1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/iosys-map.h>
4
5#include <drm/drm_atomic.h>
6#include <drm/drm_edid.h>
7#include <drm/drm_fourcc.h>
8#include <drm/drm_writeback.h>
9#include <drm/drm_probe_helper.h>
10#include <drm/drm_atomic_helper.h>
11#include <drm/drm_gem_framebuffer_helper.h>
12#include <drm/drm_gem_shmem_helper.h>
13
14#include "vkms_drv.h"
15#include "vkms_formats.h"
16
17static const u32 vkms_wb_formats[] = {
18	DRM_FORMAT_ARGB8888,
19	DRM_FORMAT_XRGB8888,
20	DRM_FORMAT_XRGB16161616,
21	DRM_FORMAT_ARGB16161616,
22	DRM_FORMAT_RGB565
23};
24
25static const struct drm_connector_funcs vkms_wb_connector_funcs = {
26	.fill_modes = drm_helper_probe_single_connector_modes,
27	.destroy = drm_connector_cleanup,
28	.reset = drm_atomic_helper_connector_reset,
29	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
30	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
31};
32
33static int vkms_wb_atomic_check(struct drm_connector *connector,
34				struct drm_atomic_state *state)
35{
36	struct drm_connector_state *conn_state =
37		drm_atomic_get_new_connector_state(state, connector);
38	struct drm_crtc_state *crtc_state;
39	struct drm_framebuffer *fb;
40	const struct drm_display_mode *mode;
41	int ret;
42
43	if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
44		return 0;
45
46	if (!conn_state->crtc)
47		return 0;
48
49	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
50	mode = &crtc_state->mode;
51
52	fb = conn_state->writeback_job->fb;
53	if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
54		DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
55			      fb->width, fb->height);
56		return -EINVAL;
57	}
58
59	ret = drm_atomic_helper_check_wb_connector_state(connector, state);
60	if (ret < 0)
61		return ret;
62
63	return 0;
64}
65
66static int vkms_wb_connector_get_modes(struct drm_connector *connector)
67{
68	struct drm_device *dev = connector->dev;
69
70	return drm_add_modes_noedid(connector, dev->mode_config.max_width,
71				    dev->mode_config.max_height);
72}
73
74static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
75			       struct drm_writeback_job *job)
76{
77	struct vkms_writeback_job *vkmsjob;
78	int ret;
79
80	if (!job->fb)
81		return 0;
82
83	vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
84	if (!vkmsjob)
85		return -ENOMEM;
86
87	ret = drm_gem_fb_vmap(job->fb, vkmsjob->wb_frame_info.map, vkmsjob->data);
88	if (ret) {
89		DRM_ERROR("vmap failed: %d\n", ret);
90		goto err_kfree;
91	}
92
93	vkmsjob->wb_frame_info.fb = job->fb;
94	drm_framebuffer_get(vkmsjob->wb_frame_info.fb);
95
96	job->priv = vkmsjob;
97
98	return 0;
99
100err_kfree:
101	kfree(vkmsjob);
102	return ret;
103}
104
105static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
106				struct drm_writeback_job *job)
107{
108	struct vkms_writeback_job *vkmsjob = job->priv;
109	struct vkms_device *vkmsdev;
110
111	if (!job->fb)
112		return;
113
114	drm_gem_fb_vunmap(job->fb, vkmsjob->wb_frame_info.map);
115
116	drm_framebuffer_put(vkmsjob->wb_frame_info.fb);
117
118	vkmsdev = drm_device_to_vkms_device(job->fb->dev);
119	vkms_set_composer(&vkmsdev->output, false);
120	kfree(vkmsjob);
121}
122
123static void vkms_wb_atomic_commit(struct drm_connector *conn,
124				  struct drm_atomic_state *state)
125{
126	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
127											 conn);
128	struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
129	struct vkms_output *output = &vkmsdev->output;
130	struct drm_writeback_connector *wb_conn = &output->wb_connector;
131	struct drm_connector_state *conn_state = wb_conn->base.state;
132	struct vkms_crtc_state *crtc_state = output->composer_state;
133	struct drm_framebuffer *fb = connector_state->writeback_job->fb;
134	u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
135	u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
136	struct vkms_writeback_job *active_wb;
137	struct vkms_frame_info *wb_frame_info;
138	u32 wb_format = fb->format->format;
139
140	if (!conn_state)
141		return;
142
143	vkms_set_composer(&vkmsdev->output, true);
144
145	active_wb = conn_state->writeback_job->priv;
146	wb_frame_info = &active_wb->wb_frame_info;
147
148	spin_lock_irq(&output->composer_lock);
149	crtc_state->active_writeback = active_wb;
150	crtc_state->wb_pending = true;
151	spin_unlock_irq(&output->composer_lock);
152
153	wb_frame_info->offset = fb->offsets[0];
154	wb_frame_info->pitch = fb->pitches[0];
155	wb_frame_info->cpp = fb->format->cpp[0];
156
157	drm_writeback_queue_job(wb_conn, connector_state);
158	active_wb->pixel_write = get_pixel_write_function(wb_format);
159	drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
160	drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height);
161}
162
163static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
164	.get_modes = vkms_wb_connector_get_modes,
165	.prepare_writeback_job = vkms_wb_prepare_job,
166	.cleanup_writeback_job = vkms_wb_cleanup_job,
167	.atomic_commit = vkms_wb_atomic_commit,
168	.atomic_check = vkms_wb_atomic_check,
169};
170
171int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
172{
173	struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
174
175	drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
176
177	return drm_writeback_connector_init(&vkmsdev->drm, wb,
178					    &vkms_wb_connector_funcs,
179					    NULL,
180					    vkms_wb_formats,
181					    ARRAY_SIZE(vkms_wb_formats),
182					    1);
183}
184