linux-kernel - Re: [PATCH] mmc: rpmb: do not force a retune before RPMB switch

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Message-ID: <4f320a33-b305-4cfb-9601-6d4ad389aa18@intel.com>
Date: Wed, 3 Jan 2024 10:08:25 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Jorge Ramirez-Ortiz <jorge@...ndries.io>, Avri.Altman@....com,
 ulf.hansson@...aro.org, christian.loehle@....com
Cc: jinpu.wang@...os.com, axboe@...nel.dk, beanhuo@...ron.com,
 yibin.ding@...soc.com, victor.shih@...esyslogic.com.tw, asuk4.q@...il.com,
 hkallweit1@...il.com, yangyingliang@...wei.com, yebin10@...wei.com,
 linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: rpmb: do not force a retune before RPMB switch

On 2/01/24 21:02, Adrian Hunter wrote:
> On 4/12/23 17:01, Jorge Ramirez-Ortiz wrote:
>> Requesting a retune before switching to the RPMB partition has been
>> observed to cause CRC errors on the RPMB reads (-EILSEQ).
>>
>> Since RPMB reads can not be retried, the clients would be directly
>> affected by the errors.
>>
>> This commit disables the request prior to RPMB switching while allowing
>> the pause interface to still request a retune before the pause for other
>> use cases.
>>
>> This was verified with the sdhci-of-arasan driver (ZynqMP) configured
>> for HS200 using two separate eMMC cards (DG4064 and 064GB2). In both
>> cases, the error was easy to reproduce triggering every few tenths of
>> reads.
>>
>> Signed-off-by: Jorge Ramirez-Ortiz <jorge@...ndries.io>
> 
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>

Oops, this is the wrong patch.  I meant to ack the later one,
which I have now.

> 
>> ---
>>  drivers/mmc/core/block.c | 2 +-
>>  drivers/mmc/core/host.c  | 7 ++++---
>>  drivers/mmc/core/host.h  | 2 +-
>>  3 files changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
>> index f9a5cffa64b1..1d69078ad9b2 100644
>> --- a/drivers/mmc/core/block.c
>> +++ b/drivers/mmc/core/block.c
>> @@ -859,7 +859,7 @@ static int mmc_blk_part_switch_pre(struct mmc_card *card,
>>  			if (ret)
>>  				return ret;
>>  		}
>> -		mmc_retune_pause(card->host);
>> +		mmc_retune_pause(card->host, false);
>>  	}
>>  
>>  	return ret;
>> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
>> index 096093f7be00..a9b95aaa2235 100644
>> --- a/drivers/mmc/core/host.c
>> +++ b/drivers/mmc/core/host.c
>> @@ -119,13 +119,14 @@ void mmc_retune_enable(struct mmc_host *host)
>>  
>>  /*
>>   * Pause re-tuning for a small set of operations.  The pause begins after the
>> - * next command and after first doing re-tuning.
>> + * next command and, if retune is set, after first doing re-tuning.
>>   */
>> -void mmc_retune_pause(struct mmc_host *host)
>> +void mmc_retune_pause(struct mmc_host *host, bool retune)
>>  {
>>  	if (!host->retune_paused) {
>>  		host->retune_paused = 1;
>> -		mmc_retune_needed(host);
>> +		if (retune)
>> +			mmc_retune_needed(host);
>>  		mmc_retune_hold(host);
>>  	}
>>  }
>> diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
>> index 48c4952512a5..321776b52270 100644
>> --- a/drivers/mmc/core/host.h
>> +++ b/drivers/mmc/core/host.h
>> @@ -18,7 +18,7 @@ void mmc_retune_disable(struct mmc_host *host);
>>  void mmc_retune_hold(struct mmc_host *host);
>>  void mmc_retune_release(struct mmc_host *host);
>>  int mmc_retune(struct mmc_host *host);
>> -void mmc_retune_pause(struct mmc_host *host);
>> +void mmc_retune_pause(struct mmc_host *host, bool retune);
>>  void mmc_retune_unpause(struct mmc_host *host);
>>  
>>  static inline void mmc_retune_clear(struct mmc_host *host)
>