linux-kernel - Re: 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

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Date:   Wed, 31 Aug 2022 16:49:49 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Chevron Li (WH)" <chevron.li@...hubtech.com>,
        "Charl Liu (WH)" <charl.liu@...hubtech.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "Shaper Liu (WH)" <shaper.liu@...hubtech.com>,
        "Thomas Hu(WH)" <thomas.hu@...hubtech.com>,
        "XiaoGuang Yu (WH)" <xiaoguang.yu@...hubtech.com>,
        "Shirley Her(SC)" <shirley.her@...hubtech.com>
Subject: Re: 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

On 31/08/22 15:04, Chevron Li (WH) wrote:
> 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?

I just meant, instead of:

-			if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+			if ((cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
+			    (cmd->opcode != MMC_SEND_TUNING_BLOCK))

this is simpler:

-			if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+			if (!mmc_op_tuning(cmd->opcode))


> 
> 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@...el.com> 
> 发送时间: Sunday, July 24, 2022 15:22
> 收件人: Charl Liu (WH) <charl.liu@...hubtech.com>; ulf.hansson@...aro.org; linux-mmc@...r.kernel.org; linux-kernel@...r.kernel.org
> 抄送: Shaper Liu (WH) <shaper.liu@...hubtech.com>; Chevron Li (WH) <chevron.li@...hubtech.com>; Thomas Hu(WH) <thomas.hu@...hubtech.com>; XiaoGuang Yu (WH) <xiaoguang.yu@...hubtech.com>; Shirley Her(SC) <shirley.her@...hubtech.com>
> 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@...hubtech.com>
>> ---
>> 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 */
>