linux-kernel - Re: [PATCH v5 2/8] firmware: add support for ARM System Control and Power Interface(SCPI) protocol

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Message-ID: <55BB5138.2010004@arm.com>
Date:	Fri, 31 Jul 2015 11:43:04 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Jassi Brar <jassisinghbrar@...il.com>
CC:	Sudeep Holla <sudeep.holla@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Punit Agrawal <Punit.Agrawal@....com>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Kevin Hilman <khilman@...nel.org>
Subject: Re: [PATCH v5 2/8] firmware: add support for ARM System Control and
 Power Interface(SCPI) protocol



On 31/07/15 11:38, Jassi Brar wrote:
> On Fri, Jul 31, 2015 at 3:10 PM, Sudeep Holla <sudeep.holla@....com> wrote:
>>
>> I forgot to mention, we have a the following description in
>> mbox_client_txdone which is misleading:
>>
>> "The client/protocol had received some 'ACK' packet and it notifies the
>> API that the last packet was sent successfully. This only works if the
>> controller can't sense TX-Done."
>>
>> which is clearly not the case in SCPI. IMO we may have to reword that.
>>
> Yes. And also see whether it could race with polling driven tx_tick.
>

Yes I am also looking at that now while I am trying to check if
TXDONE_BY_ACK works on Juno, will keep you posted.

Regards,
Sudeep
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