On 8/24/2021 3:59 PM, Cristian Marussi wrote:

SCMI communications along TX channels can optionally be provided of a
completion interrupt; when such interrupt is not available, command
transactions should rely on polling, where the SCMI core takes care to
repeatedly evaluate the transport-specific .poll_done() function to
determine if and when a request was fully completed or timed out.

Such mechanism is already present and working on a single transfer base:
SCMI protocols can indeed enable hdr.poll_completion on specific commands
ahead of each transfer and cause that transaction to be handled with
polling.

Introduce a couple of flags to be able to enforce such polling behaviour
globally at will:

  - scmi_desc.force_polling: to statically switch the whole transport to
    polling mode.

  - scmi_chan_info.no_completion_irq: to switch a single channel dynamically
    to polling mode if at runtime is determined that no completion interrupt
    was available for such channel.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian