回复: [PATCH V1 1/1] mmc:sdhci:Fix the SD tuning CMD parameter issue that the SDHCI_TRANSFER_MODE is cleared from read direction to write direction incorrectly

[Chevron Li (WH)]

Hi, Adrian,

Sorry response you so late.

Does your comment "mmc_op_tuning() could be used here" means that we should use mmc_send_tuning() instead of sdhci_send_tuning?

If yes, I think we need add below patch commit by Charl Liu for those reasons:
1.Bayhub host tuning command does not have a data payload and our hardware does it automatically, so mmc_send_tuning() will return -EIO.
2.Bayhub host can be used for both SD and eMMC cards.
3.Both MMC_SEND_TUNING_BLOCK and MMC_SEND_TUNING_BLOCK_HS200 are tuning command opcode, maybe the same logical at here is better? 

BR,
Chevron

-----邮件原件-----
发件人: Adrian Hunter <adrian.hunter@xxxxxxxxx> 
发送时间: Sunday, July 24, 2022 15:22
收件人: Charl Liu (WH) <charl.liu@xxxxxxxxxxxxxx>; ulf.hansson@xxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
抄送: Shaper Liu (WH) <shaper.liu@xxxxxxxxxxxxxx>; Chevron Li (WH) <chevron.li@xxxxxxxxxxxxxx>; Thomas Hu(WH) <thomas.hu@xxxxxxxxxxxxxx>; XiaoGuang Yu (WH) <xiaoguang.yu@xxxxxxxxxxxxxx>; Shirley Her(SC) <shirley.her@xxxxxxxxxxxxxx>
主题: Re: [PATCH V1 1/1] mmc:sdhci:Fix the SD tuning CMD parameter issue that the SDHCI_TRANSFER_MODE is cleared from read direction to write direction incorrectly

On 20/07/22 15:37, 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@xxxxxxxxxxxxxx>
> ---
> Change in V1:
> Keeping the SDHCI_TRANSFER_MODE when cmd->opcode == MMC_END_TUNING_ 
> BLOCK
> ---
>  drivers/mmc/host/sdhci.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 
> 22152029e14c..6a0f6725dadb 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1430,7 +1430,8 @@ 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 ((cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
> +			(cmd->opcode != MMC_SEND_TUNING_BLOCK))

mmc_op_tuning() could be used here

>  				sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
>  		} else {
>  		/* clear Auto CMD settings for no data CMDs */