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From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Christopher Bostic <cbostic@linux.vnet.ibm.com>,
	Joel Stanley <joel@jms.id.au>
Cc: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Russell King <linux@armlinux.org.uk>,
	rostedt@goodmis.org, mingo@redhat.com,
	Greg KH <gregkh@linuxfoundation.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Andrew Jeffery <andrew@aj.id.au>,
	Alistair Popple <alistair@popple.id.au>,
	"Edward A . James" <eajames@us.ibm.com>,
	Jeremy Kerr <jk@ozlabs.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@au1.ibm.com>

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.

  reply	other threads:[~2017-04-09 21:56 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
2017-03-29 17:43 ` [PATCH v4 01/23] drivers/fsi: Add fsi master definition 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 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 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
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 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 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
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
2017-04-05  1:24             ` Christopher Bostic
2017-04-09 21:22             ` Christopher Bostic
2017-04-09 21:41               ` Benjamin Herrenschmidt
2017-04-09 21:53                 ` Benjamin Herrenschmidt
2017-04-09 21:55                   ` Benjamin Herrenschmidt [this message]
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
2017-03-29 17:43 ` [PATCH v4 23/23] drivers/fsi: Use asynchronous slave mode Christopher Bostic

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