1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Hisilicon Hibmc SoC drm driver
3 *
4 * Based on the bochs drm driver.
5 *
6 * Copyright (c) 2016 Huawei Limited.
7 *
8 * Author:
9 * Rongrong Zou <zourongrong@huawei.com>
10 * Rongrong Zou <zourongrong@gmail.com>
11 * Jianhua Li <lijianhua@huawei.com>
12 */
13
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_probe_helper.h>
16 #include <drm/drm_print.h>
17 #include <drm/drm_simple_kms_helper.h>
18
19 #include "hibmc_drm_drv.h"
20 #include "hibmc_drm_regs.h"
21
hibmc_connector_get_modes(struct drm_connector * connector)22 static int hibmc_connector_get_modes(struct drm_connector *connector)
23 {
24 int count;
25 void *edid;
26 struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
27
28 edid = drm_get_edid(connector, &hibmc_connector->adapter);
29 if (edid) {
30 drm_connector_update_edid_property(connector, edid);
31 count = drm_add_edid_modes(connector, edid);
32 if (count)
33 goto out;
34 }
35
36 count = drm_add_modes_noedid(connector,
37 connector->dev->mode_config.max_width,
38 connector->dev->mode_config.max_height);
39 drm_set_preferred_mode(connector, 1024, 768);
40
41 out:
42 kfree(edid);
43 return count;
44 }
45
hibmc_connector_destroy(struct drm_connector * connector)46 static void hibmc_connector_destroy(struct drm_connector *connector)
47 {
48 struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
49
50 i2c_del_adapter(&hibmc_connector->adapter);
51 drm_connector_cleanup(connector);
52 }
53
54 static const struct drm_connector_helper_funcs
55 hibmc_connector_helper_funcs = {
56 .get_modes = hibmc_connector_get_modes,
57 };
58
59 static const struct drm_connector_funcs hibmc_connector_funcs = {
60 .fill_modes = drm_helper_probe_single_connector_modes,
61 .destroy = hibmc_connector_destroy,
62 .reset = drm_atomic_helper_connector_reset,
63 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
64 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
65 };
66
hibmc_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adj_mode)67 static void hibmc_encoder_mode_set(struct drm_encoder *encoder,
68 struct drm_display_mode *mode,
69 struct drm_display_mode *adj_mode)
70 {
71 u32 reg;
72 struct drm_device *dev = encoder->dev;
73 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
74
75 reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
76 reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1);
77 reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1);
78 reg |= HIBMC_DISPLAY_CONTROL_FPEN(1);
79 reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1);
80 writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
81 }
82
83 static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = {
84 .mode_set = hibmc_encoder_mode_set,
85 };
86
hibmc_vdac_init(struct hibmc_drm_private * priv)87 int hibmc_vdac_init(struct hibmc_drm_private *priv)
88 {
89 struct drm_device *dev = &priv->dev;
90 struct hibmc_connector *hibmc_connector = &priv->connector;
91 struct drm_encoder *encoder = &priv->encoder;
92 struct drm_crtc *crtc = &priv->crtc;
93 struct drm_connector *connector = &hibmc_connector->base;
94 int ret;
95
96 ret = hibmc_ddc_create(dev, hibmc_connector);
97 if (ret) {
98 drm_err(dev, "failed to create ddc: %d\n", ret);
99 return ret;
100 }
101
102 encoder->possible_crtcs = drm_crtc_mask(crtc);
103 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
104 if (ret) {
105 drm_err(dev, "failed to init encoder: %d\n", ret);
106 return ret;
107 }
108
109 drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
110
111 ret = drm_connector_init_with_ddc(dev, connector,
112 &hibmc_connector_funcs,
113 DRM_MODE_CONNECTOR_VGA,
114 &hibmc_connector->adapter);
115 if (ret) {
116 drm_err(dev, "failed to init connector: %d\n", ret);
117 return ret;
118 }
119
120 drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);
121
122 drm_connector_attach_encoder(connector, encoder);
123
124 return 0;
125 }
126