1 /*
2  * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <clk.h>
9 #include <display.h>
10 #include <dm.h>
11 #include <dw_hdmi.h>
12 #include <edid.h>
13 #include <regmap.h>
14 #include <syscon.h>
15 #include <asm/gpio.h>
16 #include <asm/io.h>
17 #include <asm/arch/clock.h>
18 #include <asm/arch/hardware.h>
19 #include <asm/arch/grf_rk3288.h>
20 #include <power/regulator.h>
21 #include "rk_hdmi.h"
22 
23 static int rk3288_hdmi_enable(struct udevice *dev, int panel_bpp,
24 			      const struct display_timing *edid)
25 {
26 	struct rk_hdmi_priv *priv = dev_get_priv(dev);
27 	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
28 	int vop_id = uc_plat->source_id;
29 	struct rk3288_grf *grf = priv->grf;
30 
31 	/* hdmi source select hdmi controller */
32 	rk_setreg(&grf->soc_con6, 1 << 15);
33 
34 	/* hdmi data from vop id */
35 	rk_clrsetreg(&grf->soc_con6, 1 << 4, (vop_id == 1) ? (1 << 4) : 0);
36 
37 	return 0;
38 }
39 
40 static int rk3288_hdmi_ofdata_to_platdata(struct udevice *dev)
41 {
42 	struct rk_hdmi_priv *priv = dev_get_priv(dev);
43 	struct dw_hdmi *hdmi = &priv->hdmi;
44 
45 	hdmi->i2c_clk_high = 0x7a;
46 	hdmi->i2c_clk_low = 0x8d;
47 
48 	/*
49 	 * TODO(sjg@chromium.org): The above values don't work - these
50 	 * ones work better, but generate lots of errors in the data.
51 	 */
52 	hdmi->i2c_clk_high = 0x0d;
53 	hdmi->i2c_clk_low = 0x0d;
54 
55 	return rk_hdmi_ofdata_to_platdata(dev);
56 }
57 
58 static int rk3288_clk_config(struct udevice *dev)
59 {
60 	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
61 	struct clk clk;
62 	int ret;
63 
64 	/*
65 	 * Configure the maximum clock to permit whatever resolution the
66 	 * monitor wants
67 	 */
68 	ret = clk_get_by_index(uc_plat->src_dev, 0, &clk);
69 	if (ret >= 0) {
70 		ret = clk_set_rate(&clk, 384000000);
71 		clk_free(&clk);
72 	}
73 	if (ret < 0) {
74 		debug("%s: Failed to set clock in source device '%s': ret=%d\n",
75 		      __func__, uc_plat->src_dev->name, ret);
76 		return ret;
77 	}
78 
79 	return 0;
80 }
81 
82 static const char * const rk3288_regulator_names[] = {
83 	"vcc50_hdmi"
84 };
85 
86 static int rk3288_hdmi_probe(struct udevice *dev)
87 {
88 	/* Enable VOP clock for RK3288 */
89 	rk3288_clk_config(dev);
90 
91 	/* Enable regulators required for HDMI */
92 	rk_hdmi_probe_regulators(dev, rk3288_regulator_names,
93 				 ARRAY_SIZE(rk3288_regulator_names));
94 
95 	return rk_hdmi_probe(dev);
96 }
97 
98 static const struct dm_display_ops rk3288_hdmi_ops = {
99 	.read_edid = rk_hdmi_read_edid,
100 	.enable = rk3288_hdmi_enable,
101 };
102 
103 static const struct udevice_id rk3288_hdmi_ids[] = {
104 	{ .compatible = "rockchip,rk3288-dw-hdmi" },
105 	{ }
106 };
107 
108 U_BOOT_DRIVER(rk3288_hdmi_rockchip) = {
109 	.name = "rk3288_hdmi_rockchip",
110 	.id = UCLASS_DISPLAY,
111 	.of_match = rk3288_hdmi_ids,
112 	.ops = &rk3288_hdmi_ops,
113 	.ofdata_to_platdata = rk3288_hdmi_ofdata_to_platdata,
114 	.probe = rk3288_hdmi_probe,
115 	.priv_auto_alloc_size = sizeof(struct rk_hdmi_priv),
116 };
117