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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Rob Clark <rob@ti.com>
5 */
6
7#include <linux/list.h>
8
9#include <drm/drm_bridge.h>
10#include <drm/drm_crtc.h>
11#include <drm/drm_modeset_helper_vtables.h>
12#include <drm/drm_edid.h>
13
14#include "omap_drv.h"
15
16/*
17 * encoder funcs
18 */
19
20#define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
21
22/* The encoder and connector both map to same dssdev.. the encoder
23 * handles the 'active' parts, ie. anything the modifies the state
24 * of the hw, and the connector handles the 'read-only' parts, like
25 * detecting connection and reading edid.
26 */
27struct omap_encoder {
28 struct drm_encoder base;
29 struct omap_dss_device *output;
30};
31
32static void omap_encoder_destroy(struct drm_encoder *encoder)
33{
34 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
35
36 drm_encoder_cleanup(encoder);
37 kfree(omap_encoder);
38}
39
40static const struct drm_encoder_funcs omap_encoder_funcs = {
41 .destroy = omap_encoder_destroy,
42};
43
44static void omap_encoder_update_videomode_flags(struct videomode *vm,
45 u32 bus_flags)
46{
47 if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW |
48 DISPLAY_FLAGS_DE_HIGH))) {
49 if (bus_flags & DRM_BUS_FLAG_DE_LOW)
50 vm->flags |= DISPLAY_FLAGS_DE_LOW;
51 else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
52 vm->flags |= DISPLAY_FLAGS_DE_HIGH;
53 }
54
55 if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
56 DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {
57 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
58 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
59 else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
60 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
61 }
62
63 if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE |
64 DISPLAY_FLAGS_SYNC_NEGEDGE))) {
65 if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE)
66 vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE;
67 else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE)
68 vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;
69 }
70}
71
72static void omap_encoder_mode_set(struct drm_encoder *encoder,
73 struct drm_display_mode *mode,
74 struct drm_display_mode *adjusted_mode)
75{
76 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
77 struct omap_dss_device *output = omap_encoder->output;
78 struct drm_device *dev = encoder->dev;
79 struct drm_connector *connector;
80 struct drm_bridge *bridge;
81 struct videomode vm = { 0 };
82 u32 bus_flags;
83
84 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
85 if (connector->encoder == encoder)
86 break;
87 }
88
89 drm_display_mode_to_videomode(adjusted_mode, &vm);
90
91 /*
92 * HACK: This fixes the vm flags.
93 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and
94 * they get lost when converting back and forth between struct
95 * drm_display_mode and struct videomode. The hack below goes and
96 * fetches the missing flags.
97 *
98 * A better solution is to use DRM's bus-flags through the whole driver.
99 */
100 for (bridge = output->bridge; bridge;
101 bridge = drm_bridge_get_next_bridge(bridge)) {
102 if (!bridge->timings)
103 continue;
104
105 bus_flags = bridge->timings->input_bus_flags;
106 omap_encoder_update_videomode_flags(&vm, bus_flags);
107 }
108
109 bus_flags = connector->display_info.bus_flags;
110 omap_encoder_update_videomode_flags(&vm, bus_flags);
111
112 /* Set timings for all devices in the display pipeline. */
113 dss_mgr_set_timings(output, &vm);
114}
115
116static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
117 .mode_set = omap_encoder_mode_set,
118};
119
120/* initialize encoder */
121struct drm_encoder *omap_encoder_init(struct drm_device *dev,
122 struct omap_dss_device *output)
123{
124 struct drm_encoder *encoder = NULL;
125 struct omap_encoder *omap_encoder;
126
127 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
128 if (!omap_encoder)
129 goto fail;
130
131 omap_encoder->output = output;
132
133 encoder = &omap_encoder->base;
134
135 drm_encoder_init(dev, encoder, &omap_encoder_funcs,
136 DRM_MODE_ENCODER_TMDS, NULL);
137 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
138
139 return encoder;
140
141fail:
142 if (encoder)
143 omap_encoder_destroy(encoder);
144
145 return NULL;
146}
1/*
2 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
3 * Author: Rob Clark <rob@ti.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <linux/list.h>
19
20#include <drm/drm_crtc.h>
21#include <drm/drm_crtc_helper.h>
22#include <drm/drm_edid.h>
23
24#include "omap_drv.h"
25
26/*
27 * encoder funcs
28 */
29
30#define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
31
32/* The encoder and connector both map to same dssdev.. the encoder
33 * handles the 'active' parts, ie. anything the modifies the state
34 * of the hw, and the connector handles the 'read-only' parts, like
35 * detecting connection and reading edid.
