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Message-Id: <20250902-drm-state-readout-v1-15-14ad5315da3f@kernel.org>
Date: Tue, 02 Sep 2025 10:32:43 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
Jyri Sarha <jyri.sarha@....fi>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Devarsh Thakkar <devarsht@...com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 15/29] drm/atomic_state_helper: Provide
atomic_compare_state helpers
Now that we have introduced some new infrastructure to compare state
instances, let's provide helpers for the default states.
Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
drivers/gpu/drm/drm_atomic_state_helper.c | 213 ++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_bridge.c | 16 +++
include/drm/drm_atomic_state_helper.h | 19 +++
3 files changed, 248 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 78556e0c08d2fa84b16d70243ddd21617a322014..289a8434db5e973825f8ba4616d6d8f00c8f8b0e 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -233,10 +233,48 @@ void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
__drm_atomic_helper_crtc_destroy_state(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
+/**
+ * drm_atomic_helper_crtc_compare_state - default &drm_crtc_funcs.atomic_compare_state hook for crtcs
+ * @crtc: the &struct drm_crtc instance
+ * @p: the &struct drm_printer to use
+ * @expected: Expected &struct drm_crtc_state value
+ * @actual: Actual &struct drm_crtc_state value
+ *
+ * Compares @actual to @expected and returns true if they are equal.
+ */
+bool drm_atomic_helper_crtc_compare_state(struct drm_crtc *crtc,
+ struct drm_printer *p,
+ struct drm_crtc_state *expected,
+ struct drm_crtc_state *actual)
+{
+ bool ret = true;
+
+ STATE_CHECK_PTR(ret, p, crtc->name, expected, actual, crtc);
+ STATE_CHECK_BOOL(ret, p, crtc->name, expected, actual, enable);
+ STATE_CHECK_BOOL(ret, p, crtc->name, expected, actual, active);
+ STATE_CHECK_BOOL(ret, p, crtc->name, expected, actual, no_vblank);
+ STATE_CHECK_U32(ret, p, crtc->name, expected, actual, plane_mask);
+ STATE_CHECK_U32(ret, p, crtc->name, expected, actual, connector_mask);
+ STATE_CHECK_U32(ret, p, crtc->name, expected, actual, encoder_mask);
+
+ STATE_CHECK_DISPLAY_MODE(ret, p, crtc->name, expected, actual, mode);
+ STATE_CHECK_DISPLAY_MODE(ret, p, crtc->name, expected, actual, adjusted_mode);
+ STATE_CHECK_PROPERTY_BLOB(ret, p, crtc->name, expected, actual, mode_blob);
+ STATE_CHECK_PROPERTY_BLOB(ret, p, crtc->name, expected, actual, degamma_lut);
+ STATE_CHECK_PROPERTY_BLOB(ret, p, crtc->name, expected, actual, ctm);
+ STATE_CHECK_PROPERTY_BLOB(ret, p, crtc->name, expected, actual, gamma_lut);
+ STATE_CHECK_BOOL(ret, p, crtc->name, expected, actual, vrr_enabled);
+ STATE_CHECK_BOOL(ret, p, crtc->name, expected, actual, self_refresh_active);
+ STATE_CHECK_U32(ret, p, crtc->name, expected, actual, scaling_filter);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_crtc_compare_state);
+
/**
* __drm_atomic_helper_plane_state_reset - resets plane state to default values
* @plane_state: atomic plane state, must not be NULL
* @plane: plane object, must not be NULL
*
@@ -417,10 +455,100 @@ void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
__drm_atomic_helper_plane_destroy_state(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
+static bool drm_atomic_helper_fb_compare(struct drm_printer *p,
+ struct drm_framebuffer *expected,
+ struct drm_framebuffer *actual)
+{
+ unsigned int i;
+ bool ret = true;
+
+ STATE_CHECK_FORMAT_INFO(ret, p, "framebuffer", expected, actual, format);
+
+ for (i = 0; i < expected->format->num_planes; i++) {
+ STATE_CHECK_U32(ret, p, "framebuffer", expected, actual, pitches[i]);
+ STATE_CHECK_U32(ret, p, "framebuffer", expected, actual, offsets[i]);
+ }
+
+ STATE_CHECK_U64(ret, p, "framebuffer", expected, actual, modifier);
+ STATE_CHECK_U32(ret, p, "framebuffer", expected, actual, width);
+ STATE_CHECK_U32(ret, p, "framebuffer", expected, actual, height);
+ STATE_CHECK_S32_X(ret, p, "framebuffer", expected, actual, flags);
+
+ return ret;
+}
+
+/**
+ * drm_atomic_helper_plane_compare_state - default &drm_plane_funcs.atomic_compare_state hook for planes
+ * @plane: drm plane
+ * @p: the &drm_printer to use
+ * @expected: Expected &struct drm_plane_state value
+ * @actual: Actual &struct drm_plane_state value
+ *
+ * Compares @actual to @expected and returns true if they are equal.
