Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
[pandora-kernel.git] / drivers / gpu / drm / omapdrm / omap_encoder.c
1 /*
2  * drivers/gpu/drm/omapdrm/omap_encoder.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Rob Clark <rob@ti.com>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License version 2 as published by
9  * the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include "omap_drv.h"
21
22 #include "drm_crtc.h"
23 #include "drm_crtc_helper.h"
24
25 #include <linux/list.h>
26
27
28 /*
29  * encoder funcs
30  */
31
32 #define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
33
34 /* The encoder and connector both map to same dssdev.. the encoder
35  * handles the 'active' parts, ie. anything the modifies the state
36  * of the hw, and the connector handles the 'read-only' parts, like
37  * detecting connection and reading edid.
38  */
39 struct omap_encoder {
40         struct drm_encoder base;
41         struct omap_dss_device *dssdev;
42 };
43
44 static void omap_encoder_destroy(struct drm_encoder *encoder)
45 {
46         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
47         drm_encoder_cleanup(encoder);
48         kfree(omap_encoder);
49 }
50
51 static const struct drm_encoder_funcs omap_encoder_funcs = {
52         .destroy = omap_encoder_destroy,
53 };
54
55 /*
56  * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right
57  * order.. the easiest way to work around this for now is to make all
58  * the encoder-helper's no-op's and have the omap_crtc code take care
59  * of the sequencing and call us in the right points.
60  *
61  * Eventually to handle connecting CRTCs to different encoders properly,
62  * either the CRTC helpers need to change or we need to replace
63  * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for
64  * that.
65  */
66
67 static void omap_encoder_dpms(struct drm_encoder *encoder, int mode)
68 {
69 }
70
71 static bool omap_encoder_mode_fixup(struct drm_encoder *encoder,
72                                   const struct drm_display_mode *mode,
73                                   struct drm_display_mode *adjusted_mode)
74 {
75         return true;
76 }
77
78 static void omap_encoder_mode_set(struct drm_encoder *encoder,
79                                 struct drm_display_mode *mode,
80                                 struct drm_display_mode *adjusted_mode)
81 {
82 }
83
84 static void omap_encoder_prepare(struct drm_encoder *encoder)
85 {
86 }
87
88 static void omap_encoder_commit(struct drm_encoder *encoder)
89 {
90 }
91
92 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
93         .dpms = omap_encoder_dpms,
94         .mode_fixup = omap_encoder_mode_fixup,
95         .mode_set = omap_encoder_mode_set,
96         .prepare = omap_encoder_prepare,
97         .commit = omap_encoder_commit,
98 };
99
100 /*
101  * Instead of relying on the helpers for modeset, the omap_crtc code
102  * calls these functions in the proper sequence.
103  */
104
105 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled)
106 {
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
111         if (enabled) {
112                 return dssdrv->enable(dssdev);
113         } else {
114                 dssdrv->disable(dssdev);
115                 return 0;
116         }
117 }
118
119 int omap_encoder_update(struct drm_encoder *encoder,
120                 struct omap_overlay_manager *mgr,
121                 struct omap_video_timings *timings)
122 {
123         struct drm_device *dev = encoder->dev;
124         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
125         struct omap_dss_device *dssdev = omap_encoder->dssdev;
126         struct omap_dss_driver *dssdrv = dssdev->driver;
127         int ret;
128
129         dssdev->output->manager = mgr;
130
131         ret = dssdrv->check_timings(dssdev, timings);
132         if (ret) {
133                 dev_err(dev->dev, "could not set timings: %d\n", ret);
134                 return ret;
135         }
136
137         dssdrv->set_timings(dssdev, timings);
138
139         return 0;
140 }
141
142 /* initialize encoder */
143 struct drm_encoder *omap_encoder_init(struct drm_device *dev,
144                 struct omap_dss_device *dssdev)
145 {
146         struct drm_encoder *encoder = NULL;
147         struct omap_encoder *omap_encoder;
148
149         omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
150         if (!omap_encoder)
151                 goto fail;
152
153         omap_encoder->dssdev = dssdev;
154
155         encoder = &omap_encoder->base;
156
157         drm_encoder_init(dev, encoder, &omap_encoder_funcs,
158                          DRM_MODE_ENCODER_TMDS);
159         drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
160
161         return encoder;
162
163 fail:
164         if (encoder)
165                 omap_encoder_destroy(encoder);
166
167         return NULL;
168 }