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

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Date:   Wed, 16 Nov 2022 18:00:18 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Wenchao Chen <wenchao.chen666@...il.com>, ulf.hansson@...aro.org
Cc:     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 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?

> +
>  		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);