+ */
+bool drm_atomic_helper_plane_compare_state(struct drm_plane *plane,
+ struct drm_printer *p,
+ struct drm_plane_state *expected,
+ struct drm_plane_state *actual)
+{
+ bool ret = true;
+
+ STATE_CHECK_PTR(ret, p, plane->name, expected, actual, plane);
+ STATE_CHECK_PTR(ret, p, plane->name, expected, actual, crtc);
+
+ if (expected->fb && actual->fb) {
+ if (!drm_atomic_helper_fb_compare(p, expected->fb, actual->fb))
+ ret = false;
+ } else if (!(!expected->fb && !actual->fb)) {
+ drm_atomic_helper_print_state_mismatch(p,
+ plane->name,
+ "fb",
+ "expected framebuffer is %s, got %s",
+ expected->fb ? "non-NULL" : "NULL",
+ actual->fb ? "non-NULL" : "NULL");
+ ret = false;
+ }
+
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, crtc_x);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, crtc_y);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, crtc_w);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, crtc_h);
+ STATE_CHECK_U32_16_16(ret, p, plane->name, expected, actual, src_x);
+ STATE_CHECK_U32_16_16(ret, p, plane->name, expected, actual, src_y);
+ STATE_CHECK_U32_16_16(ret, p, plane->name, expected, actual, src_w);
+ STATE_CHECK_U32_16_16(ret, p, plane->name, expected, actual, src_h);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, hotspot_x);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, hotspot_y);
+ STATE_CHECK_U16(ret, p, plane->name, expected, actual, alpha);
+ STATE_CHECK_U16(ret, p, plane->name, expected, actual, pixel_blend_mode);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, rotation);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, zpos);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, normalized_zpos);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, color_encoding);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, color_range);
+
+ // TODO: damage clips
+
+ STATE_CHECK_BOOL(ret, p, plane->name, expected, actual, ignore_damage_clips);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, src.x1);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, src.x2);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, src.y1);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, src.y2);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, dst.x1);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, dst.x2);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, dst.y1);
+ STATE_CHECK_S32(ret, p, plane->name, expected, actual, dst.y2);
+ STATE_CHECK_BOOL(ret, p, plane->name, expected, actual, visible);
+ STATE_CHECK_U32(ret, p, plane->name, expected, actual, scaling_filter);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_plane_compare_state);
+
/**
* __drm_atomic_helper_connector_state_reset - reset the connector state
* @conn_state: atomic connector state, must not be NULL
* @connector: connectotr object, must not be NULL
*
@@ -707,10 +835,69 @@ void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
__drm_atomic_helper_connector_destroy_state(state);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
+/**
+ * drm_atomic_helper_connector_compare_state - default &drm_connector_funcs.atomic_compare_state hook for connectors
+ * @connector: the &struct drm_connector instance
+ * @p: the &struct drm_printer to use
+ * @expected: Expected &struct drm_connector_state value
+ * @actual: Actual &struct drm_connector_state value
+ *
+ * Compares @actual to @expected and returns true if they are equal.
