1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
 4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 5 */
 6
 7#include <linux/export.h>
 8
 9#include <drm/drm_crtc.h>
10#include <drm/drm_crtc_helper.h>
11#include <drm/drm_panel.h>
12#include <drm/drm_of.h>
13
14#include "tidss_crtc.h"
15#include "tidss_drv.h"
16#include "tidss_encoder.h"
17
18static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
19				      struct drm_crtc_state *crtc_state,
20				      struct drm_connector_state *conn_state)
21{
22	struct drm_device *ddev = encoder->dev;
23	struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
24	struct drm_display_info *di = &conn_state->connector->display_info;
25	struct drm_bridge *bridge;
26	bool bus_flags_set = false;
27
28	dev_dbg(ddev->dev, "%s\n", __func__);
29
30	/*
31	 * Take the bus_flags from the first bridge that defines
32	 * bridge timings, or from the connector's display_info if no
33	 * bridge defines the timings.
34	 */
35	drm_for_each_bridge_in_chain(encoder, bridge) {
36		if (!bridge->timings)
37			continue;
38
39		tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
40		bus_flags_set = true;
41		break;
42	}
43
44	if (!di->bus_formats || di->num_bus_formats == 0)  {
45		dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
46			__func__);
47		return -EINVAL;
48	}
49
50	// XXX any cleaner way to set bus format and flags?
51	tcrtc_state->bus_format = di->bus_formats[0];
52	if (!bus_flags_set)
53		tcrtc_state->bus_flags = di->bus_flags;
54
55	return 0;
56}
57
58static void tidss_encoder_destroy(struct drm_encoder *encoder)
59{
60	drm_encoder_cleanup(encoder);
61	kfree(encoder);
62}
63
64static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
65	.atomic_check = tidss_encoder_atomic_check,
66};
67
68static const struct drm_encoder_funcs encoder_funcs = {
69	.destroy = tidss_encoder_destroy,
70};
71
72struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
73					 u32 encoder_type, u32 possible_crtcs)
74{
75	struct drm_encoder *enc;
76	int ret;
77
78	enc = kzalloc(sizeof(*enc), GFP_KERNEL);
79	if (!enc)
80		return ERR_PTR(-ENOMEM);
81
82	enc->possible_crtcs = possible_crtcs;
83
84	ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
85			       encoder_type, NULL);
86	if (ret < 0) {
87		kfree(enc);
88		return ERR_PTR(ret);
89	}
90
91	drm_encoder_helper_add(enc, &encoder_helper_funcs);
92
93	dev_dbg(tidss->dev, "Encoder create done\n");
94
95	return enc;
96}