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

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Date:	Mon, 09 Aug 2010 18:30:01 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Alex Dubov <oakad@...oo.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] MEMSTICK: Add driver for Ricoh R5C592 Card reader.

I have another question.

Looking at ms_block.c, I see that it sometimes changes register window.
This doesn't look good.
I see it does put the register window back, but still its a bit obscure.

I added tracking of current register window, so every time I send
MS_TPC_SET_RW_REG_ADRS I note the ranges.
And read/write functions now always attempt to send
MS_TPC_SET_RW_REG_ADRS. If the window is same as was  set last time, TPC
is skipped.

However, I am thinking, that maybe I should always write both param and
extra register? I just write 0xFF to extra register and thats all.
Windows driver does that partially. It writes 0xFF to managmemt and
0xF8 to overwrite flag (why???), but doesn't touch the LBA. I don't
think that matters.
It also always sends the MS_TPC_SET_RW_REG_ADRS, which I don't like.

Best regards,
Maxim Levitsky

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