1 /* SPDX-License-Identifier: GPL-2.0 */
3 * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
4 * Author: Brian Starkey <brian.starkey@arm.com>
6 * This program is free software and is provided to you under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation, and any use by you of this program is subject to the terms
12 #ifndef __DRM_WRITEBACK_H__
13 #define __DRM_WRITEBACK_H__
14 #include <drm/drm_connector.h>
15 #include <drm/drm_encoder.h>
16 #include <linux/workqueue.h>
19 * struct drm_writeback_connector - DRM writeback connector
21 struct drm_writeback_connector
{
23 * @base: base drm_connector object
25 struct drm_connector base
;
28 * @encoder: Internal encoder used by the connector to fulfill
29 * the DRM framework requirements. The users of the
30 * @drm_writeback_connector control the behaviour of the @encoder
31 * by passing the @enc_funcs parameter to drm_writeback_connector_init()
34 struct drm_encoder encoder
;
37 * @pixel_formats_blob_ptr:
39 * DRM blob property data for the pixel formats list on writeback
41 * See also drm_writeback_connector_init()
43 struct drm_property_blob
*pixel_formats_blob_ptr
;
45 /** @job_lock: Protects job_queue */
51 * Holds a list of a connector's writeback jobs; the last item is the
52 * most recent. The first item may be either waiting for the hardware
53 * to begin writing, or currently being written.
55 * See also: drm_writeback_queue_job() and
56 * drm_writeback_signal_completion()
58 struct list_head job_queue
;
63 * timeline context used for fence operations.
65 unsigned int fence_context
;
69 * spinlock to protect the fences in the fence_context.
71 spinlock_t fence_lock
;
75 * Seqno variable used as monotonic counter for the fences
76 * created on the connector's timeline.
78 unsigned long fence_seqno
;
82 * The name of the connector's fence timeline.
84 char timeline_name
[32];
88 * struct drm_writeback_job - DRM writeback job
90 struct drm_writeback_job
{
94 * Back-pointer to the writeback connector associated with the job
96 struct drm_writeback_connector
*connector
;
101 * Set when the job has been prepared with drm_writeback_prepare_job()
108 * Used to allow drm_writeback_signal_completion to defer dropping the
109 * framebuffer reference to a workqueue
111 struct work_struct cleanup_work
;
116 * List item for the writeback connector's @job_queue
118 struct list_head list_entry
;
123 * Framebuffer to be written to by the writeback connector. Do not set
124 * directly, use drm_writeback_set_fb()
126 struct drm_framebuffer
*fb
;
131 * Fence which will signal once the writeback has completed
133 struct dma_fence
*out_fence
;
138 * Driver-private data
143 static inline struct drm_writeback_connector
*
144 drm_connector_to_writeback(struct drm_connector
*connector
)
146 return container_of(connector
, struct drm_writeback_connector
, base
);
149 int drm_writeback_connector_init(struct drm_device
*dev
,
150 struct drm_writeback_connector
*wb_connector
,
151 const struct drm_connector_funcs
*con_funcs
,
152 const struct drm_encoder_helper_funcs
*enc_helper_funcs
,
153 const u32
*formats
, int n_formats
);
155 int drm_writeback_set_fb(struct drm_connector_state
*conn_state
,
156 struct drm_framebuffer
*fb
);
158 int drm_writeback_prepare_job(struct drm_writeback_job
*job
);
160 void drm_writeback_queue_job(struct drm_writeback_connector
*wb_connector
,
161 struct drm_connector_state
*conn_state
);
163 void drm_writeback_cleanup_job(struct drm_writeback_job
*job
);
166 drm_writeback_signal_completion(struct drm_writeback_connector
*wb_connector
,
170 drm_writeback_get_out_fence(struct drm_writeback_connector
*wb_connector
);