linux-kernel - Re: [PATCH V3 1/1] mmc: sdhci: Fix the SD tuning issue that the SDHCI_TRANSFER

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Date:   Thu, 17 Nov 2022 09:15:58 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Charl Liu <charl.liu@...hubtech.com>, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shaper.liu@...hubtech.com, chevron.li@...hubtech.com,
        thomas.hu@...hubtech.com, xiaoguang.yu@...hubtech.com,
        shirley.her@...hubtech.com
Subject: Re: [PATCH V3 1/1] mmc: sdhci: Fix the SD tuning issue that the
 SDHCI_TRANSFER_MODE is cleared incorrectly

On 11/11/22 14:23, Charl Liu wrote:
> When cmd->opcode == MMC_SEND_TUNING_BLOCK, the SDHCI_TRANSFER_MODE
> should also be kept
> 
> Signed-off-by: Charl Liu <charl.liu@...hubtech.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>


> ---
> change in V1:
> Keeping the SDHCI_TRANSFER_MODE when cmd->opcode == MMC_END_TUNING_BLOCK
> 
> change in V2:
> add the mmc_op_tuning interface to judge if the opcode is tuning CMD
> 
> change in V3:
> cancel the redundant code
> ---
>  drivers/mmc/host/sdhci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index fef03de85b99..98ee688de50d 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1465,7 +1465,7 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
>  		if (host->quirks2 &
>  			SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
>  			/* must not clear SDHCI_TRANSFER_MODE when tuning */
> -			if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
> +			if (!mmc_op_tuning(cmd->opcode))
>  				sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
>  		} else {
>  		/* clear Auto CMD settings for no data CMDs */