參考MTK 文檔LCM_Customer_document_MT6575.pdf

The following shows the steps to add a new LCM driver:?

(1)? Create LCM driver folder $LCM in alps/mediatek/custom/common/kernel/lcm/

(2)? Create LCM driver source file $LCM.c in alps/mediatek/custom/common/kernel/lcm/$LCM

(3)? Implement LCM driver and export lcm_driver_list/lcm_count variables.?

????????????????????

Adaptive LCM Support?
At first you should add you new lcm driver as listed in the previous section, and then add the?
adaptive support:?
1.? Modify the adaptive lcm driver common file:??
alps/mediatek/custom/common/kernel/lcm/mt65xx_lcm_list.c

2.? Add the new LCM driver global variables as shown in the figure below:?

????????????????

3.? [VERY IMPORTANT] Please delete the unused LCM driver folder in the customization folder,?
such as shown in the figure below:?

??????????????

4. But what if I didn’t delete the folders un-usable? The code size will increase, because the?
other LCM drivers will be compiled into codebase too; And if your project doesn’t define?
GPIO usage for serial interface, there will be build error.

5.? Modify the project makefile alps/mediate/config/(project)/ProjetConfig.mk?
Modify CUSTOM_KERNEL_LCM=mt65xx?
Modify CUSTOM_UBOOT_LCM=mt65xx

Case Study – DBI Interface LCM Driver Porting?

In this chapter, we’ll go through a real case study of DBI LCM driver porting.?

LCM specifications:?
?? LCM Drive IC: hx8369?
?? Interface: 24-bit 80 system bus interface?
?? LCD size: 480*800?
??
1.? Create LCM driver folder and LCM driver source file?
alps/mediatek/custom/common/kernel/lcm/hx8369/lcm_dr.c?

2.? Modify the project makefile alps/mtk/make/$(project).mak?
Add CUSTOM_KERNEL_LCM= hx8369?
Add CUSTOM_UBOOT_LCM= hx8369?

3.? Fill the LCM parameters?
A.? Configure the basic information according to the HW connection, LCM type and LCM size:?

?????????????????

MT6575 LCD IO selection is as shown in following table. LCD data pin can share between DPI and NAND data pin?

????????????

For example, we use 24bits DBI interface LCM, and connect LCM data pin to MT6575 baseband?
Pin DPIR[7:0], DPIG[7:0], DPIB[7:0]. So we must set io_select_mode to be 1; if connect LCM data?
pin to Nand IF, we must set io_select_mode to be 0

B.? Configure data format according to the RGB data pin assignment of the LCM datasheet?

????????????

C.? Configure LCM waveform timing according to the requirement specified in the LCM datasheet

??????????????

Note: MT6575 LCD controller clock frequency is 130MHz, so clock cycle time is 1/130MHz = 7.69ns

4.? Implement LCM init function?

According the init process specified in LCM datasheet, pull down/up the reset pin, delay and set?
LCM init register settings.?

5.? Implement LCM update function?
Send the block update commands to LCM?

6.? Implement LCM suspend/resume functions?
Send suspend/resume commands to LCM

7. Rebuild uboot and kernel?
In the root directory:?
./mk $(project) gen_cust?
./mk $(project) remake uboot/kernel?
./mk $(project) bootimage?

參考代碼：

[cpp]?view plaincopy

/*****************************************************************************

*? Copyright Statement:

*? --------------------

*? This software is protected by Copyright and the information contained

*? herein is confidential. The software may not be copied and the information

*? contained herein may not be used or disclosed except with the written

*? permission of MediaTek Inc. (C) 2008

*

*? BY OPENING THIS FILE, BUYER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES

*? THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")

*? RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO BUYER ON

*? AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,

*? EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF

*? MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.

*? NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE

*? SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR

*? SUPPLIED WITH THE MEDIATEK SOFTWARE, AND BUYER AGREES TO LOOK ONLY TO SUCH

*? THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. MEDIATEK SHALL ALSO

*? NOT BE RESPONSIBLE FOR ANY MEDIATEK SOFTWARE RELEASES MADE TO BUYER'S

*? SPECIFICATION OR TO CONFORM TO A PARTICULAR STANDARD OR OPEN FORUM.

