linux-kernel - [PATCH v2 8/8] drm/meson: Output in YUV444 if sink supports it

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Message-Id: <1549022873-40549-9-git-send-email-narmstrong@baylibre.com>
Date:   Fri,  1 Feb 2019 12:07:53 +0000
From:   Neil Armstrong <narmstrong@...libre.com>
To:     a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
        p.zabel@...gutronix.de, Sandy Huang <hjc@...k-chips.com>,
        heiko@...ech.de, maxime.ripard@...tlin.com
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 8/8] drm/meson: Output in YUV444 if sink supports it

With the YUV420 handling, we can dynamically setup the HDMI output
pixel format depending on the mode and connector info.
So now, we can output in YUV444, which is the native video pipeline
format, directly to the HDMI Sink if it's supported without
necessarily involving the HDMI Controller CSC.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/meson/meson_dw_hdmi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 540971a..69f9b2a 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -664,7 +664,10 @@ static int meson_venc_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
 		dw_hdmi->output_bus_format = MEDIA_BUS_FMT_UYYVYY8_0_5X24;
 	} else {
 		dw_hdmi->input_bus_format = MEDIA_BUS_FMT_YUV8_1X24;
-		dw_hdmi->output_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
+			dw_hdmi->output_bus_format = MEDIA_BUS_FMT_YUV8_1X24;
+		else
+			dw_hdmi->output_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 	}
 
 	return 0;
-- 
2.7.4