linux-kernel - Re: [PATCH 2/2] MEMSTICK: Add driver for Ricoh R5C592 Card reader.

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Message-ID: <199584.21009.qm@web37604.mail.mud.yahoo.com>
Date:	Wed, 11 Aug 2010 01:08:51 -0700 (PDT)
From:	Alex Dubov <oakad@...oo.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] MEMSTICK: Add driver for Ricoh R5C592 Card reader.

> I know everything you have just said.
> I just want to point out that code in many places assumes
> that register
> window is the same as set on device initialization.

It's not.
Can you please point at a particular place?

> > But, if you're using the auto incrementing write, you
> will have to write
> > extra register for every page transferred.
> But what if I fill extra register with 0xFF?
> And besides on reads, the fact that I *write* the extra
> register before
> I execute read command shouldn't matter at all regardless
> of what I
> write there.
> On writes however I *do* need to write extra register
> anyway with proper
> values.
> 
> Therefore I see no reason why I can't set write window to
> cover both
> param and extra register, and leave it always like that.

Because when you do autoincrementing write you _can not_ write into param register. You will break the command execution.

On the other thought, it may be unnecessary to write unique extra data to every page, so one full register write at the beginning of the command may do. Considering, that legacy memstick is not going to evolve, this may be reasonable assumption.

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