[PATCH 3/11] staging: udlfb: add DPMS support
Bernie Thompson
bernie at plugable.com
Wed Aug 18 20:39:26 UTC 2010
Add ability to power off monitor with standard blanking interface
Used by X servers and others to manage power of dislpay
Signed-off-by: Bernie Thompson <bernie at plugable.com>
Index: b/drivers/staging/udlfb/udlfb.c
===================================================================
--- a/drivers/staging/udlfb/udlfb.c 2010-08-18 08:05:15.000000000 -0700
+++ b/drivers/staging/udlfb/udlfb.c 2010-08-18 08:05:49.000000000 -0700
@@ -108,13 +108,16 @@ static char *dlfb_vidreg_unlock(char *bu
/*
* On/Off for driving the DisplayLink framebuffer to the display
+ * 0x00 H and V sync on
+ * 0x01 H and V sync off (screen blank but powered)
+ * 0x07 DPMS powerdown (requires modeset to come back)
*/
static char *dlfb_enable_hvsync(char *buf, bool enable)
{
if (enable)
return dlfb_set_register(buf, 0x1F, 0x00);
else
- return dlfb_set_register(buf, 0x1F, 0x01);
+ return dlfb_set_register(buf, 0x1F, 0x07);
}
static char *dlfb_set_color_depth(char *buf, u8 selection)
@@ -936,30 +939,31 @@ static int dlfb_ops_set_par(struct fb_in
return dlfb_set_video_mode(dev, &info->var);
}
+/*
+ * In order to come back from full DPMS off, we need to set the mode again
+ */
static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
{
struct dlfb_data *dev = info->par;
+
+ if (blank_mode != FB_BLANK_UNBLANK) {
char *bufptr;
struct urb *urb;
urb = dlfb_get_urb(dev);
if (!urb)
return 0;
- bufptr = (char *) urb->transfer_buffer;
-
- /* overloading usb_active. UNBLANK can conflict with teardown */
+ bufptr = (char *) urb->transfer_buffer;
bufptr = dlfb_vidreg_lock(bufptr);
- if (blank_mode != FB_BLANK_UNBLANK) {
- atomic_set(&dev->usb_active, 0);
bufptr = dlfb_enable_hvsync(bufptr, false);
- } else {
- atomic_set(&dev->usb_active, 1);
- bufptr = dlfb_enable_hvsync(bufptr, true);
- }
bufptr = dlfb_vidreg_unlock(bufptr);
- dlfb_submit_urb(dev, urb, bufptr - (char *) urb->transfer_buffer);
+ dlfb_submit_urb(dev, urb, bufptr -
+ (char *) urb->transfer_buffer);
+ } else {
+ dlfb_set_video_mode(dev, &info->var);
+ }
return 0;
}
More information about the devel
mailing list