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From 3e7f3ec3de8753faefdeb02ed6d00cc580e6ad52 Mon Sep 17 00:00:00 2001
From: Neil Armstrong <narmstrong@baylibre.com>
Date: Wed, 14 Nov 2018 17:19:36 +0100
Subject: [PATCH] drm/bridge: dw-hdmi: add support for YUV420 output
In order to support the HDMI2.0 YUV420 display modes, this patch
adds support for the YUV420 TMDS Clock divided by 2 and the controller
passthrough mode.
This patch is based on work from Zheng Yang <zhengyang@rock-chips.com> in
the Rockchip Linux 4.4 BSP at [1]
[1] https://github.com/rockchip-linux/kernel/tree/release-4.4
Cc: Zheng Yang <zhengyang@rock-chips.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 63 ++++++++++++++++++++++++-------
1 file changed, 50 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 2a30d83..c3e4ed1 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -94,6 +94,7 @@ struct hdmi_vmode {
unsigned int mpixelclock;
unsigned int mpixelrepetitioninput;
unsigned int mpixelrepetitionoutput;
+ unsigned int mtmdsclock;
};
struct hdmi_data_info {
@@ -549,7 +550,7 @@ static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi)
static void hdmi_clk_regenerator_update_pixel_clock(struct dw_hdmi *hdmi)
{
mutex_lock(&hdmi->audio_mutex);
- hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
+ hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mtmdsclock,
hdmi->sample_rate);
mutex_unlock(&hdmi->audio_mutex);
}
@@ -558,7 +559,7 @@ void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate)
{
mutex_lock(&hdmi->audio_mutex);
hdmi->sample_rate = rate;
- hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mpixelclock,
+ hdmi_set_clk_regenerator(hdmi, hdmi->hdmi_data.video_mode.mtmdsclock,
hdmi->sample_rate);
mutex_unlock(&hdmi->audio_mutex);
}
@@ -659,6 +660,20 @@ static bool hdmi_bus_fmt_is_yuv422(unsigned int bus_format)
}
}
+static bool hdmi_bus_fmt_is_yuv420(unsigned int bus_format)
+{
+ switch (bus_format) {
+ case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
+ case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
+ case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
+ case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
static int hdmi_bus_fmt_color_depth(unsigned int bus_format)
{
switch (bus_format) {
@@ -888,7 +903,8 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
u8 val, vp_conf;
if (hdmi_bus_fmt_is_rgb(hdmi->hdmi_data.enc_out_bus_format) ||
- hdmi_bus_fmt_is_yuv444(hdmi->hdmi_data.enc_out_bus_format)) {
+ hdmi_bus_fmt_is_yuv444(hdmi->hdmi_data.enc_out_bus_format) ||
+ hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format)) {
switch (hdmi_bus_fmt_color_depth(
hdmi->hdmi_data.enc_out_bus_format)) {
case 8:
@@ -1029,7 +1045,7 @@ EXPORT_SYMBOL_GPL(dw_hdmi_phy_i2c_write);
void dw_hdmi_set_high_tmds_clock_ratio(struct dw_hdmi *hdmi)
{
- unsigned long mtmdsclock = hdmi->hdmi_data.video_mode.mpixelclock;
+ unsigned long mtmdsclock = hdmi->hdmi_data.video_mode.mtmdsclock;
/* Control for TMDS Bit Period/TMDS Clock-Period Ratio */
if (hdmi->connector.display_info.hdmi.scdc.supported) {
@@ -1370,6 +1386,9 @@ static void hdmi_config_AVI(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
struct hdmi_avi_infoframe frame;
u8 val;
+ if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format))
+ is_hdmi2_sink = true;
+
/* Initialise info frame from DRM mode */
drm_hdmi_avi_infoframe_from_display_mode(&frame, mode, is_hdmi2_sink);
@@ -1377,6 +1396,8 @@ static void hdmi_config_AVI(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
frame.colorspace = HDMI_COLORSPACE_YUV444;
else if (hdmi_bus_fmt_is_yuv422(hdmi->hdmi_data.enc_out_bus_format))
frame.colorspace = HDMI_COLORSPACE_YUV422;
+ else if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format))
+ frame.colorspace = HDMI_COLORSPACE_YUV420;
else
frame.colorspace = HDMI_COLORSPACE_RGB;
@@ -1534,15 +1555,18 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
struct drm_hdmi_info *hdmi_info = &hdmi->connector.display_info.hdmi;
struct hdmi_vmode *vmode = &hdmi->hdmi_data.video_mode;
int hblank, vblank, h_de_hs, v_de_vs, hsync_len, vsync_len;
- unsigned int vdisplay;
+ unsigned int vdisplay, hdisplay;
- vmode->mpixelclock = mode->clock * 1000;
+ vmode->mtmdsclock = vmode->mpixelclock = mode->clock * 1000;
dev_dbg(hdmi->dev, "final pixclk = %d\n", vmode->mpixelclock);
+ if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format))
+ vmode->mtmdsclock /= 2;
+
/* Set up HDMI_FC_INVIDCONF */
inv_val = (hdmi->hdmi_data.hdcp_enable ||
- vmode->mpixelclock > 340000000 ||
+ vmode->mtmdsclock > 340000000 ||
hdmi_info->scdc.scrambling.low_rates ?
