Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
16static const u32 vkms_wb_formats[] = {
17 DRM_FORMAT_XRGB8888,
18};
19
20static const struct drm_connector_funcs vkms_wb_connector_funcs = {
21 .fill_modes = drm_helper_probe_single_connector_modes,
22 .destroy = drm_connector_cleanup,
23 .reset = drm_atomic_helper_connector_reset,
24 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
25 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
26};
27
28static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
29 struct drm_crtc_state *crtc_state,
30 struct drm_connector_state *conn_state)
31{
32 struct drm_framebuffer *fb;
33 const struct drm_display_mode *mode = &crtc_state->mode;
34
35 if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
36 return 0;
37
38 fb = conn_state->writeback_job->fb;
39 if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
40 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
41 fb->width, fb->height);
42 return -EINVAL;
43 }
44
45 if (fb->format->format != vkms_wb_formats[0]) {
46 DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
47 &fb->format->format);
48 return -EINVAL;
49 }
50
51 return 0;
52}
53
54static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
55 .atomic_check = vkms_wb_encoder_atomic_check,
56};
57
58static int vkms_wb_connector_get_modes(struct drm_connector *connector)
59{
60 struct drm_device *dev = connector->dev;
61
62 return drm_add_modes_noedid(connector, dev->mode_config.max_width,
63 dev->mode_config.max_height);
64}
65
66static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
67 struct drm_writeback_job *job)
68{
69 struct vkms_writeback_job *vkmsjob;
70 int ret;
71
72 if (!job->fb)
73 return 0;
74
75 vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
76 if (!vkmsjob)
77 return -ENOMEM;
78
79 ret = drm_gem_fb_vmap(job->fb, vkmsjob->map, vkmsjob->data);
80 if (ret) {
81 DRM_ERROR("vmap failed: %d\n", ret);
82 goto err_kfree;
83 }
84
85 job->priv = vkmsjob;
86
87 return 0;
88
89err_kfree:
90 kfree(vkmsjob);
91 return ret;
92}
93
94static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
95 struct drm_writeback_job *job)
96{
97 struct vkms_writeback_job *vkmsjob = job->priv;
98 struct vkms_device *vkmsdev;
99
100 if (!job->fb)
101 return;
102
103 drm_gem_fb_vunmap(job->fb, vkmsjob->map);
104
105 vkmsdev = drm_device_to_vkms_device(job->fb->dev);
106 vkms_set_composer(&vkmsdev->output, false);
107 kfree(vkmsjob);
108}
109
110static void vkms_wb_atomic_commit(struct drm_connector *conn,
111 struct drm_atomic_state *state)
112{
113 struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
114 conn);
115 struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
116 struct vkms_output *output = &vkmsdev->output;
117 struct drm_writeback_connector *wb_conn = &output->wb_connector;
118 struct drm_connector_state *conn_state = wb_conn->base.state;
119 struct vkms_crtc_state *crtc_state = output->composer_state;
120
121 if (!conn_state)
122 return;
123
124 vkms_set_composer(&vkmsdev->output, true);
125
126 spin_lock_irq(&output->composer_lock);
127 crtc_state->active_writeback = conn_state->writeback_job->priv;
128 crtc_state->wb_pending = true;
129 spin_unlock_irq(&output->composer_lock);
130 drm_writeback_queue_job(wb_conn, connector_state);
131}
132
133static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
134 .get_modes = vkms_wb_connector_get_modes,
135 .prepare_writeback_job = vkms_wb_prepare_job,
136 .cleanup_writeback_job = vkms_wb_cleanup_job,
137 .atomic_commit = vkms_wb_atomic_commit,
138};
139
140int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
141{
142 struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
143
144 drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
145
146 return drm_writeback_connector_init(&vkmsdev->drm, wb,
147 &vkms_wb_connector_funcs,
148 &vkms_wb_encoder_helper_funcs,
149 vkms_wb_formats,
150 ARRAY_SIZE(vkms_wb_formats),
151 1);
152}