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

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Date:	Thu, 11 Jun 2015 17:24:19 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-pm@...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 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.
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