xref: /openbmc/linux/drivers/video/fbdev/via/vt1636.c (revision 64b70da0)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
4  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
5 
6  */
7 
8 #include <linux/via-core.h>
9 #include <linux/via_i2c.h>
10 #include "global.h"
11 
12 static const struct IODATA common_init_data[] = {
13 /*  Index, Mask, Value */
14 	/* Set panel power sequence timing */
15 	{0x10, 0xC0, 0x00},
16 	/* T1: VDD on - Data on. Each increment is 1 ms. (50ms = 031h) */
17 	{0x0B, 0xFF, 0x40},
18 	/* T2: Data on - Backlight on. Each increment is 2 ms. (210ms = 068h) */
19 	{0x0C, 0xFF, 0x31},
20 	/* T3: Backlight off -Data off. Each increment is 2 ms. (210ms = 068h)*/
21 	{0x0D, 0xFF, 0x31},
22 	/* T4: Data off - VDD off. Each increment is 1 ms. (50ms = 031h) */
23 	{0x0E, 0xFF, 0x68},
24 	/* T5: VDD off - VDD on. Each increment is 100 ms. (500ms = 04h) */
25 	{0x0F, 0xFF, 0x68},
26 	/* LVDS output power up */
27 	{0x09, 0xA0, 0xA0},
28 	/* turn on back light */
29 	{0x10, 0x33, 0x13}
30 };
31 
32 /* Index, Mask, Value */
33 static const struct IODATA dual_channel_enable_data = {0x08, 0xF0, 0xE0};
34 static const struct IODATA single_channel_enable_data = {0x08, 0xF0, 0x00};
35 static const struct IODATA dithering_enable_data = {0x0A, 0x70, 0x50};
36 static const struct IODATA dithering_disable_data = {0x0A, 0x70, 0x00};
37 static const struct IODATA vdd_on_data = {0x10, 0x20, 0x20};
38 static const struct IODATA vdd_off_data = {0x10, 0x20, 0x00};
39 
viafb_gpio_i2c_read_lvds(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info,u8 index)40 u8 viafb_gpio_i2c_read_lvds(struct lvds_setting_information
41 	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
42 	u8 index)
43 {
44 	u8 data;
45 
46 	viafb_i2c_readbyte(plvds_chip_info->i2c_port,
47 			   plvds_chip_info->lvds_chip_slave_addr, index, &data);
48 	return data;
49 }
50 
viafb_gpio_i2c_write_mask_lvds(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info,struct IODATA io_data)51 void viafb_gpio_i2c_write_mask_lvds(struct lvds_setting_information
52 			      *plvds_setting_info, struct lvds_chip_information
53 			      *plvds_chip_info, struct IODATA io_data)
54 {
55 	int index, data;
56 
57 	index = io_data.Index;
58 	data = viafb_gpio_i2c_read_lvds(plvds_setting_info, plvds_chip_info,
59 		index);
60 	data = (data & (~io_data.Mask)) | io_data.Data;
61 
62 	viafb_i2c_writebyte(plvds_chip_info->i2c_port,
63 			    plvds_chip_info->lvds_chip_slave_addr, index, data);
64 }
65 
viafb_init_lvds_vt1636(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)66 void viafb_init_lvds_vt1636(struct lvds_setting_information
67 	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info)
68 {
69 	int reg_num, i;
70 
71 	/* Common settings: */
72 	reg_num = ARRAY_SIZE(common_init_data);
73 	for (i = 0; i < reg_num; i++)
74 		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
75 			plvds_chip_info, common_init_data[i]);
76 
77 	/* Input Data Mode Select */
78 	if (plvds_setting_info->device_lcd_dualedge)
79 		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
80 			plvds_chip_info, dual_channel_enable_data);
81 	else
82 		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
83 			plvds_chip_info, single_channel_enable_data);
84 
85 	if (plvds_setting_info->LCDDithering)
86 		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
87 			plvds_chip_info, dithering_enable_data);
88 	else
89 		viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
90 			plvds_chip_info, dithering_disable_data);
91 }
92 
viafb_enable_lvds_vt1636(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)93 void viafb_enable_lvds_vt1636(struct lvds_setting_information
94 			*plvds_setting_info,
95 			struct lvds_chip_information *plvds_chip_info)
96 {
97 	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
98 		vdd_on_data);
99 }
100 
viafb_disable_lvds_vt1636(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)101 void viafb_disable_lvds_vt1636(struct lvds_setting_information
102 			 *plvds_setting_info,
103 			 struct lvds_chip_information *plvds_chip_info)
104 {
105 	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
106 		vdd_off_data);
107 }
108 
viafb_lvds_identify_vt1636(u8 i2c_adapter)109 bool viafb_lvds_identify_vt1636(u8 i2c_adapter)
110 {
111 	u8 Buffer[2];
112 
113 	DEBUG_MSG(KERN_INFO "viafb_lvds_identify_vt1636.\n");
