drm: tegra: fix front_porch <-> back_porch mixup
Fixes wrong picture offset observed when using HDMI output with a
Technisat HD TV.
Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Mark Zhang <markz@nvidia.com>
Tested-by: Mark Zhang <markz@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index ab40164..81ea934 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -479,7 +479,7 @@
return;
}
- h_front_porch = mode->htotal - mode->hsync_end;
+ h_front_porch = mode->hsync_start - mode->hdisplay;
memset(&frame, 0, sizeof(frame));
frame.r = HDMI_AVI_R_SAME;
@@ -634,8 +634,8 @@
pclk = mode->clock * 1000;
h_sync_width = mode->hsync_end - mode->hsync_start;
- h_front_porch = mode->htotal - mode->hsync_end;
- h_back_porch = mode->hsync_start - mode->hdisplay;
+ h_back_porch = mode->htotal - mode->hsync_end;
+ h_front_porch = mode->hsync_start - mode->hdisplay;
err = regulator_enable(hdmi->vdd);
if (err < 0) {