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}
147