spi_async data wrong in linux!!

[yongleili717]

Hello, our IMX6ul SPI interface for data reading, ADC is TI's ADC124S051. When using spi_sync, the data can be read correctly. When using spi_async to read data, some error data will be collected. Below is my driver core code:

static int adc124s_adc_conversion(struct spi_device *spi, int count)

{

    int i,ret;

    u8 tx_buffer[1600];

    struct spi_transfer spi_trans_low = {

        .rx_buf = mmap_buffer,

        .tx_buf = tx_buffer,

        .len = 1496,

        //.cs_change = 0,

        .speed_hz = 5000000,

        .bits_per_word = BITS_PER_WORD,

    };

    struct spi_transfer spi_trans_high = {

        .rx_buf = mmap_buffer + 1496,

        .tx_buf = tx_buffer,

        .len = 1496,

        //.cs_change = 0,

        .speed_hz = 5000000,

        .bits_per_word = BITS_PER_WORD,

    };

    struct spi_message message_low;

    struct spi_message message_high;

    ret = 0;    

    for(i=0;i<1600;i++)

    {

        tx_buffer[i] = 0;

    }

    /* Do the transfer */

    switch(count)

    {

        case 1:

            date = 1;

            spi_message_init(&message_low);

            message_low.complete = adc_complete;

            message_low.context = NULL;

            spi_message_add_tail(&spi_trans_low, &message_low);

            ret=spi_async(spi, &message_low);

        break;

        case 2:

            date = 2;

            spi_message_init(&message_high);

            message_high.complete = adc_complete;

            message_high.context = NULL;

            spi_message_add_tail(&spi_trans_high, &message_high);

            ret=spi_async(spi, &message_high);

        break;

        default:

            printk("input count is err\n");

        break;

    }   

    return ret;

}

static void adc_complete(void *context)

{

    int ret,i;

    switch(date)

    {

        case 1:

            //可读时第三个参数设置为POLL_IN,可写时第三个参数设置为POLL_OUT

            //在这里将其仅仅作为一个参数值，POLL_IN=1；POLL_OUT=2

            for(i=0;i<748;i++)

            {

                printk("this is mmap_buffer[%d] : %d\n",i*2,mmap_buffer[i*2]);

            }

            kill_fasync(&button_async, SIGIO, POLL_IN);

            msleep(3000);

            ret=adc124s_adc_conversion(g_spi,2);

            break;

        case 2:

            for(i=748;i<1496;i++)

            {

                printk("this is mmap_buffer[%d] : %d\n",i*2,mmap_buffer[i*2]);

            }

            kill_fasync(&button_async, SIGIO, POLL_OUT);

            msleep(3000);

            ret=adc124s_adc_conversion(g_spi,1);

            break;

        default: printk("this is faile\n");

            break;

    }

}

static ssize_t adc124s_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)

{

    int ret = 0;

    ret=adc124s_adc_conversion(g_spi,1);/* count每次读取的数据量 */

    return ret;

}

[igorpadykov]

Hi 永磊 李

what bsp used in the case, one can try with latest nxp

linux-imx - i.MX Linux kernel 

also if sdma is used in the case one can try to disable sdma.

Best regards
igor
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[yongleili717]

Linux 4.1.15，

[igorpadykov]

please try with latest nxp

linux-imx - i.MX Linux kernel 

Best regards
igor