*

*? BUYER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND CUMULATIVE

*? LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,

*? AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,

*? OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY BUYER TO

*? MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE.

*

*? THE TRANSACTION CONTEMPLATED HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE

*? WITH THE LAWS OF THE STATE OF CALIFORNIA, USA, EXCLUDING ITS CONFLICT OF

*? LAWS PRINCIPLES.? ANY DISPUTES, CONTROVERSIES OR CLAIMS ARISING THEREOF AND

*? RELATED THERETO SHALL BE SETTLED BY ARBITRATION IN SAN FRANCISCO, CA, UNDER

*? THE RULES OF THE INTERNATIONAL CHAMBER OF COMMERCE (ICC).

*

*****************************************************************************/?

?

#include <linux/string.h>?

?

#include "lcm_drv.h"?

?

//#include <linux/kernel.h> //for printk()?

?

//extern void printf(const char* fmt, ...);?

?

#ifdef BUILD_UBOOT?

#include <asm/arch/mt6575_gpio.h>?

#define print(x...) printf(x)?

#else?

#include <mach/mt6575_gpio.h>?

#define print(x...) printk(x)?

#endif?

?

?

//libin modify for M1-4 on 20120726?

#define GPIO_LCD_RST?? 18 //GPIO18?

#define? GPIO_MODE_00? 0?

#define GPIO_DIR_OUT?? 1?

#define GPIO_OUT_ONE? 1?

#define GPIO_OUT_ZERO? 0?

extern?s32 mt_set_gpio_mode(u32 u4Pin, u32 u4Mode);?

extern?s32 mt_set_gpio_out(u32 u4Pin, u32 u4PinOut);?

extern?s32 mt_set_gpio_dir(u32 u4Pin, u32 u4Dir);?

?

// ---------------------------------------------------------------------------?

//? Local Constants?

// ---------------------------------------------------------------------------?

?

#define FRAME_WIDTH? (320)?

#define FRAME_HEIGHT (480)?

?

// ---------------------------------------------------------------------------?

//? Local Variables?

// ---------------------------------------------------------------------------?

?

static?LCM_UTIL_FUNCS lcm_util = {0};?

?

#define SET_RESET_PIN(v)??? (lcm_util.set_reset_pin((v)))?

?

#define UDELAY(n) (lcm_util.udelay(n))?

#define MDELAY(n) (lcm_util.mdelay(n))?

?

?

// ---------------------------------------------------------------------------?

//? Local Functions?

// ---------------------------------------------------------------------------?

?

static?__inline unsigned?int?HIGH_BYTE(unsigned?int?val)?

{?

????return?(val >> 8) & 0xFF;?

}?

?

static?__inline unsigned?int?LOW_BYTE(unsigned?int?val)?

{?

????return?(val & 0xFF);?

}?

?

static?__inline?void?send_ctrl_cmd(unsigned?int?cmd)?

{?

//MDELAY(5);?

//mt_set_gpio_out(16, GPIO_OUT_ZERO);?????

??? lcm_util.send_cmd(cmd);?

//? mt_set_gpio_out(16, GPIO_OUT_ONE);??

}?

?

static?__inline?void?send_data_cmd(unsigned?int?data)?

{?

//MDELAY(5);?

//mt_set_gpio_out(16, GPIO_OUT_ZERO);?????

??? lcm_util.send_data(data);?

//? mt_set_gpio_out(16, GPIO_OUT_ONE);??

}?

?

static?__inline unsigned?int?read_data_cmd()?

{?

????return?lcm_util.read_data();?

}?

?

static?__inline?void?set_lcm_register(unsigned?int?regIndex,?

????????????????????????????????????? unsigned?int?regData)?

{?

??? send_ctrl_cmd(regIndex);?

??? send_data_cmd(regData);?

}?

?

?

static?void?init_lcm_registers(void)?

