linux-kernel - [PATCH v3 01/10] drm/bridge: dw-hdmi: set mtmdsclock for deep color

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Message-Id: <20191218154637.17509-2-narmstrong@baylibre.com>
Date:   Wed, 18 Dec 2019 16:46:28 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...l.net,
        boris.brezillon@...labora.com
Cc:     linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH v3 01/10] drm/bridge: dw-hdmi: set mtmdsclock for deep color

From: Jonas Karlman <jonas@...boo.se>

Configure the correct mtmdsclock for deep colors to prepare support
for 10, 12 & 16bit output.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index dbe38a54870b..6a0b4b3a6739 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1792,9 +1792,26 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
 
 	dev_dbg(hdmi->dev, "final pixclk = %d\n", vmode->mpixelclock);
 
+	if (!hdmi_bus_fmt_is_yuv422(hdmi->hdmi_data.enc_out_bus_format)) {
+		switch (hdmi_bus_fmt_color_depth(
+				hdmi->hdmi_data.enc_out_bus_format)) {
+		case 16:
+			vmode->mtmdsclock = (u64)vmode->mpixelclock * 2;
+			break;
+		case 12:
+			vmode->mtmdsclock = (u64)vmode->mpixelclock * 3 / 2;
+			break;
+		case 10:
+			vmode->mtmdsclock = (u64)vmode->mpixelclock * 5 / 4;
+			break;
+		}
+	}
+
 	if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format))
 		vmode->mtmdsclock /= 2;
 
+	dev_dbg(hdmi->dev, "final tmdsclk = %d\n", vmode->mtmdsclock);
+
 	/* Set up HDMI_FC_INVIDCONF */
 	inv_val = (hdmi->hdmi_data.hdcp_enable ||
 		   (dw_hdmi_support_scdc(hdmi) &&
-- 
2.22.0