linux-kernel - RE: [PATCH] mmc: block: enable cache-flushing when mmc cache is on

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Message-ID: <DM6PR04MB6575A4A2A687A876EA5C04B7FC119@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Wed, 16 Mar 2022 11:09:07 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Michael Wu <michael@...winnertech.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "porzio@...il.com" <porzio@...il.com>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        allwinner-opensource-support 
        <allwinner-opensource-support@...winnertech.com>
Subject: RE: [PATCH] mmc: block: enable cache-flushing when mmc cache is on

> Hi Avril & Adrian,
> Thanks for your efforts. Could we have an agreement now --
> 
> 1. enabling-cache and cmd23/reliable-write should be independent;
> 
> Here's what I found in the spec JESD84-B51:
>  > 6.6.31 Cache
>  > Caching of data shall apply only for the single block
>  > read/write(CMD17/24), pre-defined multiple block
>  > read/write(CMD23+CMD18/25) and open ended multiple block
>  > read/write(CMD18/25+CMD12) commands and excludes any other access
>  > e.g., to the register space(e.g., CMD6).
> Which means with CMD18/25+CMD12 (without using CMD23), the cache can
> also be enabled. Maybe this could be an evidence of the independence
> between enabling-cache and cmd23/reliable-write?
Acked-by: Avri Altman <avri.altman@....com>

Thanks,
Avri

> 
> 2. We don't consider supporting SD in this change.
> 
>  > On 14/03/2022 19:10, Avri Altman wrote:
>  >> Here is what our SD system guys wrote:
>  >> " In SD we don’t support reliable write and this eMMC driver may not
>  >>    be utilizing the cache feature we added in SD5.0.
>  >>   The method of cache flush is different between SD and eMMC."
>  >>
>  >> So adding SD seems to be out of scope of this change.
> 
> Is there anything else I can do about this patch? Thanks again.
> 
> --
> Best Regards,
> Michael Wu