From b66013edab6e2149beb55eb1021926fd7ea26da7 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Thu, 15 Sep 2016 17:52:17 +0100
Subject: [PATCH] drm/vc4: Fix up the limited range RGB output commit.
CEA mode #1 is the only one that doesn't do limited range, thus the
strange pattern in other drivers.
Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -343,8 +343,11 @@ static void vc4_hdmi_encoder_mode_set(st
csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
VC4_HD_CSC_CTL_ORDER);
- if (vc4_encoder->hdmi_monitor && drm_match_cea_mode(mode) != 0) {
- /* Enable limited range RGB output. This matrix is:
+ if (vc4_encoder->hdmi_monitor && drm_match_cea_mode(mode) > 1) {
+ /* CEA VICs other than #1 requre limited range RGB
+ * output. Apply a colorspace conversion to squash
+ * 0-255 down to 16-235. The matrix here is:
+ *
* [ 0 0 0.8594 16]
* [ 0 0.8594 0 16]
* [ 0.8594 0 0 16]