- * pcc_tx_done - Callback from Mailbox controller code to
- * check if PCC message transmission completed.
- * @chan: Pointer to Mailbox channel on which previous
- * transmission occurred.
- *
- * Return: TRUE if succeeded.
- */
-static bool pcc_tx_done(struct mbox_chan *chan)
-{
- struct acpi_pcct_hw_reduced *pcct_ss = chan->con_priv;
- struct acpi_pcct_shared_memory *generic_comm_base =
- (struct acpi_pcct_shared_memory *) pcct_ss->base_address;
- u16 cmd_delay = pcct_ss->latency;
- unsigned int retries = 0;
-
- /* Try a few times while waiting for platform to consume */
- while (!(readw_relaxed(&generic_comm_base->status)
- & PCC_CMD_COMPLETE)) {
-
- if (retries++ < 5)
- udelay(cmd_delay);
- else {
- /*
- * If the remote is dead, this will cause the Mbox
- * controller to timeout after mbox client.tx_tout
- * msecs.
- */
- pr_err("PCC platform did not respond.\n");
- return false;
- }
- }
- return true;
-}
-
-/**
- * pcc_send_data - Called from Mailbox Controller code to finally
- * transmit data over channel.
+ * pcc_send_data - Called from Mailbox Controller code. Used
+ * here only to ring the channel doorbell. The PCC client
+ * specific read/write is done in the client driver in
+ * order to maintain atomicity over PCC channel once
+ * OS has control over it. See above for flow of operations.