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

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Message-ID: <494015.19325.qm@web37608.mail.mud.yahoo.com>
Date:	Sat, 7 Aug 2010 06:15:55 -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.

> > > > > > > 
> > > > > > > That's how its called in the
> spec.
> > > > > > > Sectors can be larger than
> 512b on
> > > Pro-HG sticks, and
> > > > > > there's additional
> > > > > > > TPC_READ/WRITE_QUAD_DATA
> which operates
> > > on larger
> > > > > > quantities.
> > > > > > But not on ordinary PRO, right?
> > > > > 
> > > > > Pro sectors are normally 512 bytes.
> > > > > 
> > > > > > 
> > > > > > Small question, can I use Pro-HG
> stick in my
> > > reader that is
> > > > > > designed for
> > > > > > Standard/PRO only? Does your
> subsystem
> > > support it?
> > > > > 
> > > > > It should work. It works for me on TI,
> which has
> > > no 8b mode either.
> > > > In that case, is there an upper limit on
> sector size?
> > > Also, you don't use the MS_TPC_READ_QUAD_DATA at
> all.
> > > So mspro_blk.c won't work with >512
> bytes/sector disk?
> > > Or there is some compatibility?
> > > 
> > 
> > The code can work with arbitrarily sized pages, 512b
> > value is not hard coded. All that is needed is to
> slightly alter 
> > h_mspro_block_transfer_data function, given, of
> course, that adapters
> > support longer transfer 
> 
> No, I mean if I go and buy memstick PRO HG, that has >
> 512 bytes/sector,
> will it work with current code?
> 
> Btw, there is currently no way of telling core about
> maximum transfer
> length.
> Here absolute maximum is 1024 (number of bit that _might_
> hold TPC
> length), and FIFO size is 512 bytes (maybe its possible to
> use fifo
> twice)
> 

On TI adapters, FIFO can be reused and DMA restarted. Jmicron adapters are
funny beasts, but their team is keen to support MSpro-HG, so at some
point it will be fully possible, though, probably, not with every version
of the chipset.




      
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