1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
4  */
5 
6 #include <drm/drm_edid.h>
7 
8 #include "dpu_writeback.h"
9 
10 static int dpu_wb_conn_get_modes(struct drm_connector *connector)
11 {
12 	struct drm_device *dev = connector->dev;
13 	struct msm_drm_private *priv = dev->dev_private;
14 	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
15 
16 	/*
17 	 * We should ideally be limiting the modes only to the maxlinewidth but
18 	 * on some chipsets this will allow even 4k modes to be added which will
19 	 * fail the per SSPP bandwidth checks. So, till we have dual-SSPP support
20 	 * and source split support added lets limit the modes based on max_mixer_width
21 	 * as 4K modes can then be supported.
22 	 */
23 	return drm_add_modes_noedid(connector, dpu_kms->catalog->caps->max_mixer_width,
24 			dev->mode_config.max_height);
25 }
26 
27 static const struct drm_connector_funcs dpu_wb_conn_funcs = {
28 	.reset = drm_atomic_helper_connector_reset,
29 	.fill_modes = drm_helper_probe_single_connector_modes,
30 	.destroy = drm_connector_cleanup,
31 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
32 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
33 };
34 
35 static int dpu_wb_conn_prepare_job(struct drm_writeback_connector *connector,
36 		struct drm_writeback_job *job)
37 {
38 
39 	struct dpu_wb_connector *dpu_wb_conn = to_dpu_wb_conn(connector);
40 
41 	if (!job->fb)
42 		return 0;
43 
44 	dpu_encoder_prepare_wb_job(dpu_wb_conn->wb_enc, job);
45 
46 	return 0;
47 }
48 
49 static void dpu_wb_conn_cleanup_job(struct drm_writeback_connector *connector,
50 		struct drm_writeback_job *job)
51 {
52 	struct dpu_wb_connector *dpu_wb_conn = to_dpu_wb_conn(connector);
53 
54 	if (!job->fb)
55 		return;
56 
57 	dpu_encoder_cleanup_wb_job(dpu_wb_conn->wb_enc, job);
58 }
59 
60 static const struct drm_connector_helper_funcs dpu_wb_conn_helper_funcs = {
61 	.get_modes = dpu_wb_conn_get_modes,
62 	.prepare_writeback_job = dpu_wb_conn_prepare_job,
63 	.cleanup_writeback_job = dpu_wb_conn_cleanup_job,
64 };
65 
66 int dpu_writeback_init(struct drm_device *dev, struct drm_encoder *enc,
67 		const u32 *format_list, u32 num_formats)
68 {
69 	struct dpu_wb_connector *dpu_wb_conn;
70 	int rc = 0;
71 
72 	dpu_wb_conn = devm_kzalloc(dev->dev, sizeof(*dpu_wb_conn), GFP_KERNEL);
73 	if (!dpu_wb_conn)
74 		return -ENOMEM;
75 
76 	drm_connector_helper_add(&dpu_wb_conn->base.base, &dpu_wb_conn_helper_funcs);
77 
78 	/* DPU initializes the encoder and sets it up completely for writeback
79 	 * cases and hence should use the new API drm_writeback_connector_init_with_encoder
80 	 * to initialize the writeback connector
81 	 */
82 	rc = drm_writeback_connector_init_with_encoder(dev, &dpu_wb_conn->base, enc,
83 			&dpu_wb_conn_funcs, format_list, num_formats);
84 
85 	if (!rc)
86 		dpu_wb_conn->wb_enc = enc;
87 
88 	return rc;
89 }
90