[src/trunk]: src/sys/arch/arm/nvidia If we are going to be doing read/modify/...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e92e44d19686
branches:  trunk
changeset: 811789:e92e44d19686
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sun Nov 15 14:39:12 2015 +0000

description:
If we are going to be doing read/modify/write in triple-buffered mode, make sure we don't read back the buffered values and not the active ones

diffstat:

 sys/arch/arm/nvidia/tegra_drm_mode.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r 53e0c90cacae -r e92e44d19686 sys/arch/arm/nvidia/tegra_drm_mode.c
--- a/sys/arch/arm/nvidia/tegra_drm_mode.c      Sun Nov 15 13:50:10 2015 +0000
+++ b/sys/arch/arm/nvidia/tegra_drm_mode.c      Sun Nov 15 14:39:12 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tegra_drm_mode.c,v 1.7 2015/11/14 23:16:41 jmcneill Exp $ */
+/* $NetBSD: tegra_drm_mode.c,v 1.8 2015/11/15 14:39:12 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tegra_drm_mode.c,v 1.7 2015/11/14 23:16:41 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tegra_drm_mode.c,v 1.8 2015/11/15 14:39:12 jmcneill Exp $");
 
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
@@ -680,8 +680,8 @@
        struct tegra_crtc *tegra_crtc = to_tegra_crtc(crtc);
 
        /* Access control */
-       DC_WRITE(tegra_crtc, DC_CMD_STATE_ACCESS_REG,
-           DC_CMD_STATE_ACCESS_READ_MUX);
+       DC_WRITE(tegra_crtc, DC_CMD_STATE_ACCESS_REG, 0);
+
        /* Enable window A programming */
        DC_WRITE(tegra_crtc, DC_CMD_DISPLAY_WINDOW_HEADER_REG,
            DC_CMD_DISPLAY_WINDOW_HEADER_WINDOW_A_SELECT);