{?

send_ctrl_cmd(0xF1);?

send_data_cmd(0x36);??

send_data_cmd(0x04);??

send_data_cmd(0x00);??

send_data_cmd(0x3C);?

send_data_cmd(0x0F);?

send_data_cmd(0x8F);?

?

send_ctrl_cmd(0xf2);?

send_data_cmd(0x18);??

send_data_cmd(0xa3);??

send_data_cmd(0x12);??

send_data_cmd(0x02);??

send_data_cmd(0xb2);??

send_data_cmd(0x12);??

send_data_cmd(0xff);??

send_data_cmd(0x10);??

send_data_cmd(0x00);??

?

send_ctrl_cmd(0xf8);??

send_data_cmd(0x21);??

send_data_cmd(0x04);??

?

send_ctrl_cmd(0xf9);??

send_data_cmd(0x00);??

send_data_cmd(0x08);??

?

send_ctrl_cmd(0xC0);??

send_data_cmd(0x0F);??

send_data_cmd(0x0F);??

?

send_ctrl_cmd(0xc1);??

send_data_cmd(0x42);??

?

send_ctrl_cmd(0xC2);??

send_data_cmd(0x22);??

?

send_ctrl_cmd(0xc5);??

send_data_cmd(0x00);??

send_data_cmd(0x08);??

send_data_cmd(0x80);??

?

send_ctrl_cmd(0xb1);??

send_data_cmd(0xB0);??

send_data_cmd(0x11);??

?

send_ctrl_cmd(0xb4);??

send_data_cmd(0x02);??

?

send_ctrl_cmd(0xb6);??

send_data_cmd(0x02);??

send_data_cmd(0x02);?//cpu?02?

?

send_ctrl_cmd(0xb7);??

send_data_cmd(0xC6);??

?

send_ctrl_cmd(0x3a);??

send_data_cmd(0x66/*0x55*/);//16bit ?55? 18bit? ?66?

?

send_ctrl_cmd(0x35);??

send_data_cmd(0x00);??

?

send_ctrl_cmd(0x44);??

send_data_cmd(0x00);?

send_data_cmd(0x5f);?

?

send_ctrl_cmd(0x36);??

send_data_cmd(0x08);?// 0xc8?

?

send_ctrl_cmd(0x2a);??

send_data_cmd(0x00);?

send_data_cmd(0x00);?

send_data_cmd(0x01);??

send_data_cmd(0x3f);?

?

send_ctrl_cmd(0x2b);?

send_data_cmd(0x00);??

send_data_cmd(0x00);??

send_data_cmd(0x01);??

send_data_cmd(0xdf);??

?

send_ctrl_cmd(0xe0);??

send_data_cmd(0x00);??

send_data_cmd(0x1D);??

send_data_cmd(0x19);??

send_data_cmd(0x0c);??

send_data_cmd(0x0f);??

send_data_cmd(0x0A);??????????

send_data_cmd(0x45);??

send_data_cmd(0x95);??

send_data_cmd(0x38);??

send_data_cmd(0x0a);??

send_data_cmd(0x12);?

send_data_cmd(0x03);??

send_data_cmd(0x09);??

send_data_cmd(0x06);??

send_data_cmd(0x00);??

?

send_ctrl_cmd(0xe1);??

send_data_cmd(0x0f);??

send_data_cmd(0x37);??

send_data_cmd(0x35);??

send_data_cmd(0x0C);??

send_data_cmd(0x0d);??

send_data_cmd(0x04);??

send_data_cmd(0x48);??

send_data_cmd(0x43);??

send_data_cmd(0x35);??

send_data_cmd(0x04);??

send_data_cmd(0x0D);??

send_data_cmd(0x02);??

send_data_cmd(0x1C);??

send_data_cmd(0x18);??

send_data_cmd(0x0F);??

?

send_ctrl_cmd(0x11);?

MDELAY(120);??

send_ctrl_cmd(0x29);??

send_ctrl_cmd(0x2c);??

MDELAY(10);??

}?

?

?

// ---------------------------------------------------------------------------?

//? LCM Driver Implementations?

// ---------------------------------------------------------------------------?