+ */
+bool drm_atomic_helper_connector_compare_state(struct drm_connector *conn,
+ struct drm_printer *p,
+ struct drm_connector_state *expected,
+ struct drm_connector_state *actual)
+{
+ bool ret = true;
+
+ STATE_CHECK_PTR(ret, p, conn->name, expected, actual, connector);
+ STATE_CHECK_PTR(ret, p, conn->name, expected, actual, crtc);
+ STATE_CHECK_PTR(ret, p, conn->name, expected, actual, best_encoder);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, link_status);
+
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, tv.select_subconnector);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, tv.subconnector);
+
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, self_refresh_aware);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, picture_aspect_ratio);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, content_type);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, hdcp_content_type);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, scaling_mode);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, content_protection);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, colorspace);
+
+ /*
+ * NOTE: We can't check max_bpc and max_requested_bpc because it
+ * will typically come from userspace and we can't read it out
+ * from the hardware.
+ */
+
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, privacy_screen_sw_state);
+ STATE_CHECK_PROPERTY_BLOB(ret, p, conn->name, expected, actual, hdr_output_metadata);
+
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, hdmi.broadcast_rgb);
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, hdmi.infoframes.avi.set);
+ STATE_CHECK_INFOFRAME(ret, p, conn->name, expected, actual, hdmi.infoframes.avi.data);
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, hdmi.infoframes.hdr_drm.set);
+ STATE_CHECK_INFOFRAME(ret, p, conn->name, expected, actual, hdmi.infoframes.hdr_drm.data);
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, hdmi.infoframes.spd.set);
+ STATE_CHECK_INFOFRAME(ret, p, conn->name, expected, actual, hdmi.infoframes.spd.data);
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, hdmi.infoframes.hdmi.set);
+ STATE_CHECK_INFOFRAME(ret, p, conn->name, expected, actual, hdmi.infoframes.hdmi.data);
+ STATE_CHECK_BOOL(ret, p, conn->name, expected, actual, hdmi.is_limited_range);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, hdmi.output_bpc);
+ STATE_CHECK_U32(ret, p, conn->name, expected, actual, hdmi.output_format);
+ STATE_CHECK_U64(ret, p, conn->name, expected, actual, hdmi.tmds_char_rate);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_connector_compare_state);
+
static void __drm_atomic_helper_private_obj_reset(struct drm_private_obj *obj,
struct drm_private_state *state)
{
memset(state, 0, sizeof(*state));
state->obj = obj;
@@ -831,10 +1018,36 @@ drm_atomic_helper_bridge_reset(struct drm_bridge *bridge)
__drm_atomic_helper_bridge_reset(bridge, bridge_state);
return bridge_state;
}
EXPORT_SYMBOL(drm_atomic_helper_bridge_reset);
+/**
+ * drm_atomic_helper_bridge_compare_state - default &drm_bridge_funcs.atomic_compare_state hook for bridges
+ * @bridge: the &struct drm_bridge instance
+ * @p: the &struct drm_printer to use
+ * @expected: Expected &struct drm_bridge_state value
+ * @actual: Actual &struct drm_bridge_state value
+ *
+ * Compares @actual to @expected and returns true if they are equal.
