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_encoder_atomic_check(struct drm_encoder *encoder,
34					struct drm_crtc_state *crtc_state,
35					struct drm_connector_state *conn_state)
36{
37	struct drm_framebuffer *fb;
38	const struct drm_display_mode *mode = &crtc_state->mode;
39	int ret;
40
41	if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
42		return 0;
43
44	fb = conn_state->writeback_job->fb;
45	if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
46		DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
47			      fb->width, fb->height);
48		return -EINVAL;
49	}
50
51	ret = drm_atomic_helper_check_wb_encoder_state(encoder, conn_state);
52	if (ret < 0)
53		return ret;
54
55	return 0;
56}
57
58static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
59	.atomic_check = vkms_wb_encoder_atomic_check,
60};
61
62static int vkms_wb_connector_get_modes(struct drm_connector *connector)
63{
64	struct drm_device *dev = connector->dev;
65
66	return drm_add_modes_noedid(connector, dev->mode_config.max_width,
67				    dev->mode_config.max_height);
68}
69
70static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
71			       struct drm_writeback_job *job)
72{
73	struct vkms_writeback_job *vkmsjob;
74	int ret;
75
76	if (!job->fb)
77		return 0;
78
79	vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
80	if (!vkmsjob)
81		return -ENOMEM;
82
83	ret = drm_gem_fb_vmap(job->fb, vkmsjob->wb_frame_info.map, vkmsjob->data);
84	if (ret) {
85		DRM_ERROR("vmap failed: %d\n", ret);
86		goto err_kfree;
87	}
88
89	vkmsjob->wb_frame_info.fb = job->fb;
90	drm_framebuffer_get(vkmsjob->wb_frame_info.fb);
91
92	job->priv = vkmsjob;
93
94	return 0;
95
96err_kfree:
97	kfree(vkmsjob);
98	return ret;
99}
100
101static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
102				struct drm_writeback_job *job)
103{
104	struct vkms_writeback_job *vkmsjob = job->priv;
105	struct vkms_device *vkmsdev;
106
107	if (!job->fb)
108		return;
109
110	drm_gem_fb_vunmap(job->fb, vkmsjob->wb_frame_info.map);
111
112	drm_framebuffer_put(vkmsjob->wb_frame_info.fb);
113
114	vkmsdev = drm_device_to_vkms_device(job->fb->dev);
115	vkms_set_composer(&vkmsdev->output, false);
116	kfree(vkmsjob);
117}
118
119static void vkms_wb_atomic_commit(struct drm_connector *conn,
120				  struct drm_atomic_state *state)
121{
122	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
123											 conn);
124	struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
125	struct vkms_output *output = &vkmsdev->output;
126	struct drm_writeback_connector *wb_conn = &output->wb_connector;
127	struct drm_connector_state *conn_state = wb_conn->base.state;
128	struct vkms_crtc_state *crtc_state = output->composer_state;
129	struct drm_framebuffer *fb = connector_state->writeback_job->fb;
130	u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
131	u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
132	struct vkms_writeback_job *active_wb;
133	struct vkms_frame_info *wb_frame_info;
134	u32 wb_format = fb->format->format;
135
136	if (!conn_state)
137		return;
138
139	vkms_set_composer(&vkmsdev->output, true);
140
141	active_wb = conn_state->writeback_job->priv;
142	wb_frame_info = &active_wb->wb_frame_info;
143
144	spin_lock_irq(&output->composer_lock);
145	crtc_state->active_writeback = active_wb;
146	crtc_state->wb_pending = true;
147	spin_unlock_irq(&output->composer_lock);
148
149	wb_frame_info->offset = fb->offsets[0];
150	wb_frame_info->pitch = fb->pitches[0];
151	wb_frame_info->cpp = fb->format->cpp[0];
152
153	drm_writeback_queue_job(wb_conn, connector_state);
154	active_wb->pixel_write = get_pixel_write_function(wb_format);
155	drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
156	drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height);
157}
158
159static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
160	.get_modes = vkms_wb_connector_get_modes,
161	.prepare_writeback_job = vkms_wb_prepare_job,
162	.cleanup_writeback_job = vkms_wb_cleanup_job,
163	.atomic_commit = vkms_wb_atomic_commit,
164};
165
166int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
167{
168	struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
169
170	drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
171
172	return drm_writeback_connector_init(&vkmsdev->drm, wb,
173					    &vkms_wb_connector_funcs,
174					    &vkms_wb_encoder_helper_funcs,
175					    vkms_wb_formats,
176					    ARRAY_SIZE(vkms_wb_formats),
177					    1);
178}
179