUSR, show_upd_mode, store_upd_mode),
 };
 
 int omapfb_create_sysfs(struct omapfb2_device *fbdev)