From: Tushar Nimkar <tnimkar@codeaurora.org>
To: Oliver Neukum <oneukum@suse.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>,
Greg KH <gregkh@linuxfoundation.org>,
AlanStern <stern@rowland.harvard.edu>,
Tushar Nimkar <tushar.nims@gmail.com>,
Mathias Nyman <mathias.nyman@linux.intel.com>,
linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
linux-usb-owner@vger.kernel.org
Subject: Fwd: usb: uas: device reset most the time while enumeration- usb3.0
Date: Thu, 24 May 2018 20:13:53 +0530 [thread overview]
Message-ID: <29a119a245dc7a0948a9c10c8bfab262@codeaurora.org> (raw)
Oliver,
On 2018-05-17 19:04, Oliver Neukum wrote:
> Am Donnerstag, den 17.05.2018, 12:29 +0530 schrieb Tushar Nimkar:
>> Those commands issued from different layers say: sd.. uas.. scsi..
>> so making them to go one after other. Once REPORT_LUN done go with
>> READ_CAPACITY_16.
>> This is only for the UAS devices. I believe no disturb to BOT
>> behavior.
>
> Hi,
>
> this is good news.
>
> 1. We cannot slow down all UAS devices because a few are broken. This
> would need to be selective.
> 2. What is insufficient about "shost->async_scan" for your approach?
Unfortunately for our build CONFIG_SCSI_SCAN_ASYNC wan not set.
And enabling it solves our issue of enumeration.
But as per bellow commit
"If you have built SCSI as modules, enabling this option can
be a problem as the devices may not have been found by the time your
system expects them to have been."
commit 21db1882f79a1ad5977cae6766376a63f60ec414
Author: Matthew Wilcox <matthew@wil.cx>
Date: Wed Nov 22 13:24:52 2006 -0700
[SCSI] Add Kconfig option for asynchronous SCSI scanning
Without this patch, the user has to add a kernel command line
parameter
to get asynchronous SCSI scanning. Now they can select the default
at
compile time and still override it at boot time if they need to.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
We have built SCSI as module will it cause any problem to enable
CONFIG_SCSI_SCAN_ASYNC ?
>
> Regards
> Oliver
>
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next reply other threads:[~2018-05-24 14:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-24 14:43 Tushar Nimkar [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-06-05 12:48 Fwd: usb: uas: device reset most the time while enumeration- usb3.0 Tushar Nimkar
2018-06-04 14:27 Oliver Neukum
2018-05-29 9:02 Tushar Nimkar
2018-05-28 12:42 Oliver Neukum
2018-05-17 13:34 Oliver Neukum
2018-05-17 6:59 Tushar Nimkar
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