Re: [PATCH v4 2/2] firmware: arm_scmi: Augment SMC/HVC to allow optional interrupt

[Florian Fainelli]

On 12/22/2020 6:56 AM, Jim Quinlan wrote:
> The SMC/HVC SCMI transport is modified to allow the completion of an SCMI
> message to be indicated by an interrupt rather than the return of the smc
> call.  This accommodates the existing behavior of the BrcmSTB SCMI
> "platform" whose SW is already out in the field and cannot be changed.
> 
> Signed-off-by: Jim Quinlan <jim2101024@xxxxxxxxx>

This looks good to me, just one question below:

[snip]

> @@ -111,6 +145,8 @@ static int smc_send_message(struct scmi_chan_info *cinfo,
>  	shmem_tx_prepare(scmi_info->shmem, xfer);
>  
>  	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
> +	if (scmi_info->irq)
> +		wait_for_completion(&scmi_info->tx_complete);

Do we need this to have a preceding call to reinit_completion()? It does
not look like this is going to make any practical difference but there
are drivers doing that for correctness.
-- 
Florian