114 
115 	/* Sense VT1636 LVDS Transmiter */
116 	viaparinfo->chip_info->lvds_chip_info.lvds_chip_slave_addr =
117 		VT1636_LVDS_I2C_ADDR;
118 
119 	/* Check vendor ID first: */
120 	if (viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR,
121 					0x00, &Buffer[0]))
122 		return false;
123 	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x01, &Buffer[1]);
124 
125 	if (!((Buffer[0] == 0x06) && (Buffer[1] == 0x11)))
126 		return false;
127 
128 	/* Check Chip ID: */
129 	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x02, &Buffer[0]);
130 	viafb_i2c_readbyte(i2c_adapter, VT1636_LVDS_I2C_ADDR, 0x03, &Buffer[1]);
131 	if ((Buffer[0] == 0x45) && (Buffer[1] == 0x33)) {
132 		viaparinfo->chip_info->lvds_chip_info.lvds_chip_name =
133 			VT1636_LVDS;
134 		return true;
135 	}
136 
137 	return false;
138 }
139 
get_clk_range_index(u32 Clk)140 static int get_clk_range_index(u32 Clk)
141 {
142 	if (Clk < DPA_CLK_30M)
143 		return DPA_CLK_RANGE_30M;
144 	else if (Clk < DPA_CLK_50M)
145 		return DPA_CLK_RANGE_30_50M;
146 	else if (Clk < DPA_CLK_70M)
147 		return DPA_CLK_RANGE_50_70M;
148 	else if (Clk < DPA_CLK_100M)
149 		return DPA_CLK_RANGE_70_100M;
150 	else if (Clk < DPA_CLK_150M)
151 		return DPA_CLK_RANGE_100_150M;
152 	else
153 		return DPA_CLK_RANGE_150M;
154 }
155 
set_dpa_vt1636(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info,struct VT1636_DPA_SETTING * p_vt1636_dpa_setting)156 static void set_dpa_vt1636(struct lvds_setting_information
157 	*plvds_setting_info, struct lvds_chip_information *plvds_chip_info,
158 		    struct VT1636_DPA_SETTING *p_vt1636_dpa_setting)
159 {
160 	struct IODATA io_data;
161 
162 	io_data.Index = 0x09;
163 	io_data.Mask = 0x1F;
164 	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST1;
165 	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info,
166 		plvds_chip_info, io_data);
167 
168 	io_data.Index = 0x08;
169 	io_data.Mask = 0x0F;
170 	io_data.Data = p_vt1636_dpa_setting->CLK_SEL_ST2;
171 	viafb_gpio_i2c_write_mask_lvds(plvds_setting_info, plvds_chip_info,
172 		io_data);
173 }
174 
viafb_vt1636_patch_skew_on_vt3324(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)175 void viafb_vt1636_patch_skew_on_vt3324(
176 	struct lvds_setting_information *plvds_setting_info,
177 	struct lvds_chip_information *plvds_chip_info)
178 {
179 	struct VT1636_DPA_SETTING dpa = {0x00, 0x00}, dpa_16x12 = {0x0B, 0x03},
180 		*pdpa;
181 	int index;
182 
183 	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3324.\n");
184 
185 	/* Graphics DPA settings: */
186 	index = get_clk_range_index(plvds_setting_info->vclk);
187 	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
188 		    &GFX_DPA_SETTING_TBL_VT3324[index]);
189 
190 	/* LVDS Transmitter DPA settings: */
191 	if (plvds_setting_info->lcd_panel_hres == 1600 &&
192 		plvds_setting_info->lcd_panel_vres == 1200)
193 		pdpa = &dpa_16x12;
194 	else
195 		pdpa = &dpa;
196 
197 	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, pdpa);
198 }
199 
viafb_vt1636_patch_skew_on_vt3327(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)200 void viafb_vt1636_patch_skew_on_vt3327(
201 	struct lvds_setting_information *plvds_setting_info,
202 	struct lvds_chip_information *plvds_chip_info)
203 {
204 	struct VT1636_DPA_SETTING dpa = {0x00, 0x00};
205 	int index;
206 
207 	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3327.\n");
208 
209 	/* Graphics DPA settings: */
210 	index = get_clk_range_index(plvds_setting_info->vclk);
211 	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
212 		    &GFX_DPA_SETTING_TBL_VT3327[index]);
213 
214 	/* LVDS Transmitter DPA settings: */
215 	set_dpa_vt1636(plvds_setting_info, plvds_chip_info, &dpa);
216 }
217 
viafb_vt1636_patch_skew_on_vt3364(struct lvds_setting_information * plvds_setting_info,struct lvds_chip_information * plvds_chip_info)218 void viafb_vt1636_patch_skew_on_vt3364(
219 	struct lvds_setting_information *plvds_setting_info,
220 	struct lvds_chip_information *plvds_chip_info)
221 {
222 	int index;
223 
224 	DEBUG_MSG(KERN_INFO "viafb_vt1636_patch_skew_on_vt3364.\n");
225 
226 	/* Graphics DPA settings: */
227 	index = get_clk_range_index(plvds_setting_info->vclk);
228 	viafb_set_dpa_gfx(plvds_chip_info->output_interface,
229 		    &GFX_DPA_SETTING_TBL_VT3364[index]);
230 }
231