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 */
 39struct omap_encoder {
 40	struct drm_encoder base;
 41	struct omap_dss_device *dssdev;
 42};
 43
 44struct omap_dss_device *omap_encoder_get_dssdev(struct drm_encoder *encoder)
 45{
 46	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 47
 48	return omap_encoder->dssdev;
 49}
 50
 51static void omap_encoder_destroy(struct drm_encoder *encoder)
 52{
 53	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 54
 55	omap_encoder_set_enabled(encoder, false);
 56
 57	drm_encoder_cleanup(encoder);
 58	kfree(omap_encoder);
 59}
 60
 61static const struct drm_encoder_funcs omap_encoder_funcs = {
 62	.destroy = omap_encoder_destroy,
 63};
 64
 65/*
 66 * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right
 67 * order.. the easiest way to work around this for now is to make all
 68 * the encoder-helper's no-op's and have the omap_crtc code take care
 69 * of the sequencing and call us in the right points.
 70 *
 71 * Eventually to handle connecting CRTCs to different encoders properly,
 72 * either the CRTC helpers need to change or we need to replace
 73 * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for
 74 * that.
 75 */
 76
 77static void omap_encoder_dpms(struct drm_encoder *encoder, int mode)
 78{
 79}
 80
 81static bool omap_encoder_mode_fixup(struct drm_encoder *encoder,
 82				  const struct drm_display_mode *mode,
 83				  struct drm_display_mode *adjusted_mode)
 84{
 85	return true;
 86}
 87
 88static void omap_encoder_mode_set(struct drm_encoder *encoder,
 89				struct drm_display_mode *mode,
 90				struct drm_display_mode *adjusted_mode)
 91{
 92}
 93
 94static void omap_encoder_prepare(struct drm_encoder *encoder)
 95{
 96}
 97
 98static void omap_encoder_commit(struct drm_encoder *encoder)
 99{
100}
101
102static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
103	.dpms = omap_encoder_dpms,
104	.mode_fixup = omap_encoder_mode_fixup,
105	.mode_set = omap_encoder_mode_set,
106	.prepare = omap_encoder_prepare,
107	.commit = omap_encoder_commit,
108};
109
110/*
111 * Instead of relying on the helpers for modeset, the omap_crtc code
112 * calls these functions in the proper sequence.
113 */
114
115int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled)
116{
117	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
118	struct omap_dss_device *dssdev = omap_encoder->dssdev;
119	struct omap_dss_driver *dssdrv = dssdev->driver;
120
121	if (enabled) {
122		return dssdrv->enable(dssdev);
123	} else {
124		dssdrv->disable(dssdev);
125		return 0;
126	}
127}
128
129int omap_encoder_update(struct drm_encoder *encoder,
130		struct omap_overlay_manager *mgr,
131		struct omap_video_timings *timings)
132{
133	struct drm_device *dev = encoder->dev;
134	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
135	struct omap_dss_device *dssdev = omap_encoder->dssdev;
136	struct omap_dss_driver *dssdrv = dssdev->driver;
137	int ret;
138
139	dssdev->src->manager = mgr;
140
141	if (dssdrv->check_timings) {
142		ret = dssdrv->check_timings(dssdev, timings);
143	} else {
144		struct omap_video_timings t = {0};
145
146		dssdrv->get_timings(dssdev, &t);
147
148		if (memcmp(timings, &t, sizeof(struct omap_video_timings)))
149			ret = -EINVAL;
150		else
151			ret = 0;
152	}
153
154	if (ret) {
155		dev_err(dev->dev, "could not set timings: %d\n", ret);
156		return ret;
157	}
158
159	if (dssdrv->set_timings)
160		dssdrv->set_timings(dssdev, timings);
161
162	return 0;
163}
164
165/* initialize encoder */
166struct drm_encoder *omap_encoder_init(struct drm_device *dev,
167		struct omap_dss_device *dssdev)
168{
169	struct drm_encoder *encoder = NULL;
170	struct omap_encoder *omap_encoder;
171
172	omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
173	if (!omap_encoder)
174		goto fail;
175
176	omap_encoder->dssdev = dssdev;
177
178	encoder = &omap_encoder->base;
179
180	drm_encoder_init(dev, encoder, &omap_encoder_funcs,
181			 DRM_MODE_ENCODER_TMDS);
182	drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
183
184	return encoder;
185
186fail:
187	if (encoder)
188		omap_encoder_destroy(encoder);
189
190	return NULL;
191}