linux-kernel - RE: [PATCH] ARM: PL011: add support for extended FIFO-size of PL011-r1p5

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Date:	Thu, 16 May 2013 22:26:41 +0900
From:	"Jongsung Kim" <neidhard.kim@....com>
To:	"'Stephen Warren'" <swarren@...dotorg.org>
Cc:	"'Russell King'" <linux@....linux.org.uk>,
	"'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>,
	<jslaby@...e.cz>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-rpi-kernel@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] ARM: PL011: add support for extended FIFO-size of PL011-r1p5

Stephen Warren <swarren@...dotorg.org> :
>> All r1p5 have 32-byte FIFO depth and it's not configurable. From the
PL011
>> TRM:
>> 
>> r1p4-r1p5	Contains the following differences in functionality:
>> 		* The receive and transmit FIFOs are increased to a depth of
32.
>> 		* The Revision field in the UARTPeriphID2 Register on page
3-24
>> 		  bits [7:4] now reads back as 0x3.
>
> Well, that certainly isn't true in practice. I think we should revert
> this commit until we can determine what the problem is.

I asked to the ARM support about this. Waiting for reply..

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