v3s sd卡启动，有时会出这样的错误，系统卡住，连看门狗复位都无法重启。是啥原因？？请教大家
[ 6.219424] sunxi-mmc 1c0f000.mmc: data error, sending stop command
[ 7.175179] sched: RT throttling activated
[ 7.225185] sunxi-mmc 1c0f000.mmc: send stop command failed
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static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
{
struct sunxi_mmc_host *host = dev_id;
struct mmc_request *mrq;
unsigned long iflags;
spin_lock_irqsave(&host->lock, iflags);
mrq = host->manual_stop_mrq;
spin_unlock_irqrestore(&host->lock, iflags);
if (!mrq) {
dev_err(mmc_dev(host->mmc), "no request for manual stop\n");
return IRQ_HANDLED;
}
dev_err(mmc_dev(host->mmc), "data error, sending stop command\n");
/*
* We will never have more than one outstanding request,
* and we do not complete the request until after
* we've cleared host->manual_stop_mrq so we do not need to
* spin lock this function.
* Additionally we have wait states within this function
* so having it in a lock is a very bad idea.
*/
sunxi_mmc_send_manual_stop(host, mrq);
spin_lock_irqsave(&host->lock, iflags);
host->manual_stop_mrq = NULL;
spin_unlock_irqrestore(&host->lock, iflags);
mmc_request_done(host->mmc, mrq);
return IRQ_HANDLED;
}
static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
struct mmc_request *req)
{
u32 arg, cmd_val, ri;
unsigned long expire = jiffies + msecs_to_jiffies(1000);
cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;
if (req->cmd->opcode == SD_IO_RW_EXTENDED) {
cmd_val |= SD_IO_RW_DIRECT;
arg = (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
((req->cmd->arg >> 28) & 0x7);
} else {
cmd_val |= MMC_STOP_TRANSMISSION;
arg = 0;
}
mmc_writel(host, REG_CARG, arg);
mmc_writel(host, REG_CMDR, cmd_val);
do {
ri = mmc_readl(host, REG_RINTR);
} while (!(ri & (SDXC_COMMAND_DONE | SDXC_INTERRUPT_ERROR_BIT)) &&
time_before(jiffies, expire));
if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
dev_err(mmc_dev(host->mmc), "send stop command failed\n");
if (req->stop)
req->stop->resp[0] = -ETIMEDOUT;
} else {
if (req->stop)
req->stop->resp[0] = mmc_readl(host, REG_RESP0);
}
mmc_writel(host, REG_RINTR, 0xffff);
}
找到了两个相关的函数，不知道什么原因引起的，不是每次都会出错，偶尔出问题，很要命。
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不是开发板，批量做了，大概10个板会有一个出这种问题，而且出问题的可能过段时间又好了
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有加上拉，硬件没问题
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总线宽度改成1，是否会降低读写速度，我改成了1，试试看
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