linux-kernel - Re: [PATCH 1/1] mmc: sdhci: Fixed too many logs being printed during tuning

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Date:   Fri, 18 Nov 2022 17:25:27 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, megoo.tang@...il.com,
        lzx.stg@...il.com
Subject: Re: [PATCH 1/1] mmc: sdhci: Fixed too many logs being printed during tuning

On Thu, Nov 17, 2022 at 12:00 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 11/11/22 10:42, Wenchao Chen wrote:
> > From: Wenchao Chen <wenchao.chen@...soc.com>
> >
> > During the HS200 tuning process, too many tuning errors are printed in
> > the log.
> >
> > Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
> > ---
> >  drivers/mmc/host/sdhci.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index fef03de85b99..a503b54305eb 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -3401,6 +3401,10 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
> >               if (host->pending_reset)
> >                       return;
> >
> > +             command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
> > +             if (command == MMC_SEND_TUNING_BLOCK || command == MMC_SEND_TUNING_BLOCK_HS200)
> > +                     return;
>
> Normally we wouldn't get here even if a request got an error because
> then we either reset the data circuit which should stop further
> interrupts, or set host->pending_reset.
>
> Can you elaborate on what is going wrong?
>
Hi  adrian
1. In the process of tuning, not all tuning values are good, some
tuning values may cause errors, and these errors print too many logs.
    Of course, we reset the cmdline or dataline on error.
2. use host->pending_reset = true
static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
{
...
if (sdhci_needs_reset(host, mrq))
host->pending_reset = true;
...
}

But intmask = 0x00200000
static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
{
...
if (!host->data) {
struct mmc_command *data_cmd = host->data_cmd;

if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
if (intmask & SDHCI_INT_DATA_TIMEOUT) { //#define
SDHCI_INT_DATA_TIMEOUT 0x00100000
host->data_cmd = NULL;
data_cmd->error = -ETIMEDOUT;
sdhci_err_stats_inc(host, CMD_TIMEOUT);
__sdhci_finish_mrq(host, data_cmd->mrq);//<=
return;
}
if (intmask & SDHCI_INT_DATA_END) {    //#define  SDHCI_INT_DATA_END 0x00000002

host->data_cmd = NULL;
/*
* Some cards handle busy-end interrupt
* before the command completed, so make
* sure we do things in the proper order.
*/
if (host->cmd == data_cmd)
return;

__sdhci_finish_mrq(host, data_cmd->mrq);//<=
return;
}
}
...
if (host->pending_reset)
return;

pr_err("%s: Got data interrupt 0x%08x even though no data operation
was in progress.\n",
       mmc_hostname(host->mmc), (unsigned)intmask);
sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
sdhci_dumpregs(host);

return;
}
...
}

> > +
> >               pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
> >                      mmc_hostname(host->mmc), (unsigned)intmask);
> >               sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>