+ */
+bool drm_atomic_helper_bridge_compare_state(struct drm_bridge *bridge,
+ struct drm_printer *p,
+ struct drm_bridge_state *expected,
+ struct drm_bridge_state *actual)
+{
+ bool ret = true;
+
+ STATE_CHECK_PTR(ret, p, "bridge", expected, actual, bridge);
+ STATE_CHECK_U32_X(ret, p, "bridge", expected, actual, input_bus_cfg.format);
+ STATE_CHECK_U32_X(ret, p, "bridge", expected, actual, input_bus_cfg.flags);
+ STATE_CHECK_U32_X(ret, p, "bridge", expected, actual, output_bus_cfg.format);
+ STATE_CHECK_U32_X(ret, p, "bridge", expected, actual, output_bus_cfg.flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(drm_atomic_helper_bridge_compare_state);
+
void __printf(4, 5)
drm_atomic_helper_print_state_mismatch(struct drm_printer *p,
const char *name,
const char *field,
const char *format, ...)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index e803dfd8fd5aae9c16931445213df04d8715b9f6..5fe5b75773449aeeda2d723c039126106c8d5001 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -350,10 +350,25 @@ void drm_bridge_remove(struct drm_bridge *bridge)
drm_bridge_put(bridge);
}
EXPORT_SYMBOL(drm_bridge_remove);
+static bool drm_bridge_atomic_compare_priv_state(struct drm_private_obj *obj,
+ struct drm_printer *p,
+ struct drm_private_state *a,
+ struct drm_private_state *b)
+{
+ struct drm_bridge *bridge = drm_priv_to_bridge(obj);
+ struct drm_bridge_state *state_a = drm_priv_to_bridge_state(a);
+ struct drm_bridge_state *state_b = drm_priv_to_bridge_state(b);
+
+ if (bridge->funcs->atomic_compare_state)
+ return bridge->funcs->atomic_compare_state(bridge, p, state_a, state_b);
+ else
+ return false;
+}
+
static struct drm_private_state *
drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj)
{
struct drm_bridge *bridge = drm_priv_to_bridge(obj);
struct drm_bridge_state *state;
@@ -388,10 +403,11 @@ drm_bridge_atomic_print_priv_state(struct drm_printer *p,
drm_printf(p, "\t\tcode: %04x", state->output_bus_cfg.format);
drm_printf(p, "\t\tflags: %08x", state->output_bus_cfg.flags);
}
static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = {
+ .atomic_compare_state = drm_bridge_atomic_compare_priv_state,
.atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state,
.atomic_destroy_state = drm_bridge_atomic_destroy_priv_state,
.atomic_print_state = drm_bridge_atomic_print_priv_state,
};
diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
index 3c6ffa7122cf895f1eda09ec74c6537594d4aee3..7542b1679a623ddd8bb5ed12e770832f3ccf16ee 100644
--- a/include/drm/drm_atomic_state_helper.h
+++ b/include/drm/drm_atomic_state_helper.h
@@ -35,10 +35,11 @@ struct drm_crtc_state;
struct drm_plane;
struct drm_plane_state;
struct drm_printer;
struct drm_connector;
struct drm_connector_state;
+struct drm_printer;
struct drm_private_obj;
struct drm_private_state;
struct drm_modeset_acquire_ctx;
struct drm_device;
@@ -52,10 +53,14 @@ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
struct drm_crtc_state *
drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc);
void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state);
void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
struct drm_crtc_state *state);
+bool drm_atomic_helper_crtc_compare_state(struct drm_crtc *crtc,
+ struct drm_printer *p,
+ struct drm_crtc_state *expected,
+ struct drm_crtc_state *actual);
void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *state,
struct drm_plane *plane);
void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
struct drm_plane_state *state);
@@ -65,10 +70,14 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
struct drm_plane_state *
drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane);
void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state);
void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
struct drm_plane_state *state);
+bool drm_atomic_helper_plane_compare_state(struct drm_plane *plane,
+ struct drm_printer *p,
+ struct drm_plane_state *expected,
+ struct drm_plane_state *actual);
void __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
struct drm_connector *connector);
void __drm_atomic_helper_connector_reset(struct drm_connector *connector,
struct drm_connector_state *conn_state);
@@ -78,10 +87,15 @@ 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);
void
__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
struct drm_connector_state *state);
+bool drm_atomic_helper_connector_compare_state(struct drm_connector *connector,
+ struct drm_printer *p,
+ struct drm_connector_state *expected,
+ struct drm_connector_state *actual);
+
struct drm_connector_state *
drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
void
__drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
@@ -98,10 +112,15 @@ void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge,
void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge,
struct drm_bridge_state *state);
struct drm_bridge_state *
drm_atomic_helper_bridge_reset(struct drm_bridge *bridge);
+bool drm_atomic_helper_bridge_compare_state(struct drm_bridge *bridge,
+ struct drm_printer *p,
+ struct drm_bridge_state *expected,
+ struct drm_bridge_state *actual);
+
void __printf(4, 5)
drm_atomic_helper_print_state_mismatch(struct drm_printer *p,
const char *name,
const char *field,
const char *format, ...);
--
2.50.1
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