[PATCH v10 04/27] drm/connector: hdmi: Add output BPC to the connector state

Maxime Ripard
2024-03-21T15:29:38Z

We'll add automatic selection of the output BPC in a following patch,
but let's add it to the HDMI connector state already.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
drivers/gpu/drm/drm_atomic.c | 5 +++++
drivers/gpu/drm/drm_atomic_state_helper.c | 20 ++++++++++++++++++++
drivers/gpu/drm/drm_connector.c | 20 +++++++++++++++++++-
drivers/gpu/drm/tests/drm_connector_test.c | 12 ++++++++----
include/drm/drm_connector.h | 12 +++++++++++-
5 files changed, 63 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index a91737adf8e7..4e11cfb4518b 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1141,10 +1141,15 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
drm_printf(p, "\tmax_requested_bpc=%d\n", state->max_requested_bpc);
drm_printf(p, "\tcolorspace=%s\n", drm_get_colorspace_name(state->colorspace));

+ if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
+ connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
+ drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc);
+ }
+
if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
if (state->writeback_job && state->writeback_job->fb)
drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);

if (connector->funcs->atomic_print_state)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 8f459aaa8ef4..c56ca1b08228 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -582,10 +582,14 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
* drm_atomic_helper_connector_reset().
*/
void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
struct drm_connector_state *new_conn_state)
{
+ unsigned int max_bpc = connector->max_bpc;
+
+ new_conn_state->max_bpc = max_bpc;
+ new_conn_state->max_requested_bpc = max_bpc;
}
EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);

/**
* drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
@@ -649,10 +653,26 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
* Zero on success, or an errno code otherwise.
*/
int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
struct drm_atomic_state *state)
{
+ struct drm_connector_state *old_conn_state =
+ drm_atomic_get_old_connector_state(state, connector);
+ struct drm_connector_state *new_conn_state =
+ drm_atomic_get_new_connector_state(state, connector);
+
+ if (old_conn_state->hdmi.output_bpc != new_conn_state->hdmi.output_bpc) {
+ struct drm_crtc *crtc = new_conn_state->crtc;
+ struct drm_crtc_state *crtc_state;
+
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+
+ crtc_state->mode_changed = true;
+ }
+
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);

/**
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index d9961cce8245..da51a2bcb978 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -457,10 +457,11 @@ EXPORT_SYMBOL(drmm_connector_init);
* @dev: DRM device
* @connector: A pointer to the HDMI connector to init
* @funcs: callbacks for this connector
* @connector_type: user visible type of the connector
* @ddc: optional pointer to the associated ddc adapter
+ * @max_bpc: Maximum bits per char the HDMI connector supports
*
* Initialises a preallocated HDMI connector. Connectors can be
* subclassed as part of driver connector objects.
*
* Cleanup is automatically handled with a call to
@@ -473,22 +474,39 @@ EXPORT_SYMBOL(drmm_connector_init);
*/
int drmm_connector_hdmi_init(struct drm_device *dev,
struct drm_connector *connector,
const struct drm_connector_funcs *funcs,
int connector_type,
- struct i2c_adapter *ddc)
+ struct i2c_adapter *ddc,
+ unsigned int max_bpc)
{
int ret;

if (!(connector_type == DRM_MODE_CONNECTOR_HDMIA ||
connector_type == DRM_MODE_CONNECTOR_HDMIB))
return -EINVAL;

+ if (!(max_bpc == 8 || max_bpc == 10 || max_bpc == 12))
+ return -EINVAL;
+
ret = drmm_connector_init(dev, connector, funcs, connector_type, ddc);
if (ret)
return ret;

+ /*
+ * drm_connector_attach_max_bpc_property() requires the
+ * connector to have a state.
+ */
+ if (connector->funcs->reset)
+ connector->funcs->reset(connector);
+
+ drm_connector_attach_max_bpc_property(connector, 8, max_bpc);
+ connector->max_bpc = max_bpc;
+
+ if (max_bpc > 8)
+ drm_connector_attach_hdr_output_metadata_property(connector);
+
return 0;
}
EXPORT_SYMBOL(drmm_connector_hdmi_init);

