Re: [PATCH 03/11] Input: synaptics-rmi4 - do not update configuration in rmi_f01_probe()

[Dmitry Torokhov]

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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