drm/udl: port over blanking code from udlfb.

This ports over the dpms code from udlfb, and should mean
a better chance of turning on some udl devices.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 37 insertions, 7 deletions

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index ac2d717714ce..f5dd89e891de 100644
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -45,12 +45,25 @@ static char *udl_vidreg_unlock(char *buf)
  *  0x01 H and V sync off (screen blank but powered)
  *  0x07 DPMS powerdown (requires modeset to come back)
  */
-static char *udl_enable_hvsync(char *buf, bool enable)
+static char *udl_set_blank(char *buf, int dpms_mode)
 {
-        if (enable)
-                return udl_set_register(buf, 0x1F, 0x00);
-        else
-                return udl_set_register(buf, 0x1F, 0x07);
+        u8 reg;
+        switch (dpms_mode) {
+        case DRM_MODE_DPMS_OFF:
+                reg = 0x07;
+                break;
+        case DRM_MODE_DPMS_STANDBY:
+                reg = 0x05;
+                break;
+        case DRM_MODE_DPMS_SUSPEND:
+                reg = 0x01;
+                break;
+        case DRM_MODE_DPMS_ON:
+                reg = 0x00;
+                break;
+        }
+
+        return udl_set_register(buf, 0x1f, reg);
 }
 
 static char *udl_set_color_depth(char *buf, u8 selection)
@@ -199,6 +212,20 @@ static char *udl_set_vid_cmds(char *wrptr, struct drm_display_mode *mode)
         return wrptr;
 }
 
+static char *udl_dummy_render(char *wrptr)
+{
+        *wrptr++ = 0xAF;
+        *wrptr++ = 0x6A; /* copy */
+        *wrptr++ = 0x00; /* from addr */
+        *wrptr++ = 0x00;
+        *wrptr++ = 0x00;
+        *wrptr++ = 0x01; /* one pixel */
+        *wrptr++ = 0x00; /* to address */
+        *wrptr++ = 0x00;
+        *wrptr++ = 0x00;
+        return wrptr;
+}
+
 static int udl_crtc_write_mode_to_hw(struct drm_crtc *crtc)
 {
         struct drm_device *dev = crtc->dev;
@@ -235,9 +262,10 @@ static void udl_crtc_dpms(struct drm_crtc *crtc, int mode)
 
                 buf = (char *)urb->transfer_buffer;
                 buf = udl_vidreg_lock(buf);
-                buf = udl_enable_hvsync(buf, false);
+                buf = udl_set_blank(buf, mode);
                 buf = udl_vidreg_unlock(buf);
 
+                buf = udl_dummy_render(buf);
                 retval = udl_submit_urb(dev, urb, buf - (char *)
                                         urb->transfer_buffer);
         } else {
@@ -306,9 +334,11 @@ static int udl_crtc_mode_set(struct drm_crtc *crtc,
         wrptr = udl_set_base8bpp(wrptr, 2 * mode->vdisplay * mode->hdisplay);
 
         wrptr = udl_set_vid_cmds(wrptr, adjusted_mode);
-        wrptr = udl_enable_hvsync(wrptr, true);
+        wrptr = udl_set_blank(wrptr, DRM_MODE_DPMS_ON);
         wrptr = udl_vidreg_unlock(wrptr);
 
+        wrptr = udl_dummy_render(wrptr);
+
         ufb->active_16 = true;
         if (old_fb) {
                 struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);