xref: /linux/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c (revision e9f0878c4b2004ac19581274c1ae4c61ae3ca70e)
1 /* Hisilicon Hibmc SoC drm driver
2  *
3  * Based on the bochs drm driver.
4  *
5  * Copyright (c) 2016 Huawei Limited.
6  *
7  * Author:
8  *	Rongrong Zou <zourongrong@huawei.com>
9  *	Rongrong Zou <zourongrong@gmail.com>
10  *	Jianhua Li <lijianhua@huawei.com>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  */
18 
19 #include <drm/drm_atomic_helper.h>
20 #include <drm/drm_crtc_helper.h>
21 
22 #include "hibmc_drm_drv.h"
23 #include "hibmc_drm_regs.h"
24 
25 static int hibmc_connector_get_modes(struct drm_connector *connector)
26 {
27 	return drm_add_modes_noedid(connector, 800, 600);
28 }
29 
30 static enum drm_mode_status hibmc_connector_mode_valid(struct drm_connector *connector,
31 				      struct drm_display_mode *mode)
32 {
33 	return MODE_OK;
34 }
35 
36 static struct drm_encoder *
37 hibmc_connector_best_encoder(struct drm_connector *connector)
38 {
39 	return drm_encoder_find(connector->dev, NULL, connector->encoder_ids[0]);
40 }
41 
42 static const struct drm_connector_helper_funcs
43 	hibmc_connector_helper_funcs = {
44 	.get_modes = hibmc_connector_get_modes,
45 	.mode_valid = hibmc_connector_mode_valid,
46 	.best_encoder = hibmc_connector_best_encoder,
47 };
48 
49 static const struct drm_connector_funcs hibmc_connector_funcs = {
50 	.fill_modes = drm_helper_probe_single_connector_modes,
51 	.destroy = drm_connector_cleanup,
52 	.reset = drm_atomic_helper_connector_reset,
53 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
54 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
55 };
56 
57 static struct drm_connector *
58 hibmc_connector_init(struct hibmc_drm_private *priv)
59 {
60 	struct drm_device *dev = priv->dev;
61 	struct drm_connector *connector;
62 	int ret;
63 
64 	connector = devm_kzalloc(dev->dev, sizeof(*connector), GFP_KERNEL);
65 	if (!connector) {
66 		DRM_ERROR("failed to alloc memory when init connector\n");
67 		return ERR_PTR(-ENOMEM);
68 	}
69 
70 	ret = drm_connector_init(dev, connector,
71 				 &hibmc_connector_funcs,
72 				 DRM_MODE_CONNECTOR_VGA);
73 	if (ret) {
74 		DRM_ERROR("failed to init connector: %d\n", ret);
75 		return ERR_PTR(ret);
76 	}
77 	drm_connector_helper_add(connector,
78 				 &hibmc_connector_helper_funcs);
79 
80 	return connector;
81 }
82 
83 static void hibmc_encoder_mode_set(struct drm_encoder *encoder,
84 				   struct drm_display_mode *mode,
85 				   struct drm_display_mode *adj_mode)
86 {
87 	u32 reg;
88 	struct drm_device *dev = encoder->dev;
89 	struct hibmc_drm_private *priv = dev->dev_private;
90 
91 	reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
92 	reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1);
93 	reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1);
94 	reg |= HIBMC_DISPLAY_CONTROL_FPEN(1);
95 	reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1);
96 	writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
97 }
98 
99 static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = {
100 	.mode_set = hibmc_encoder_mode_set,
101 };
102 
103 static const struct drm_encoder_funcs hibmc_encoder_funcs = {
104 	.destroy = drm_encoder_cleanup,
105 };
106 
107 int hibmc_vdac_init(struct hibmc_drm_private *priv)
108 {
109 	struct drm_device *dev = priv->dev;
110 	struct drm_encoder *encoder;
111 	struct drm_connector *connector;
112 	int ret;
113 
114 	connector = hibmc_connector_init(priv);
115 	if (IS_ERR(connector)) {
116 		DRM_ERROR("failed to create connector: %ld\n",
117 			  PTR_ERR(connector));
118 		return PTR_ERR(connector);
119 	}
120 
121 	encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
122 	if (!encoder) {
123 		DRM_ERROR("failed to alloc memory when init encoder\n");
124 		return -ENOMEM;
125 	}
126 
127 	encoder->possible_crtcs = 0x1;
128 	ret = drm_encoder_init(dev, encoder, &hibmc_encoder_funcs,
129 			       DRM_MODE_ENCODER_DAC, NULL);
130 	if (ret) {
131 		DRM_ERROR("failed to init encoder: %d\n", ret);
132 		return ret;
133 	}
134 
135 	drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
136 	drm_connector_attach_encoder(connector, encoder);
137 
138 	return 0;
139 }
140