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