36 */
37struct omap_encoder {
38 struct drm_encoder base;
39 struct omap_dss_device *dssdev;
40};
41
42struct omap_dss_device *omap_encoder_get_dssdev(struct drm_encoder *encoder)
43{
44 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
45
46 return omap_encoder->dssdev;
47}
48
49static void omap_encoder_destroy(struct drm_encoder *encoder)
50{
51 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
52
53 drm_encoder_cleanup(encoder);
54 kfree(omap_encoder);
55}
56
57static const struct drm_encoder_funcs omap_encoder_funcs = {
58 .destroy = omap_encoder_destroy,
59};
60
61static void omap_encoder_mode_set(struct drm_encoder *encoder,
62 struct drm_display_mode *mode,
63 struct drm_display_mode *adjusted_mode)
64{
65 struct drm_device *dev = encoder->dev;
66 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
67 struct omap_dss_device *dssdev = omap_encoder->dssdev;
68 struct drm_connector *connector;
69 bool hdmi_mode;
70 int r;
71
72 hdmi_mode = false;
73 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
74 if (connector->encoder == encoder) {
75 hdmi_mode = omap_connector_get_hdmi_mode(connector);
76 break;
77 }
78 }
79
80 if (dssdev->driver->set_hdmi_mode)
81 dssdev->driver->set_hdmi_mode(dssdev, hdmi_mode);
82
83 if (hdmi_mode && dssdev->driver->set_hdmi_infoframe) {
84 struct hdmi_avi_infoframe avi;
85
86 r = drm_hdmi_avi_infoframe_from_display_mode(&avi, adjusted_mode,
87 false);
88 if (r == 0)
89 dssdev->driver->set_hdmi_infoframe(dssdev, &avi);
90 }
91}
92
93static void omap_encoder_disable(struct drm_encoder *encoder)
94{
95 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
96 struct omap_dss_device *dssdev = omap_encoder->dssdev;
97 struct omap_dss_driver *dssdrv = dssdev->driver;
98
99 dssdrv->disable(dssdev);
100}
101
102static int omap_encoder_update(struct drm_encoder *encoder,
103 enum omap_channel channel,
104 struct videomode *vm)
105{
106 struct drm_device *dev = encoder->dev;
107 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
108 struct omap_dss_device *dssdev = omap_encoder->dssdev;
109 struct omap_dss_driver *dssdrv = dssdev->driver;
110 int ret;
111
112 if (dssdrv->check_timings) {
113 ret = dssdrv->check_timings(dssdev, vm);
114 } else {
115 struct videomode t = {0};
116
117 dssdrv->get_timings(dssdev, &t);
118
119 if (memcmp(vm, &t, sizeof(*vm)))
120 ret = -EINVAL;
121 else
122 ret = 0;
123 }
124
125 if (ret) {
126 dev_err(dev->dev, "could not set timings: %d\n", ret);
127 return ret;
128 }
129
130 if (dssdrv->set_timings)
131 dssdrv->set_timings(dssdev, vm);
132
133 return 0;
134}
135
136static void omap_encoder_enable(struct drm_encoder *encoder)
137{
138 struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
139 struct omap_dss_device *dssdev = omap_encoder->dssdev;
140 struct omap_dss_driver *dssdrv = dssdev->driver;
141 int r;
142
143 omap_encoder_update(encoder, omap_crtc_channel(encoder->crtc),
144 omap_crtc_timings(encoder->crtc));
145
146 r = dssdrv->enable(dssdev);
147 if (r)
148 dev_err(encoder->dev->dev,
149 "Failed to enable display '%s': %d\n",
150 dssdev->name, r);
151}
152
153static int omap_encoder_atomic_check(struct drm_encoder *encoder,
154 struct drm_crtc_state *crtc_state,
155 struct drm_connector_state *conn_state)
156{
157 return 0;
158}
159
160static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
161 .mode_set = omap_encoder_mode_set,
162 .disable = omap_encoder_disable,
163 .enable = omap_encoder_enable,
164 .atomic_check = omap_encoder_atomic_check,
165};
166
167/* initialize encoder */
168struct drm_encoder *omap_encoder_init(struct drm_device *dev,
169 struct omap_dss_device *dssdev)
170{
171 struct drm_encoder *encoder = NULL;
172 struct omap_encoder *omap_encoder;
173
174 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
175 if (!omap_encoder)
176 goto fail;
177
178 omap_encoder->dssdev = dssdev;
179
180 encoder = &omap_encoder->base;
181
182 drm_encoder_init(dev, encoder, &omap_encoder_funcs,
183 DRM_MODE_ENCODER_TMDS, NULL);
184 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
185
186 return encoder;
187
188fail:
189 if (encoder)
190 omap_encoder_destroy(encoder);
191
192 return NULL;
193}