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From: Bart Van Assche <bvanassche@acm.org>
To: Kiwoong Kim <kwmad.kim@samsung.com>,
	linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
	alim.akhtar@samsung.com, avri.altman@wdc.com, jejb@linux.ibm.com,
	martin.petersen@oracle.com, beanhuo@micron.com,
	cang@codeaurora.org, adrian.hunter@intel.com, sc.suh@samsung.com,
	hy50.seo@samsung.com, sh425.lee@samsung.com,
	bhoon95.kim@samsung.com
Subject: Re: [RFC PATCH v1 0/2] scsi: ufs: introduce vendor isr
Date: Mon, 9 Aug 2021 09:08:56 -0700	[thread overview]
Message-ID: <32cc37cd-2f66-0f74-5242-cfcf86f58844@acm.org> (raw)
In-Reply-To: <000601d78cf2$a160f820$e422e860$@samsung.com>

On 8/9/21 12:46 AM, Kiwoong Kim wrote:
>> How about extending the UFS spec instead of adding a non-standard
>> mechanism in a driver that is otherwise based on a standard?
> 
> It seems to be a great approach but I wonder if extending for the events
> that all the SoC vendors require in the spec is recommendable.
> Because I think there is quite possible that many of those things are 
> originated for architectural reasons.

Has the interrupt mechanism supported by this patch series already been
implemented or is it still possible to change the ASIC design? In the
latter case, I propose the following:
* Drop the new interrupt.
* Instead of raising an interrupt if the UFS controller detects an
inconsistency, report this via a check condition code, e.g. LOGICAL UNIT
NOT READY, HARD RESET REQUIRED (there may be a better choice).

The above approach has the advantage that it does not slow down the UFS
interrupt handler.

Thanks,

Bart.



  reply	other threads:[~2021-08-09 16:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210806064923epcas2p13dd6b442eed02404d87684afd9c1b229@epcas2p1.samsung.com>
2021-08-06  6:34 ` Kiwoong Kim
     [not found]   ` <CGME20210806064924epcas2p4572538fd1fa7a73d8262737e38a9b537@epcas2p4.samsung.com>
2021-08-06  6:34     ` [RFC PATCH v1 1/2] " Kiwoong Kim
2021-08-06 16:18       ` Bart Van Assche
2021-08-09  7:33         ` Kiwoong Kim
     [not found]   ` <CGME20210806064925epcas2p2ba7e711758614384c17648d4924d025c@epcas2p2.samsung.com>
2021-08-06  6:34     ` [RFC PATCH v1 2/2] scsi: ufs: ufs-exynos: implement exynos isr Kiwoong Kim
2021-08-06 16:37       ` Bart Van Assche
2021-08-09  7:31         ` Kiwoong Kim
2021-08-06 16:14   ` [RFC PATCH v1 0/2] scsi: ufs: introduce vendor isr Bart Van Assche
2021-08-08  5:56     ` Avri Altman
2021-08-09  7:46     ` Kiwoong Kim
2021-08-09 16:08       ` Bart Van Assche [this message]
2021-08-13  5:31         ` Kiwoong Kim

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