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

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Date:	Tue, 21 May 2013 10:39:46 +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

Jongsung Kim <neidhard.kim@....com> :
> 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..

ARM support said they doesn't have information about BCM2835 UART. Does
anyone have a communication channel to Broadcom? It takes time for me to
get contact point to Broadcom.. (I'm trying)

However, ARM support also said:

"If the Broadcom part definitely has 16-deep FIFOs, it cannot be based
on a PL011 r1p5, so I might guess that Broadcom have just referenced
the latest version of the documentation on our website, but have actually
implemented an earlier version."

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