[PATCH v10 18/27] drm/connector: hdmi: Add RGB Quantization Range to the connector state

Maxime Ripard
2024-03-21T15:30:18Z

HDMI controller drivers will need to figure out the RGB range they need
to configure based on a mode and property values. Let's expose that in
the HDMI connector state so drivers can just use that value.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
drivers/gpu/drm/drm_atomic.c | 1 +
drivers/gpu/drm/drm_atomic_state_helper.c | 29 +++++++++++++++++++++++++++++
include/drm/drm_connector.h | 6 ++++++
3 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 3e57d98d8418..ec6c6beda5c9 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1145,10 +1145,11 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,

if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
drm_printf(p, "\tbroadcast_rgb=%s\n",
drm_hdmi_connector_get_broadcast_rgb_name(state->hdmi.broadcast_rgb));
+ drm_printf(p, "\tis_full_range=%c\n", state->hdmi.is_full_range ? 'y' : 'n');
drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc);
drm_printf(p, "\toutput_format=%s\n",
drm_hdmi_connector_get_output_format_name(state->hdmi.output_format));
drm_printf(p, "\ttmds_char_rate=%llu\n", state->hdmi.tmds_char_rate);
}
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 2ad3cfafde27..8d436fdc5c91 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -662,10 +662,37 @@ connector_state_get_mode(const struct drm_connector_state *conn_state)
return NULL;

return &crtc_state->mode;
}

+static bool hdmi_is_full_range(const struct drm_connector *connector,
+ const struct drm_connector_state *conn_state)
+{
+ const struct drm_display_info *display = &connector->display_info;
+ const struct drm_display_mode *mode =
+ connector_state_get_mode(conn_state);
+
+ /*
+ * The Broadcast RGB property only applies to RGB format, and
+ * i915 just assumes limited range for YCbCr output, so let's
+ * just do the same.
+ */
+ if (conn_state->hdmi.output_format != HDMI_COLORSPACE_RGB)
+ return false;
+
+ if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_FULL)
+ return true;
+
+ if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED)
+ return false;
+
+ if (!display->is_hdmi)
+ return true;
+
+ return drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_FULL ? true : false;
+}
+
static bool
sink_supports_format_bpc(const struct drm_connector *connector,
const struct drm_display_info *info,
const struct drm_display_mode *mode,
unsigned int format, unsigned int bpc)
@@ -920,10 +947,12 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
drm_atomic_get_new_connector_state(state, connector);
const struct drm_display_mode *mode =
connector_state_get_mode(new_conn_state);
int ret;

+ new_conn_state->hdmi.is_full_range = hdmi_is_full_range(connector, new_conn_state);
+
ret = hdmi_compute_config(connector, new_conn_state, mode);
if (ret)
return ret;

if (old_conn_state->hdmi.broadcast_rgb != new_conn_state->hdmi.broadcast_rgb ||
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index bb6b6a36ade3..3eaf4d54364d 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1068,10 +1068,16 @@ struct drm_connector_state {
* @broadcast_rgb: Connector property to pass the
* Broadcast RGB selection value.
*/
enum drm_hdmi_broadcast_rgb broadcast_rgb;

+ /**
+ * @is_full_range: Is the output supposed to use a full
+ * RGB Quantization Range or not?
+ */
+ bool is_full_range;
+
/**
* @output_bpc: Bits per color channel to output.
*/
unsigned int output_bpc;

--
2.44.0