/**
diff --git a/drivers/gpu/drm/tests/drm_connector_test.c b/drivers/gpu/drm/tests/drm_connector_test.c
index 261d4109946d..2661eb64a5cd 100644
--- a/drivers/gpu/drm/tests/drm_connector_test.c
+++ b/drivers/gpu/drm/tests/drm_connector_test.c
@@ -182,11 +182,12 @@ static void drm_test_connector_hdmi_init_valid(struct kunit *test)
int ret;

ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
&dummy_funcs,
DRM_MODE_CONNECTOR_HDMIA,
- &priv->ddc);
+ &priv->ddc,
+ 8);
KUNIT_EXPECT_EQ(test, ret, 0);
}

/*
* Test that the registration of a connector without a DDC adapter
@@ -198,11 +199,12 @@ static void drm_test_connector_hdmi_init_null_ddc(struct kunit *test)
int ret;

ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
&dummy_funcs,
DRM_MODE_CONNECTOR_HDMIA,
- NULL);
+ NULL,
+ 8);
KUNIT_EXPECT_EQ(test, ret, 0);
}

/*
* Test that the registration of an HDMI connector with an HDMI
@@ -215,11 +217,12 @@ static void drm_test_connector_hdmi_init_type_valid(struct kunit *test)
int ret;

ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
&dummy_funcs,
connector_type,
- &priv->ddc);
+ &priv->ddc,
+ 8);
KUNIT_EXPECT_EQ(test, ret, 0);
}

static const unsigned int drm_connector_hdmi_init_type_valid_tests[] = {
DRM_MODE_CONNECTOR_HDMIA,
@@ -246,11 +249,12 @@ static void drm_test_connector_hdmi_init_type_invalid(struct kunit *test)
int ret;

ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
&dummy_funcs,
connector_type,
- &priv->ddc);
+ &priv->ddc,
+ 8);
KUNIT_EXPECT_LT(test, ret, 0);
}

static const unsigned int drm_connector_hdmi_init_type_invalid_tests[] = {
DRM_MODE_CONNECTOR_Unknown,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 000a2a156619..d4d2ae15bc1e 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1035,10 +1035,14 @@ struct drm_connector_state {
/**
* @hdmi: HDMI-related variable and properties. Filled by
* @drm_atomic_helper_connector_hdmi_check().
*/
struct {
+ /**
+ * @output_bpc: Bits per color channel to output.
+ */
+ unsigned int output_bpc;
} hdmi;
};

/**
* struct drm_connector_funcs - control connectors on a given device
@@ -1680,10 +1684,15 @@ struct drm_connector {
* DRM blob property data for the DP MST path property. This should only
* be updated by calling drm_connector_set_path_property().
*/
struct drm_property_blob *path_blob_ptr;

+ /**
+ * @max_bpc: Maximum bits per color channel the connector supports.
+ */
+ unsigned int max_bpc;
+
/**
* @max_bpc_property: Default connector property for the max bpc to be
* driven out of the connector.
*/
struct drm_property *max_bpc_property;
@@ -1913,11 +1922,12 @@ int drmm_connector_init(struct drm_device *dev,
struct i2c_adapter *ddc);
int drmm_connector_hdmi_init(struct drm_device *dev,
struct drm_connector *connector,
const struct drm_connector_funcs *funcs,
int connector_type,
- struct i2c_adapter *ddc);
+ struct i2c_adapter *ddc,
+ unsigned int max_bpc);
void drm_connector_attach_edid_property(struct drm_connector *connector);
int drm_connector_register(struct drm_connector *connector);
void drm_connector_unregister(struct drm_connector *connector);
int drm_connector_attach_encoder(struct drm_connector *connector,
struct drm_encoder *encoder);

--
2.44.0