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

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Message-ID: <8433ae30-2633-1f32-ef11-2168c9cfea80@intel.com>
Date:   Fri, 18 Nov 2022 17:57:42 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Wenchao Chen <wenchao.chen666@...il.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 18/11/22 11:25, Wenchao Chen wrote:
> 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;
> }
> ...
> }

Not really following that I'm sorry.

Are you saying you get a data interrupt after he data circuit is reset?

> 
>>> +
>>>               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);
>>