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 <linux/io.h>
15
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_probe_helper.h>
18 #include <drm/drm_print.h>
19 #include <drm/drm_simple_kms_helper.h>
20
21 #include "hibmc_drm_drv.h"
22 #include "hibmc_drm_regs.h"
23
hibmc_connector_get_modes(struct drm_connector * connector)24 static int hibmc_connector_get_modes(struct drm_connector *connector)
25 {
26 int count;
27 void *edid;
28 struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
29
30 edid = drm_get_edid(connector, &hibmc_connector->adapter);
31 if (edid) {
32 drm_connector_update_edid_property(connector, edid);
33 count = drm_add_edid_modes(connector, edid);
34 if (count)
35 goto out;
36 }
37
38 count = drm_add_modes_noedid(connector,
39 connector->dev->mode_config.max_width,
40 connector->dev->mode_config.max_height);
41 drm_set_preferred_mode(connector, 1024, 768);
42
43 out:
44 kfree(edid);
45 return count;
46 }
47
hibmc_connector_destroy(struct drm_connector * connector)48 static void hibmc_connector_destroy(struct drm_connector *connector)
49 {
50 struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
51
52 i2c_del_adapter(&hibmc_connector->adapter);
53 drm_connector_cleanup(connector);
54 }
55
56 static const struct drm_connector_helper_funcs
57 hibmc_connector_helper_funcs = {
58 .get_modes = hibmc_connector_get_modes,
59 };
60
61 static const struct drm_connector_funcs hibmc_connector_funcs = {
62 .fill_modes = drm_helper_probe_single_connector_modes,
63 .destroy = hibmc_connector_destroy,
64 .reset = drm_atomic_helper_connector_reset,
65 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
66 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
67 };
68
hibmc_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adj_mode)69 static void hibmc_encoder_mode_set(struct drm_encoder *encoder,
70 struct drm_display_mode *mode,
71 struct drm_display_mode *adj_mode)
72 {
73 u32 reg;
74 struct drm_device *dev = encoder->dev;
75 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
76
77 reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
78 reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1);
79 reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1);
80 reg |= HIBMC_DISPLAY_CONTROL_FPEN(1);
81 reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1);
82 writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
83 }
84
85 static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = {
86 .mode_set = hibmc_encoder_mode_set,
87 };
88
hibmc_vdac_init(struct hibmc_drm_private * priv)89 int hibmc_vdac_init(struct hibmc_drm_private *priv)
90 {
91 struct drm_device *dev = &priv->dev;
92 struct hibmc_connector *hibmc_connector = &priv->connector;
93 struct drm_encoder *encoder = &priv->encoder;
94 struct drm_crtc *crtc = &priv->crtc;
95 struct drm_connector *connector = &hibmc_connector->base;
96 int ret;
97
98 ret = hibmc_ddc_create(dev, hibmc_connector);
99 if (ret) {
100 drm_err(dev, "failed to create ddc: %d\n", ret);
101 return ret;
102 }
103
104 encoder->possible_crtcs = drm_crtc_mask(crtc);
105 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
106 if (ret) {
107 drm_err(dev, "failed to init encoder: %d\n", ret);
108 return ret;
109 }
110
111 drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
112
113 ret = drm_connector_init_with_ddc(dev, connector,
114 &hibmc_connector_funcs,
115 DRM_MODE_CONNECTOR_VGA,
116 &hibmc_connector->adapter);
117 if (ret) {
118 drm_err(dev, "failed to init connector: %d\n", ret);
119 return ret;
120 }
121
122 drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);
123
124 drm_connector_attach_encoder(connector, encoder);
125
126 return 0;
127 }
128