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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/gpu/drm/drm_simple_kms_helper.c
....@@ -1,19 +1,17 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Copyright (C) 2016 Noralf Trønnes
3
- *
4
- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
84  */
95 
10
-#include <drm/drmP.h>
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+
119 #include <drm/drm_atomic.h>
1210 #include <drm/drm_atomic_helper.h>
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-#include <drm/drm_crtc_helper.h>
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+#include <drm/drm_bridge.h>
1412 #include <drm/drm_plane_helper.h>
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+#include <drm/drm_probe_helper.h>
1514 #include <drm/drm_simple_kms_helper.h>
16
-#include <linux/slab.h>
1715 
1816 /**
1917  * DOC: overview
....@@ -28,11 +26,50 @@
2826  * entity. Some flexibility for code reuse is provided through a separately
2927  * allocated &drm_connector object and supporting optional &drm_bridge
3028  * encoder drivers.
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+ *
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+ * Many drivers require only a very simple encoder that fulfills the minimum
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+ * requirements of the display pipeline and does not add additional
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+ * functionality. The function drm_simple_encoder_init() provides an
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+ * implementation of such an encoder.
3134  */
3235 
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-static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
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+static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
3437 	.destroy = drm_encoder_cleanup,
3538 };
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+
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+/**
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+ * drm_simple_encoder_init - Initialize a preallocated encoder with
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+ *                           basic functionality.
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+ * @dev: drm device
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+ * @encoder: the encoder to initialize
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+ * @encoder_type: user visible type of the encoder
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+ *
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+ * Initialises a preallocated encoder that has no further functionality.
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+ * Settings for possible CRTC and clones are left to their initial values.
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+ * The encoder will be cleaned up automatically as part of the mode-setting
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+ * cleanup.
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+ *
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+ * The caller of drm_simple_encoder_init() is responsible for freeing
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+ * the encoder's memory after the encoder has been cleaned up. At the
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+ * moment this only works reliably if the encoder data structure is
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+ * stored in the device structure. Free the encoder's memory as part of
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+ * the device release function.
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+ *
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+ * FIXME: Later improvements to DRM's resource management may allow for
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+ *        an automated kfree() of the encoder's memory.
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+ *
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+ * Returns:
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+ * Zero on success, error code on failure.
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+ */
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+int drm_simple_encoder_init(struct drm_device *dev,
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+			    struct drm_encoder *encoder,
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+			    int encoder_type)
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+{
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+	return drm_encoder_init(dev, encoder,
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+				&drm_simple_encoder_funcs_cleanup,
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+				encoder_type, NULL);
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+}
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+EXPORT_SYMBOL(drm_simple_encoder_init);
3673 
3774 static enum drm_mode_status
3875 drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
....@@ -45,7 +82,7 @@
4582 		/* Anything goes */
4683 		return MODE_OK;
4784 
48
-	return pipe->funcs->mode_valid(crtc, mode);
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+	return pipe->funcs->mode_valid(pipe, mode);
4986 }
5087 
5188 static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
....@@ -190,6 +227,13 @@
190227 	pipe->funcs->cleanup_fb(pipe, state);
191228 }
192229 
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+static bool drm_simple_kms_format_mod_supported(struct drm_plane *plane,
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+						uint32_t format,
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+						uint64_t modifier)
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+{
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+	return modifier == DRM_FORMAT_MOD_LINEAR;
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+}
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+
193237 static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
194238 	.prepare_fb = drm_simple_kms_plane_prepare_fb,
195239 	.cleanup_fb = drm_simple_kms_plane_cleanup_fb,
....@@ -204,6 +248,7 @@
204248 	.reset			= drm_atomic_helper_plane_reset,
205249 	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
206250 	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
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+	.format_mod_supported   = drm_simple_kms_format_mod_supported,
207252 };
208253 
209254 /**
....@@ -223,7 +268,7 @@
223268 int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
224269 					  struct drm_bridge *bridge)
225270 {
226
-	return drm_bridge_attach(&pipe->encoder, bridge, NULL);
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+	return drm_bridge_attach(&pipe->encoder, bridge, NULL, 0);
227272 }
228273 EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
229274 
....@@ -282,8 +327,7 @@
282327 		return ret;
283328 
284329 	encoder->possible_crtcs = drm_crtc_mask(crtc);
285
-	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
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-			       DRM_MODE_ENCODER_NONE, NULL);
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+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
287331 	if (ret || !connector)
288332 		return ret;
289333