lkml.org 
[lkml]   [2021]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v4 11/12] [RFC] firmware: arm_scmi: Add sync_cmds_atomic_replies transport flag
On Wed, Aug 25, 2021 at 12:38 PM Florian Fainelli <f.fainelli@gmail.com> wrote:
>
>
>
> On 8/24/2021 3:59 PM, Cristian Marussi wrote:
> > A flag is added to let the transport signal the core that its handling of
> > synchronous command messages implies that, after .send_message has returned
> > successfully, the requested command can be assumed to be fully and
> > completely executed on SCMI platform side so that any possible response
> > value is already immediately available to be retrieved by a .fetch_reponse:
> > in other words the polling phase can be skipped in such a case and the
> > response values accessed straight away.
> >
> > Note that all of the above applies only when polling mode of operation was
> > selected by the core: if instead a completion IRQ was found to be available
> > the normal response processing path based on completions will still be
> > followed.
>
> This might actually have to be settable on a per-message basis ideally
> since we may be transporting short lived SCMI messages for which the
> completion can be done at SMC time, and long lived SCMI messages (e.g.:
> involving a voltage change) for which we would prefer a completion
> interrupt. Jim, what do you think?
Even if the SCMI main driver could be configured this way in an
elegant manner, I'm not sure that there is a clean way of specifying
this attribute on a per-message basis. Certainly we could do this
with our own protocols, but many of our "long lived" messages are the
Perf protocol's set_level command. At any rate, let me give it some
thought.

Regards,
Jim
> --
> Florian
[unhandled content-type:application/pkcs7-signature]
\
 
 \ /
  Last update: 2021-08-25 19:18    [W:0.104 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site