drm/radeon/atom: fix dithering on certain panels

From Alex Deucher
9102ef0d290f01247918f5a519d8fa4a96eaf370 in ubuntu 3.8
642528355c694f5ed68f6bff9ff520326a249f99 in mainline linux

diff --git a/sys/dev/pci/drm/radeon/atombios_encoders.c b/sys/dev/pci/drm/radeon/atombios_encoders.c
index 06afa21..02789d4 100644 (file)
--- a/sys/dev/pci/drm/radeon/atombios_encoders.c
+++ b/sys/dev/pci/drm/radeon/atombios_encoders.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: atombios_encoders.c,v 1.7 2014/04/12 06:05:53 jsg Exp $       */
+/*     $OpenBSD: atombios_encoders.c,v 1.8 2014/08/08 16:35:56 jsg Exp $       */
 /*
  * Copyright 2007-11 Advanced Micro Devices, Inc.
  * Copyright 2008 Red Hat Inc.
@@ -1876,8 +1876,11 @@ atombios_set_encoder_crtc_source(struct drm_encoder *encoder)
                                        args.v2.ucEncodeMode = ATOM_ENCODER_MODE_CRT;
                                else
                                        args.v2.ucEncodeMode = atombios_get_encoder_mode(encoder);
-                       } else
+                       } else if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
+                               args.v2.ucEncodeMode = ATOM_ENCODER_MODE_LVDS;
+                       } else {
                                args.v2.ucEncodeMode = atombios_get_encoder_mode(encoder);
+                       }
                        switch (radeon_encoder->encoder_id) {
                        case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
                        case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1: