linux-kernel - [PATCH 4/4] drm/i915/display: Add handling for new "active bpc" property

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Message-Id: <20210604171723.10276-5-wse@tuxedocomputers.com>
Date:   Fri,  4 Jun 2021 19:17:23 +0200
From:   Werner Sembach <wse@...edocomputers.com>
To:     harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Cc:     Werner Sembach <wse@...edocomputers.com>
Subject: [PATCH 4/4] drm/i915/display: Add handling for new "active bpc" property

This commits implements the "active bpc" drm property for the Intel GPU driver.

Signed-off-by: Werner Sembach <wse@...edocomputers.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 13 +++++++++++++
 drivers/gpu/drm/i915/display/intel_dp.c      |  8 ++++++--
 drivers/gpu/drm/i915/display/intel_dp_mst.c  |  4 +++-
 drivers/gpu/drm/i915/display/intel_hdmi.c    |  4 +++-
 4 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 64e9107d70f7..f7898d9d7438 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -10164,6 +10164,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc_state *new_crtc_state, *old_crtc_state;
 	struct intel_crtc *crtc;
+	struct drm_connector *connector;
+	struct drm_connector_state *new_conn_state;
 	u64 put_domains[I915_MAX_PIPES] = {};
 	intel_wakeref_t wakeref = 0;
 	int i;
@@ -10324,6 +10326,17 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	}
 	intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
 
+	/* Extract information from crtc to communicate it to userspace as connector properties */
+	for_each_new_connector_in_state(&state->base, connector, new_conn_state, i) {
+		struct drm_crtc *crtc = new_conn_state->crtc;
+		if (crtc) {
+			new_crtc_state = to_intel_crtc_state(drm_atomic_get_new_crtc_state(&state->base, crtc));
+			new_conn_state->active_bpc = new_crtc_state->pipe_bpp / 3;
+		}
+		else
+			new_conn_state->active_bpc = 0;
+	}
+
 	/*
 	 * Defer the cleanup of the old state to a separate worker to not
 	 * impede the current task (userspace for blocking modesets) that
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 642c60f3d9b1..67826ba976ed 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4671,10 +4671,14 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
 		intel_attach_force_audio_property(connector);
 
 	intel_attach_broadcast_rgb_property(connector);
-	if (HAS_GMCH(dev_priv))
+	if (HAS_GMCH(dev_priv)) {
 		drm_connector_attach_max_bpc_property(connector, 6, 10);
-	else if (DISPLAY_VER(dev_priv) >= 5)
+		drm_connector_attach_active_bpc_property(connector, 6, 10);
+	}
+	else if (DISPLAY_VER(dev_priv) >= 5) {
 		drm_connector_attach_max_bpc_property(connector, 6, 12);
+		drm_connector_attach_active_bpc_property(connector, 6, 12);
+	}
 
 	/* Register HDMI colorspace for case of lspcon */
 	if (intel_bios_is_lspcon_present(dev_priv, port)) {
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 2daa3f67791e..5a1869dc2210 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -844,8 +844,10 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
 	 */
 	connector->max_bpc_property =
 		intel_dp->attached_connector->base.max_bpc_property;
-	if (connector->max_bpc_property)
+	if (connector->max_bpc_property) {
 		drm_connector_attach_max_bpc_property(connector, 6, 12);
+		drm_connector_attach_active_bpc_property(connector, 6, 12);
+	}
 
 	return connector;
 
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index d69f0a6dc26d..8af78b27b6ce 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2463,8 +2463,10 @@ intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *c
 		drm_object_attach_property(&connector->base,
 			connector->dev->mode_config.hdr_output_metadata_property, 0);
 
-	if (!HAS_GMCH(dev_priv))
+	if (!HAS_GMCH(dev_priv)) {
 		drm_connector_attach_max_bpc_property(connector, 8, 12);
+		drm_connector_attach_active_bpc_property(connector, 8, 12);
+	}
 }
 
 /*
-- 
2.25.1