1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
5 *
6 */
7#include <drm/drm_framebuffer.h>
8#include "komeda_dev.h"
9#include "komeda_kms.h"
10
11static int
12komeda_wb_init_data_flow(struct komeda_layer *wb_layer,
13			 struct drm_connector_state *conn_st,
14			 struct komeda_crtc_state *kcrtc_st,
15			 struct komeda_data_flow_cfg *dflow)
16{
17	struct drm_framebuffer *fb = conn_st->writeback_job->fb;
18
19	memset(dflow, 0, sizeof(*dflow));
20
21	dflow->out_w = fb->width;
22	dflow->out_h = fb->height;
23
24	/* the write back data comes from the compiz */
25	pipeline_composition_size(kcrtc_st, &dflow->in_w, &dflow->in_h);
26	dflow->input.component = &wb_layer->base.pipeline->compiz->base;
27	/* compiz doesn't output alpha */
28	dflow->pixel_blend_mode = DRM_MODE_BLEND_PIXEL_NONE;
29	dflow->rot = DRM_MODE_ROTATE_0;
30
31	komeda_complete_data_flow_cfg(wb_layer, dflow, fb);
32
33	return 0;
34}
35
36static int
37komeda_wb_encoder_atomic_check(struct drm_encoder *encoder,
38			       struct drm_crtc_state *crtc_st,
39			       struct drm_connector_state *conn_st)
40{
41	struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
42	struct drm_writeback_job *writeback_job = conn_st->writeback_job;
43	struct komeda_layer *wb_layer;
44	struct komeda_data_flow_cfg dflow;
45	int err;
46
47	if (!writeback_job)
48		return 0;
49
50	if (!crtc_st->active) {
51		DRM_DEBUG_ATOMIC("Cannot write the composition result out on a inactive CRTC.\n");
52		return -EINVAL;
53	}
54
55	wb_layer = to_kconn(to_wb_conn(conn_st->connector))->wb_layer;
56
57	/*
58	 * No need for a full modested when the only connector changed is the
59	 * writeback connector.
60	 */
61	if (crtc_st->connectors_changed &&
62	    is_only_changed_connector(crtc_st, conn_st->connector))
63		crtc_st->connectors_changed = false;
64
65	err = komeda_wb_init_data_flow(wb_layer, conn_st, kcrtc_st, &dflow);
66	if (err)
67		return err;
68
69	if (dflow.en_split)
70		err = komeda_build_wb_split_data_flow(wb_layer,
71				conn_st, kcrtc_st, &dflow);
72	else
73		err = komeda_build_wb_data_flow(wb_layer,
74				conn_st, kcrtc_st, &dflow);
75
76	return err;
77}
78
79static const struct drm_encoder_helper_funcs komeda_wb_encoder_helper_funcs = {
80	.atomic_check = komeda_wb_encoder_atomic_check,
81};
82
83static int
84komeda_wb_connector_get_modes(struct drm_connector *connector)
85{
86	return 0;
87}
88
89static enum drm_mode_status
90komeda_wb_connector_mode_valid(struct drm_connector *connector,
91			       struct drm_display_mode *mode)
92{
93	struct drm_device *dev = connector->dev;
94	struct drm_mode_config *mode_config = &dev->mode_config;
95	int w = mode->hdisplay, h = mode->vdisplay;
96
97	if ((w < mode_config->min_width) || (w > mode_config->max_width))
98		return MODE_BAD_HVALUE;
99
100	if ((h < mode_config->min_height) || (h > mode_config->max_height))
101		return MODE_BAD_VVALUE;
102
103	return MODE_OK;
104}
105
106static const struct drm_connector_helper_funcs komeda_wb_conn_helper_funcs = {
107	.get_modes	= komeda_wb_connector_get_modes,
108	.mode_valid	= komeda_wb_connector_mode_valid,
109};
110
111static enum drm_connector_status
112komeda_wb_connector_detect(struct drm_connector *connector, bool force)
113{
114	return connector_status_connected;
115}
116
117static int
118komeda_wb_connector_fill_modes(struct drm_connector *connector,
119			       uint32_t maxX, uint32_t maxY)
120{
121	return 0;
122}
123
124static void komeda_wb_connector_destroy(struct drm_connector *connector)
125{
126	drm_connector_cleanup(connector);
127	kfree(to_kconn(to_wb_conn(connector)));
128}
129
130static const struct drm_connector_funcs komeda_wb_connector_funcs = {
131	.reset			= drm_atomic_helper_connector_reset,
132	.detect			= komeda_wb_connector_detect,
133	.fill_modes		= komeda_wb_connector_fill_modes,
134	.destroy		= komeda_wb_connector_destroy,
135	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
136	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
137};
138
139static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
140				   struct komeda_crtc *kcrtc)
141{
142	struct komeda_dev *mdev = kms->base.dev_private;
143	struct komeda_wb_connector *kwb_conn;
144	struct drm_writeback_connector *wb_conn;
145	struct drm_display_info *info;
146	u32 *formats, n_formats = 0;
147	int err;
148
149	if (!kcrtc->master->wb_layer)
150		return 0;
151
152	kwb_conn = kzalloc(sizeof(*kwb_conn), GFP_KERNEL);
153	if (!kwb_conn)
154		return -ENOMEM;
155
156	kwb_conn->wb_layer = kcrtc->master->wb_layer;
157
158	wb_conn = &kwb_conn->base;
159
160	formats = komeda_get_layer_fourcc_list(&mdev->fmt_tbl,
161					       kwb_conn->wb_layer->layer_type,
162					       &n_formats);
163
164	err = drm_writeback_connector_init(&kms->base, wb_conn,
165					   &komeda_wb_connector_funcs,
166					   &komeda_wb_encoder_helper_funcs,
167					   formats, n_formats,
168					   BIT(drm_crtc_index(&kcrtc->base)));
169	komeda_put_fourcc_list(formats);
170	if (err) {
171		kfree(kwb_conn);
172		return err;
173	}
174
175	drm_connector_helper_add(&wb_conn->base, &komeda_wb_conn_helper_funcs);
176
177	info = &kwb_conn->base.base.display_info;
178	info->bpc = __fls(kcrtc->master->improc->supported_color_depths);
179	info->color_formats = kcrtc->master->improc->supported_color_formats;
180
181	kcrtc->wb_conn = kwb_conn;
182
183	return 0;
184}
185
186int komeda_kms_add_wb_connectors(struct komeda_kms_dev *kms,
187				 struct komeda_dev *mdev)
188{
189	int i, err;
190
191	for (i = 0; i < kms->n_crtcs; i++) {
192		err = komeda_wb_connector_add(kms, &kms->crtcs[i]);
193		if (err)
194			return err;
195	}
196
197	return 0;
198}
199