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>

2 files changed, 7 insertions, 7 deletions

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 074410371e2a..54683e430c77 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -102,12 +102,12 @@ static int tegra_dc_set_timings(struct tegra_dc *dc,
                 ((mode->hsync_end - mode->hsync_start) <<  0);
         tegra_dc_writel(dc, value, DC_DISP_SYNC_WIDTH);
 
-        value = ((mode->vsync_start - mode->vdisplay) << 16) |
-                ((mode->hsync_start - mode->hdisplay) <<  0);
-        tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
-
         value = ((mode->vtotal - mode->vsync_end) << 16) |
                 ((mode->htotal - mode->hsync_end) <<  0);
+        tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
+
+        value = ((mode->vsync_start - mode->vdisplay) << 16) |
+                ((mode->hsync_start - mode->hdisplay) <<  0);
         tegra_dc_writel(dc, value, DC_DISP_FRONT_PORCH);
 
         value = (mode->vdisplay << 16) | mode->hdisplay;
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index ab4016412bbf..81ea934214f1 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -479,7 +479,7 @@ static void tegra_hdmi_setup_avi_infoframe(struct tegra_hdmi *hdmi,
                 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 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
 
         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) {