Hi,
On Mon, Nov 23, 2020 at 11:32 PM Maulik Shah <mkshah@xxxxxxxxxxxxxx> wrote:
>
> @@ -423,8 +422,7 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
> cmd = &req->cmds[j];
> sts = read_tcs_cmd(drv, RSC_DRV_CMD_STATUS, i, j);
> if (!(sts & CMD_STATUS_ISSUED) ||
> - ((req->wait_for_compl || cmd->wait) &&
> - !(sts & CMD_STATUS_COMPL))) {
> + (cmd->wait && !(sts & CMD_STATUS_COMPL))) {
> pr_err("Incomplete request: %s: addr=%#x data=%#x",
> drv->name, cmd->addr, cmd->data);
> err = -EIO;
In my review of v1 all those months ago, the way we left things was
that I disagreed with this part of the patch, and I still do. I think
you should leave things the way they were in tcs_tx_done(). Copying
my un-responded-to comments from v1 here for you:
In your patch in __tcs_buffer_write(), if "wait_for_compl" is set then
"CMD_MSGID_RESP_REQ" will be added for every message in the request,
right? That's because you have this bit of code:
/* Convert all commands to RR when the request has wait_for_compl set */
cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0;
That means that if _either_ "cmd->wait" or "req->wait_for_compl" is
set then you expect the "sts" to have "CMD_STATUS_COMPL", right?
That's exactly the code that used to be there.
Said another way, if "req->wait_for_compl" was set then it's an error
if any of our commands are missing the "CMD_STATUS_COMPL" bit, right?
> @@ -30,7 +30,7 @@ enum rpmh_state {
> *
> * @addr: the address of the resource slv_id:18:16 | offset:0:15
> * @data: the resource state request
> - * @wait: wait for this request to be complete before sending the next
> + * @wait: ensure that this command is complete before returning
In my response to v1 I suggested that a comment would be nice here.
Something akin to:
Setting "wait" here only makes sense in the batch case for active-only
transfers.
This is because:
* rpmh_write_async() - There's no callback and rpmh_write_async()
doesn't set the "completion" to anything so there's nobody that cares
at all
* DEFINE_RPMH_MSG_ONSTACK - always sets wait_for_compl.
-Doug