HDMI_FC_INVIDCONF_HDCP_KEEPOUT_ACTIVE :
HDMI_FC_INVIDCONF_HDCP_KEEPOUT_INACTIVE);
@@ -1576,6 +1600,22 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
hdmi_writeb(hdmi, inv_val, HDMI_FC_INVIDCONF);
+ hdisplay = mode->hdisplay;
+ hblank = mode->htotal - mode->hdisplay;
+ h_de_hs = mode->hsync_start - mode->hdisplay;
+ hsync_len = mode->hsync_end - mode->hsync_start;
+
+ /*
+ * When we're setting a YCbCr420 mode, we need
+ * to adjust the horizontal timing to suit.
+ */
+ if (hdmi_bus_fmt_is_yuv420(hdmi->hdmi_data.enc_out_bus_format)) {
+ hdisplay /= 2;
+ hblank /= 2;
+ h_de_hs /= 2;
+ hsync_len /= 2;
+ }
+
vdisplay = mode->vdisplay;
vblank = mode->vtotal - mode->vdisplay;
v_de_vs = mode->vsync_start - mode->vdisplay;
@@ -1594,7 +1634,7 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
/* Scrambling Control */
if (hdmi_info->scdc.supported) {
- if (vmode->mpixelclock > 340000000 ||
+ if (vmode->mtmdsclock > 340000000 ||
hdmi_info->scdc.scrambling.low_rates) {
drm_scdc_readb(&hdmi->i2c->adap, SCDC_SINK_VERSION,
&bytes);
@@ -1613,15 +1653,14 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
}
/* Set up horizontal active pixel width */
- hdmi_writeb(hdmi, mode->hdisplay >> 8, HDMI_FC_INHACTV1);
- hdmi_writeb(hdmi, mode->hdisplay, HDMI_FC_INHACTV0);
+ hdmi_writeb(hdmi, hdisplay >> 8, HDMI_FC_INHACTV1);
+ hdmi_writeb(hdmi, hdisplay, HDMI_FC_INHACTV0);
/* Set up vertical active lines */
hdmi_writeb(hdmi, vdisplay >> 8, HDMI_FC_INVACTV1);
hdmi_writeb(hdmi, vdisplay, HDMI_FC_INVACTV0);
/* Set up horizontal blanking pixel region width */
- hblank = mode->htotal - mode->hdisplay;
hdmi_writeb(hdmi, hblank >> 8, HDMI_FC_INHBLANK1);
hdmi_writeb(hdmi, hblank, HDMI_FC_INHBLANK0);
@@ -1629,7 +1668,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
hdmi_writeb(hdmi, vblank, HDMI_FC_INVBLANK);
/* Set up HSYNC active edge delay width (in pixel clks) */
- h_de_hs = mode->hsync_start - mode->hdisplay;
hdmi_writeb(hdmi, h_de_hs >> 8, HDMI_FC_HSYNCINDELAY1);
hdmi_writeb(hdmi, h_de_hs, HDMI_FC_HSYNCINDELAY0);
@@ -1637,7 +1675,6 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi,
hdmi_writeb(hdmi, v_de_vs, HDMI_FC_VSYNCINDELAY);
/* Set up HSYNC active pulse width (in pixel clks) */
- hsync_len = mode->hsync_end - mode->hsync_start;
hdmi_writeb(hdmi, hsync_len >> 8, HDMI_FC_HSYNCINWIDTH1);
hdmi_writeb(hdmi, hsync_len, HDMI_FC_HSYNCINWIDTH0);
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