From: Benjamin Herrenschmidt <benh-8fk3Idey6ehBDgjK7y7TUQ@public.gmane.org>
To: Christopher Bostic
<cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Joel Stanley <joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org,
mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
Greg KH
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Andrew Jeffery <andrew-zrmu5oMJ5Fs@public.gmane.org>,
Alistair Popple
<alistair-Y4h6yKqj69EXC2x5gXVKYQ@public.gmane.org>,
"Edward A . James"
<eajames-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
Jeremy Kerr <jk-mnsaURCQ41sdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v4 19/23] drivers/fsi: Add GPIO based FSI master
Date: Mon, 10 Apr 2017 07:55:37 +1000 [thread overview]
Message-ID: <1491774937.4166.198.camel@au1.ibm.com> (raw)
In-Reply-To: <1491774835.4166.197.camel-8fk3Idey6ehBDgjK7y7TUQ@public.gmane.org>
On Mon, 2017-04-10 at 07:53 +1000, Benjamin Herrenschmidt wrote:
> FYI. pdbg in userspace operates without any delays in practice, the
> overhead between the various load/store instructions seems
> sufficient.
>
> The only delay that's needed is when going through the FSI2PIB (to do
> SCOMs) where it seems like back-2-back accesses can be problematic.
Note: This isn't an objection to merging the patches. We can look at
doing an improved backend later.
Cheers,
Ben.
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next prev parent reply other threads:[~2017-04-09 21:55 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-29 17:43 [PATCH v4 00/23] FSI device driver implementation Christopher Bostic
[not found] ` <20170329174340.89109-1-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-03-29 17:43 ` [PATCH v4 01/23] drivers/fsi: Add fsi master definition Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 07/23] drivers/fsi: Implement slave initialisation Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 08/23] drivers/fsi: Set slave SMODE to init communication Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 09/23] drivers/fsi: scan slaves & register devices Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 10/23] drivers/fsi: Add device read/write/peek API Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 15/23] drivers/fsi: expose direct-access slave API Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 16/23] drivers/fsi: Add tracepoints for low-level operations Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 23/23] drivers/fsi: Use asynchronous slave mode Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 02/23] drivers/fsi: Add slave definition Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 03/23] drivers/fsi: Add empty master scan Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 04/23] drivers/fsi: Add crc4 helpers Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 05/23] drivers/fsi: Add slave & master read/write APIs Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 06/23] drivers/fsi: Set up links for slave communication Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 11/23] drivers/fsi: Add master unscan Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 12/23] drivers/fsi: Add documentation for GPIO bindings Christopher Bostic
[not found] ` <20170329174340.89109-13-cbostic-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-04-03 15:24 ` Rob Herring
2017-03-29 17:43 ` [PATCH v4 13/23] drivers/fsi: Add client driver register utilities Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 14/23] drivers/fsi: Add sysfs files for FSI master & slave accesses Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 17/23] drivers/fsi: Add error handling for slave communication errors Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 18/23] drivers/fsi: Document FSI master sysfs files in ABI Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 19/23] drivers/fsi: Add GPIO based FSI master Christopher Bostic
2017-03-30 5:48 ` Joel Stanley
[not found] ` <CACPK8XfOSYPidHF6=psC4mP-tkRyWTu0psdcK6EwA2E6FF53Uw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-03-30 18:15 ` Christopher Bostic
2017-03-30 20:50 ` Benjamin Herrenschmidt
2017-04-04 17:32 ` Christopher Bostic
2017-04-04 22:19 ` Benjamin Herrenschmidt
[not found] ` <1491344360.4166.68.camel-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2017-04-05 1:24 ` Christopher Bostic
2017-04-09 21:22 ` Christopher Bostic
2017-04-09 21:41 ` Benjamin Herrenschmidt
[not found] ` <1491774092.4166.195.camel-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2017-04-09 21:53 ` Benjamin Herrenschmidt
[not found] ` <1491774835.4166.197.camel-8fk3Idey6ehBDgjK7y7TUQ@public.gmane.org>
2017-04-09 21:55 ` Benjamin Herrenschmidt [this message]
[not found] ` <0e1bcf3a-e8d7-9f50-bdf7-2a1e7466665b-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2017-03-30 22:57 ` Joel Stanley
2017-03-29 17:43 ` [PATCH v4 20/23] drivers/fsi/gpio: Add tracepoints for GPIO master Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 21/23] drivers/fsi: Add SCOM FSI client device driver Christopher Bostic
2017-03-29 17:43 ` [PATCH v4 22/23] drivers/fsi: Add hub master support Christopher Bostic
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