linux-kernel - [PATCH RFC v3 02/37] drm/connector: hdmi: Create a custom state

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Message-Id: <20231031-kms-hdmi-connector-state-v3-2-328b0fae43a7@kernel.org>
Date:   Tue, 31 Oct 2023 17:48:15 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        Jonathan Corbet <corbet@....net>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH RFC v3 02/37] drm/connector: hdmi: Create a custom state

The next features we will need to share across drivers will need to
store some parameters for drivers to use, such as the selected output
format.

Let's create a new connector state dedicated to HDMI controllers, that
will eventually store everything we need.

Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/drm_atomic_state_helper.c | 35 +++++++++++++++++++++++++++++++
 include/drm/drm_atomic_state_helper.h     |  4 ++++
 include/drm/drm_connector.h               |  3 +++
 3 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 784e63d70a42..29cb64e9cf28 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -556,6 +556,22 @@ void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 
+/**
+ * __drm_atomic_helper_connector_hdmi_reset() - Initializes all HDMI @drm_connector_state resources
+ * @connector: DRM connector
+ * @new_state: connector state to reset
+ *
+ * Initializes all HDMI resources from a @drm_connector_state without
+ * actually allocating it. This is useful for HDMI drivers, in
+ * combination with __drm_atomic_helper_connector_reset() or
+ * drm_atomic_helper_connector_reset().
+ */
+void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
+					      struct drm_connector_state *new_state)
+{
+}
+EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);
+
 /**
  * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
  * @connector: DRM Connector
@@ -605,6 +621,25 @@ int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 }
 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_check);
 
+/**
+ * drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state
+ * @connector: DRM Connector
+ * @state: the DRM State object
+ *
+ * Provides a default connector state check handler for HDMI connectors.
+ * Checks that a desired connector update is valid, and updates various
+ * fields of derived state.
+ *
+ * RETURNS:
+ * Zero on success, or an errno code otherwise.
+ */
+int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
+					   struct drm_atomic_state *state)
+{
+	return 0;
+}
+EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
+
 /**
  * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
  * @connector: connector object
diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
index b9740edb2658..d59d2b3aef9a 100644
--- a/include/drm/drm_atomic_state_helper.h
+++ b/include/drm/drm_atomic_state_helper.h
@@ -71,7 +71,11 @@ void __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_
 void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
 					 struct drm_connector_state *conn_state);
 void drm_atomic_helper_connector_reset(struct drm_connector *connector);
+void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
+					      struct drm_connector_state *new_state);
 void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector);
+int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
+					   struct drm_atomic_state *state);
 int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 					 struct drm_atomic_state *state);
 void drm_atomic_helper_connector_tv_margins_reset(struct drm_connector *connector);
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index c86cd363d652..5961f2ad48b1 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1022,6 +1022,9 @@ struct drm_connector_state {
 	 * DRM blob property for HDR output metadata
 	 */
 	struct drm_property_blob *hdr_output_metadata;
+
+	struct {
+	} hdmi;
 };
 
 /**

-- 
2.41.0