linux-kernel - Re: [PATCH 03/11] Input: synaptics-rmi4 - do not update configuration in rmi_f01

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Message-ID: <20140217192321.GC19223@core.coreip.homeip.net>
Date:	Mon, 17 Feb 2014 11:23:22 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Christopher Heiny <cheiny@...aptics.com>
Cc:	Andrew Duggan <aduggan@...aptics.com>,
	Vincent Huang <vincent.huang@...synaptics.com>,
	Vivian Ly <vly@...aptics.com>,
	Daniel Rosenberg <daniel.rosenberg@...aptics.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Linux Input <linux-input@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/11] Input: synaptics-rmi4 - do not update
 configuration in rmi_f01_probe()

On Fri, Feb 14, 2014 at 03:00:43PM -0800, Christopher Heiny wrote:
> On 02/13/2014 01:54 PM, Dmitry Torokhov wrote:
> >On Thu, Feb 13, 2014 at 11:23:44AM -0800, Christopher Heiny wrote:
> >>>On 02/12/2014 09:27 PM, Dmitry Torokhov wrote:
> >>>> >Do not write configuration data in probe(), we have config() for that.
> >>>
> >>>Then we should call config() in rmi_function_probe() to ensure that
> >>>any platform data or device tree configuration settings get written
> >>>to the device.
> >
> >Well, yes, we may elect to update device configuration in probe, but
> >then we should not be doing that 2nd time in ->config(). We shoudl pick
> >either one or another.
> 
> But as the code currently stands, config() is only called when a
> device reset is detected, not during initialization.  So if there's
> platform specific configuration data that needs to be written to a
> function, it won't get written until after a device reset occurs,
> which might never happen.  So either we need to write that data (or
> call config()) in each function's probe(), or in
> rmi_function_probe().

Ah, I missed the fact that we do not normally call ->config() unless
device was reset. BTW, if device was reset, shouldn't we tear down
everything and then reenumerate all functions?

-- 
Dmitry
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