1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2011 Texas Instruments Incorporated - http://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 omap_dss_device *dssdev;
 79	struct drm_device *dev = encoder->dev;
 80	struct drm_connector *connector;
 81	struct drm_bridge *bridge;
 82	struct videomode vm = { 0 };
 83	u32 bus_flags;
 84
 85	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 86		if (connector->encoder == encoder)
 87			break;
 88	}
 89
 90	drm_display_mode_to_videomode(adjusted_mode, &vm);
 91
 92	/*
 93	 * HACK: This fixes the vm flags.
 94	 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and
 95	 * they get lost when converting back and forth between struct
 96	 * drm_display_mode and struct videomode. The hack below goes and
 97	 * fetches the missing flags.
 98	 *
 99	 * A better solution is to use DRM's bus-flags through the whole driver.
100	 */
101	for (dssdev = output; dssdev; dssdev = dssdev->next)
102		omap_encoder_update_videomode_flags(&vm, dssdev->bus_flags);
103
104	for (bridge = output->bridge; bridge;
105	     bridge = drm_bridge_get_next_bridge(bridge)) {
106		if (!bridge->timings)
107			continue;
108
109		bus_flags = bridge->timings->input_bus_flags;
110		omap_encoder_update_videomode_flags(&vm, bus_flags);
111	}
112
113	bus_flags = connector->display_info.bus_flags;
114	omap_encoder_update_videomode_flags(&vm, bus_flags);
115
116	/* Set timings for the dss manager. */
117	dss_mgr_set_timings(output, &vm);
118}
119
120static void omap_encoder_disable(struct drm_encoder *encoder)
121{
122	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
123	struct omap_dss_device *dssdev = omap_encoder->output;
124	struct drm_device *dev = encoder->dev;
125
126	dev_dbg(dev->dev, "disable(%s)\n", dssdev->name);
127
128	/*
129	 * Disable the chain of external devices, starting at the one at the
130	 * internal encoder's output. This is used for DSI outputs only, as
131	 * dssdev->next is NULL for all other outputs.
132	 */
133	omapdss_device_disable(dssdev->next);
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->output;
140	struct drm_device *dev = encoder->dev;
141
142	dev_dbg(dev->dev, "enable(%s)\n", dssdev->name);
143
144	/*
145	 * Enable the chain of external devices, starting at the one at the
146	 * internal encoder's output. This is used for DSI outputs only, as
147	 * dssdev->next is NULL for all other outputs.
148	 */
149	omapdss_device_enable(dssdev->next);
150}
151
152static int omap_encoder_atomic_check(struct drm_encoder *encoder,
153				     struct drm_crtc_state *crtc_state,
154				     struct drm_connector_state *conn_state)
155{
156	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
157	enum drm_mode_status status;
158
159	status = omap_connector_mode_fixup(omap_encoder->output,
160					   &crtc_state->mode,
161					   &crtc_state->adjusted_mode);
162	if (status != MODE_OK) {
163		dev_err(encoder->dev->dev, "invalid timings: %d\n", status);
164		return -EINVAL;
165	}
166
167	return 0;
168}
169
170static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
171	.mode_set = omap_encoder_mode_set,
172	.disable = omap_encoder_disable,
173	.enable = omap_encoder_enable,
174	.atomic_check = omap_encoder_atomic_check,
175};
176
177/* initialize encoder */
178struct drm_encoder *omap_encoder_init(struct drm_device *dev,
179				      struct omap_dss_device *output)
180{
181	struct drm_encoder *encoder = NULL;
182	struct omap_encoder *omap_encoder;
183
184	omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
185	if (!omap_encoder)
186		goto fail;
187
188	omap_encoder->output = output;
189
190	encoder = &omap_encoder->base;
191
192	drm_encoder_init(dev, encoder, &omap_encoder_funcs,
193			 DRM_MODE_ENCODER_TMDS, NULL);
194	drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
195
196	return encoder;
197
198fail:
199	if (encoder)
200		omap_encoder_destroy(encoder);
201
202	return NULL;
203}