linux-kernel - Re: [RESEND,v3,2/2] ufs: poll HCS.UCRDY before issuing a UIC command

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Message-Id: <20230904082756.19693-1-cw9316.lee@samsung.com>
Date:   Mon,  4 Sep 2023 17:27:56 +0900
From:   Chanwoo Lee <cw9316.lee@...sung.com>
To:     kwmad.kim@...sung.com
Cc:     adrian.hunter@...el.com, alim.akhtar@...sung.com,
        avri.altman@....com, beanhuo@...ron.com, bvanassche@....org,
        hy50.seo@...sung.com, jejb@...ux.ibm.com, junwoo80.lee@...sung.com,
        kwangwon.min@...sung.com, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        sc.suh@...sung.com, sh425.lee@...sung.com, wkon.kim@...sung.com,
        Chanwoo Lee <cw9316.lee@...sung.com>
Subject: Re: [RESEND,v3,2/2] ufs: poll HCS.UCRDY before issuing a UIC
 command

On 9/04/23 5:31 PM, cw9316.lee@...sung.com wrote:
> With auto hibern8 enabled, UIC could be working
> for a while to process a hibern8 operation and HCI
> reports UIC not ready for a short term through HCS.UCRDY.
> And UFS driver can't recognize the operation.
> UFSHCI spec specifies UCRDY like this:
> whether the host controller is ready to process UIC COMMAND
> 
> The 'ready' could be seen as many different meanings. If the meaning
> includes not processing any request from HCI, processing a hibern8
> operation can be 'not ready'. In this situation, the driver needs to
> wait until the operations is completed.
> 
> Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
> Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>
> ---

Reviewed-by: Junwoo Lee <junwoo80.lee@...sung.com>
Reviewed-by: Chanwoo Lee <cw9316.lee@...sung.com>