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_fourcc.h> 7 #include <drm/drm_writeback.h> 8 #include <drm/drm_probe_helper.h> 9 #include <drm/drm_atomic_helper.h> 10 #include <drm/drm_gem_framebuffer_helper.h> 11 #include <drm/drm_gem_shmem_helper.h> 12 13 #include "vkms_drv.h" 14 15 static const u32 vkms_wb_formats[] = { 16 DRM_FORMAT_XRGB8888, 17 }; 18 19 static const struct drm_connector_funcs vkms_wb_connector_funcs = { 20 .fill_modes = drm_helper_probe_single_connector_modes, 21 .destroy = drm_connector_cleanup, 22 .reset = drm_atomic_helper_connector_reset, 23 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 24 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 25 }; 26 27 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder, 28 struct drm_crtc_state *crtc_state, 29 struct drm_connector_state *conn_state) 30 { 31 struct drm_framebuffer *fb; 32 const struct drm_display_mode *mode = &crtc_state->mode; 33 34 if (!conn_state->writeback_job || !conn_state->writeback_job->fb) 35 return 0; 36 37 fb = conn_state->writeback_job->fb; 38 if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) { 39 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n", 40 fb->width, fb->height); 41 return -EINVAL; 42 } 43 44 if (fb->format->format != vkms_wb_formats[0]) { 45 DRM_DEBUG_KMS("Invalid pixel format %p4cc\n", 46 &fb->format->format); 47 return -EINVAL; 48 } 49 50 return 0; 51 } 52 53 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = { 54 .atomic_check = vkms_wb_encoder_atomic_check, 55 }; 56 57 static int vkms_wb_connector_get_modes(struct drm_connector *connector) 58 { 59 struct drm_device *dev = connector->dev; 60 61 return drm_add_modes_noedid(connector, dev->mode_config.max_width, 62 dev->mode_config.max_height); 63 } 64 65 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector, 66 struct drm_writeback_job *job) 67 { 68 struct vkms_writeback_job *vkmsjob; 69 int ret; 70 71 if (!job->fb) 72 return 0; 73 74 vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL); 75 if (!vkmsjob) 76 return -ENOMEM; 77 78 ret = drm_gem_fb_vmap(job->fb, vkmsjob->map, vkmsjob->data); 79 if (ret) { 80 DRM_ERROR("vmap failed: %d\n", ret); 81 goto err_kfree; 82 } 83 84 job->priv = vkmsjob; 85 86 return 0; 87 88 err_kfree: 89 kfree(vkmsjob); 90 return ret; 91 } 92 93 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector, 94 struct drm_writeback_job *job) 95 { 96 struct vkms_writeback_job *vkmsjob = job->priv; 97 struct vkms_device *vkmsdev; 98 99 if (!job->fb) 100 return; 101 102 drm_gem_fb_vunmap(job->fb, vkmsjob->map); 103 104 vkmsdev = drm_device_to_vkms_device(job->fb->dev); 105 vkms_set_composer(&vkmsdev->output, false); 106 kfree(vkmsjob); 107 } 108 109 static void vkms_wb_atomic_commit(struct drm_connector *conn, 110 struct drm_atomic_state *state) 111 { 112 struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state, 113 conn); 114 struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev); 115 struct vkms_output *output = &vkmsdev->output; 116 struct drm_writeback_connector *wb_conn = &output->wb_connector; 117 struct drm_connector_state *conn_state = wb_conn->base.state; 118 struct vkms_crtc_state *crtc_state = output->composer_state; 119 120 if (!conn_state) 121 return; 122 123 vkms_set_composer(&vkmsdev->output, true); 124 125 spin_lock_irq(&output->composer_lock); 126 crtc_state->active_writeback = conn_state->writeback_job->priv; 127 crtc_state->wb_pending = true; 128 spin_unlock_irq(&output->composer_lock); 129 drm_writeback_queue_job(wb_conn, connector_state); 130 } 131 132 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = { 133 .get_modes = vkms_wb_connector_get_modes, 134 .prepare_writeback_job = vkms_wb_prepare_job, 135 .cleanup_writeback_job = vkms_wb_cleanup_job, 136 .atomic_commit = vkms_wb_atomic_commit, 137 }; 138 139 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev) 140 { 141 struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector; 142 143 vkmsdev->output.wb_connector.encoder.possible_crtcs = 1; 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 } 152