高通平台mipi panel kernel读包方法

熟悉高通平台mipi panel kernel读包方法，我想我们可以是的同一客户要是使用2块mipi panel的话我想我们可以通过读取id来下不同序列而不用更换boot.img，还有能否读id可以说明mipi通讯是否正常。

还有我们只需在lk下面读一次id再对全局变量赋值通过lk传递到kernel里面，通过不同赋值发送不同初始化序列，至于时序clk则调整好兼容2块屏的，也可以通过全局变量来区分。

在mipi_xxx.c中加入下面函数即可，很好用的！关键时候起作用。注意所读的寄存器必须是可读的，之前好几次读失败了原因就是这个。

static u32 mipi_truely_read_reg(struct msm_fb_data_type *mfd, u16 reg)
{

u32 data;

int len = 4;

struct dsi_cmd_desc cmd_read_reg =
{

DTYPE_GEN_READ2, 1, 0, 1, 0, /* cmd 0x24 */

sizeof(reg), (char *) ®};

mipi_dsi_buf_init(&truly_tx_buf);

mipi_dsi_buf_init(&truly_rx_buf);

/* mutex had been acquried at dsi_on */

len = mipi_dsi_cmds_rx(mfd, &truly_tx_buf, &truly_rx_buf,

&cmd_read_reg, len);

data = *(u32 *)truly_rx_buf.data;

if (len != 4)

printk("%s: invalid rlen=%d, expecting 4.\n", __func__, len);

printk("%s: reg=0x%x.data=0x%08x.\n", __func__, reg, data);

return data;

}

static int mipi_truly_lcd_on(struct platform_device *pdev)

{

struct msm_fb_data_type *mfd;

u32 data;

mfd = platform_get_drvdata(pdev);

if (!mfd)

return -ENODEV;

if (mfd->key != MFD_KEY)

return -EINVAL;

if (display_n) {

if (mipi_truly_lcd_reset() < 0) {

pr_err("mipi_truly_lcd_reset error\n");

return -EINVAL;

}

msleep(20);

mipi_dsi_cmds_tx(mfd, &truly_tx_buf,

truly_video_display_on_cmds,ARRAY_SIZE(truly_video_display_on_cmds));

printk("mipi_dsi_cmds_tx called here");

mdelay(20);

//add for testdata=mipi_truely_read_reg(mfd,0xE1);

printk("data =0x%x",data);

}



display_n = TRUE;



return 0;

}

static char A13[5]={0xC1,0x17,0x30,0x0E,0x26};

static char A14[2]={0x5e,0x55};

static char

A15[17]={0xE1,0x00,0x0B,0x14,0x13,0x13,0x1F,0x0D,0x0B,0x00,0x04,0x00,0x11,0x0C,0x1C,0x17,0x00};



log:

<4>[ 5.672508] [(1980-01-06 05:56:05.862078335 UTC)]

mipi_truely_read_reg: reg=0xc1.data=0x260e3017.

<4>[ 5.672588] [(1980-01-06 05:56:05.862156668 UTC)]

mipi_truely_read_reg: reg=0x5f.data=0x00000055.

<4>[ 5.672733] [(1980-01-06 05:56:05.862301668 UTC)]

mipi_truely_read_reg: reg=0xe1.data=0x13140b00.

还有一个函数也可以写法不一样而已：



static struct dsi_cmd_desc novatek_manufacture_id_cmd = {

DTYPE_DCS_READ, 1, 0, 1, 5, sizeof(a10), a10};

static uint32 mipi_novatek_manufacture_id(struct msm_fb_data_type *mfd)

{

struct dsi_buf *rp, *tp;

struct dsi_cmd_desc *cmd;

uint32 *lp;

tp = &ili_tx_buf;

rp = &ili_rx_buf;

cmd = &novatek_manufacture_id_cmd;

mipi_dsi_cmds_rx(mfd, tp, rp, cmd, 3);

lp = (uint32 *)rp->data;

printk("%s: manufacture_id=%x", __func__, *lp);

return *lp;

}

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