linux-kernel - Re: [PATCH v4 2/8] firmware: add support for ARM System Control and Power Interface(SCPI) protocol

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Message-ID: <55798BE4.2000604@arm.com>
Date:	Thu, 11 Jun 2015 14:23:48 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Jassi Brar <jaswinder.singh@...aro.org>
CC:	Sudeep Holla <sudeep.holla@....com>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...nel.org>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v4 2/8] firmware: add support for ARM System Control and
 Power Interface(SCPI) protocol



On 11/06/15 12:54, Jassi Brar wrote:
> On 8 June 2015 at 16:09, Sudeep Holla <sudeep.holla@....com> wrote:
> ...
>> +
>> +static void scpi_process_cmd(struct scpi_chan *ch, u32 cmd)
>> +{
>> +       unsigned long flags;
>> +       struct scpi_xfer *t, *match = NULL;
>> +
>> +       spin_lock_irqsave(&ch->rx_lock, flags);
>> +       if (list_empty(&ch->rx_pending)) {
>> +               spin_unlock_irqrestore(&ch->rx_lock, flags);
>> +               return;
>> +       }
>> +
>> +       list_for_each_entry(t, &ch->rx_pending, node)
>> +               if (CMD_XTRACT_UNIQ(t->cmd) == CMD_XTRACT_UNIQ(cmd)) {
>> +                       list_del(&t->node);
>> +                       match = t;
>> +                       break;
>> +               }
>> +       /* check if wait_for_completion is in progress or timed-out */
>> +       if (match && !completion_done(&match->done)) {
>> +               struct scpi_shared_mem *mem = ch->rx_payload;
>> +               unsigned int len = min(match->rx_len, CMD_SIZE(cmd));
>> +
>> +               match->status = le32_to_cpu(mem->status);
>> +               memcpy_fromio(match->rx_buf, mem->payload, len);
>> +               if (match->rx_len > len)
>> +                       memset(match->rx_buf + len, 0, match->rx_len - len);
>> +               complete(&match->done);
>> +       }
>> +       spin_unlock_irqrestore(&ch->rx_lock, flags);
>> +}
> There doesn't seem to be support for commands sent by remote?
> Something like when remote is the thermal master and it needs to send
> sensor readings crossing thresholds.
>

SCP firmware claims to support that but never tested on Juno platform.
So I would like to add it when there's first user for that.

Regards,
Sudeep
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