video: tegra: dc: fix CEA timings for hdmi

Fixes the issue that timings are 1 clock too long in 720p and 1080p.

Bug 847774

Original-Change-Id: I3925ec1e64537daa27d6e697abe522ea17a87e1e
Reviewed-on: http://git-master/r/42488
Reviewed-by: Kevin Huang <kevinh@nvidia.com>
Reviewed-by: Jonathan Mayo <jmayo@nvidia.com>
Tested-by: Jonathan Mayo <jmayo@nvidia.com>

Rebase-Id: Rafbae1d4ae46bb13509af7ca59709e9f526bf6eb

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/video/tegra/dc/dc.c b/drivers/video/tegra/dc/dc.c
index 549852789..8cd3a02ea 100644
--- a/drivers/video/tegra/dc/dc.c
+++ b/drivers/video/tegra/dc/dc.c
@@ -1542,10 +1542,12 @@ int tegra_dc_set_fb_mode(struct tegra_dc *dc,
         mode.h_front_porch = fbmode->right_margin;
         mode.v_front_porch = fbmode->lower_margin;
         mode.stereo_mode = stereo_mode;
-        if (calc_ref_to_sync(&mode)) {
-                dev_err(&dc->ndev->dev, "bad href/vref values, overriding.\n");
-                mode.h_ref_to_sync = 11;
+        if (dc->out->type == TEGRA_DC_OUT_HDMI) {
+                /* HDMI controller requires h_ref=1, v_ref=1 */
+                mode.h_ref_to_sync = 1;
                 mode.v_ref_to_sync = 1;
+        } else {
+                calc_ref_to_sync(&mode);
         }
         if (!check_ref_to_sync(&mode)) {
                 dev_err(&dc->ndev->dev,