?

static?void?lcm_set_util_funcs(const?LCM_UTIL_FUNCS *util)?

{?

??? memcpy(&lcm_util, util,?sizeof(LCM_UTIL_FUNCS));?

}?

?

?

static?void?lcm_get_params(LCM_PARAMS *params)?

{?

??? memset(params, 0,?sizeof(LCM_PARAMS));?

?

??? params->type?? = LCM_TYPE_DBI;?

??? params->ctrl?? = LCM_CTRL_PARALLEL_DBI;?

??? params->width? = FRAME_WIDTH;?

??? params->height = FRAME_HEIGHT;?

??? params->io_select_mode = 1;?

?

??? params->dbi.port??????????????????? = 0;?// 1;?

???//params->dbi.clock_freq????????????? = LCM_DBI_CLOCK_FREQ_104M;? //aa?

??? params->dbi.data_width????????????? = LCM_DBI_DATA_WIDTH_18BITS;//LCM_DBI_DATA_WIDTH_16BITS;?

??? params->dbi.data_format.color_order = LCM_COLOR_ORDER_RGB;?

??? params->dbi.data_format.trans_seq?? = LCM_DBI_TRANS_SEQ_MSB_FIRST;?

??? params->dbi.data_format.padding???? = LCM_DBI_PADDING_ON_LSB;?//LCM_DBI_PADDING_ON_LSB; //bb?

??? params->dbi.data_format.format????? = LCM_DBI_FORMAT_RGB666;?//LCM_DBI_FORMAT_RGB565;?

??? params->dbi.data_format.width?????? = LCM_DBI_DATA_WIDTH_18BITS;?//LCM_DBI_DATA_WIDTH_16BITS;?

??? params->dbi.cpu_write_bits????????? = LCM_DBI_CPU_WRITE_32_BITS;?//LCM_DBI_CPU_WRITE_16_BITS;?

??? params->dbi.io_driving_current????? = LCM_DRIVING_CURRENT_6575_8MA ;??// 0;?

?

??/* params->dbi.parallel.write_setup??? = 1;

??? params->dbi.parallel.write_hold???? = 1;

??? params->dbi.parallel.write_wait???? = 9; // 3;

??? params->dbi.parallel.read_setup???? = 1;

??? params->dbi.parallel.read_latency?? = 31;

??? params->dbi.parallel.wait_period??? = 2;*/?

?

??? params->dbi.parallel.write_setup??? = 2;??

??? params->dbi.parallel.write_hold???? = 2;??

??? params->dbi.parallel.write_wait???? = 15;??

??? params->dbi.parallel.read_setup???? = 1;??

??? params->dbi.parallel.read_latency?? = 31;??

??? params->dbi.parallel.wait_period??? = 2;??

???? params->dbi.parallel.cs_high_width = 0;?

?

?

????// enable tearing-free?

??//? params->dbi.te_mode???????????????? = LCM_DBI_TE_MODE_VSYNC_ONLY;?

???// params->dbi.te_edge_polarity??????? = LCM_POLARITY_FALLING;?

?????

???/* params->dbi.te_mode???????????????? = LCM_DBI_TE_MODE_VSYNC_OR_HSYNC;

??? params->dbi.te_edge_polarity??????? = LCM_POLARITY_RISING;

??? params->dbi.te_hs_delay_cnt???????? = 50;

??? params->dbi.te_vs_width_cnt???????? = 277;

??? params->dbi.te_vs_width_cnt_div???? = LCM_DBI_TE_VS_WIDTH_CNT_DIV_16;*/?

?

?

}?

?

#define GPIO_LCD_RST?? 18 //GPIO18?

#define? GPIO_MODE_00? 0?

#define GPIO_DIR_OUT?? 1?

#define GPIO_OUT_ONE? 1?

#define GPIO_OUT_ZERO? 0?

extern?s32 mt_set_gpio_mode(u32 u4Pin, u32 u4Mode);?

extern?s32 mt_set_gpio_out(u32 u4Pin, u32 u4PinOut);?

extern?s32 mt_set_gpio_dir(u32 u4Pin, u32 u4Dir);?

static?void?lcm_init(void)?

{?

???/* SET_RESET_PIN(0);

??? MDELAY(200);

??? SET_RESET_PIN(1);

??? MDELAY(400);*/?

?????

?????// SET_RESET_PIN(1);?????

?? mt_set_gpio_mode(GPIO_LCD_RST,GPIO_MODE_00);?

?? mt_set_gpio_dir(GPIO_LCD_RST,GPIO_DIR_OUT);?

?? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);?

??? MDELAY(1);??

????//SET_RESET_PIN(0);??

??? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ZERO);?

??? MDELAY(10);??

????//SET_RESET_PIN(1);??

??? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);?

??? MDELAY(100);??

?

?

??? init_lcm_registers();?

}?

?

?

static?void?lcm_suspend(void)?

{?

??? send_ctrl_cmd(0x28);?

??? MDELAY(20);??

send_ctrl_cmd(0x10);??

MDELAY(100);??

}?

?

?

static?void?lcm_resume(void)?

{?

send_ctrl_cmd(0x11);??

MDELAY(100);??

send_ctrl_cmd(0x29);?

//MDELAY(100);??

/*

??? send_ctrl_cmd(0x29);

??? MDELAY(120);

send_ctrl_cmd(0x11);

MDELAY(120); */?

}?

?

?

static?void?lcm_update(unsigned?int?x, unsigned?int?y,?

?????????????????????? unsigned?int?width, unsigned?int?height)?

{?

??? unsigned?int?x0 = x;?

??? unsigned?int?y0 = y;?

??? unsigned?int?x1 = x0 + width - 1;?

??? unsigned?int?y1 = y0 + height - 1;?

?

print(?"[LCM] *********************ili9486 lcm_update*******************\n\r");?

??

??? send_ctrl_cmd(0x2A);?

??? send_data_cmd(HIGH_BYTE(x0));?

??? send_data_cmd(LOW_BYTE(x0));?

??? send_data_cmd(HIGH_BYTE(x1));?

??? send_data_cmd(LOW_BYTE(x1));?

?

??? send_ctrl_cmd(0x2B);?

??? send_data_cmd(HIGH_BYTE(y0));?

??? send_data_cmd(LOW_BYTE(y0));?

??? send_data_cmd(HIGH_BYTE(y1));?

??? send_data_cmd(LOW_BYTE(y1));?

?

????// Write To GRAM?

??? send_ctrl_cmd(0x2C);?

}?

?

static?unsigned?int?lcm_compare_id(void)?

{?

????return?1;?

}?

// ---------------------------------------------------------------------------?

//? Get LCM Driver Hooks?

// ---------------------------------------------------------------------------?

LCM_DRIVER ili9486_lcm_drv =??

{?

??? .name?????????? =?"ili9486",?

??? .set_util_funcs = lcm_set_util_funcs,?

??? .get_params???? = lcm_get_params,?

??? .init?????????? = lcm_init,?

??? .suspend??????? = lcm_suspend,?

??? .resume???????? = lcm_resume,?

??? .update???????? = lcm_update,?

??? .compare_id???? = lcm_compare_id?

};

注意事項：

1.調試屏幕主要的工作是初始化和時序設置

2.編譯的時候，僅僅使用./mk r ub k 是不夠的，還需要運行./mk bootimage命令

3.可能是更改了gpio口中LRSTB的原因導致reset失敗，代碼中通過以下代碼手動設置reset信號

[cpp]?view plaincopy

static?void?lcm_init(void)?

{??

?????????// SET_RESET_PIN(1);?????

?? mt_set_gpio_mode(GPIO_LCD_RST,GPIO_MODE_00);?

?? mt_set_gpio_dir(GPIO_LCD_RST,GPIO_DIR_OUT);?

?? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);?

??? MDELAY(1);??

????//SET_RESET_PIN(0);??

??? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ZERO);?

??? MDELAY(10);??

????//SET_RESET_PIN(1);??

??? mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);?

??? MDELAY(100);??

?

...?

}?

總結

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