linux-kernel - [PATCH v3 2/2] mailbox: pcc: add peek

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Message-ID: <20251202101215.2240024-2-andrea.tomassetti@sipearl.com>
Date: Tue, 2 Dec 2025 11:12:15 +0100
From: Andrea Tomassetti <andrea.tomassetti@...earl.com>
To: <sudeep.holla@....com>
CC: <andrea.tomassetti@...earl.com>, <jassisinghbrar@...il.com>,
	<lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <lkp@...el.com>,
	<oe-kbuild-all@...ts.linux.dev>, <olivier.dautricourt@...earl.com>,
	<olivierdautricourt@...il.com>, <rafael@...nel.org>,
	<thibault.cantori@...earl.com>
Subject: [PATCH v3 2/2] mailbox: pcc: add peek_data handler

peek_data is mapped to pcc_mbox_error_check_and_clear, so that it
returns true if no error occurred while the platform processed last
message, and therefore clients can fetch response data provided by the
platform.

Tested-by: Thibault Cantori <thibault.cantori@...earl.com>
Co-developed-by: Olivier Dautricourt <olivier.dautricourt@...earl.com>
Signed-off-by: Olivier Dautricourt <olivier.dautricourt@...earl.com>
Signed-off-by: Andrea Tomassetti <andrea.tomassetti@...earl.com>
---
 drivers/mailbox/pcc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index 418007020439..ccd50b33409b 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -502,11 +502,17 @@ static void pcc_shutdown(struct mbox_chan *chan)
 		devm_free_irq(chan->mbox->dev, pchan->plat_irq, chan);
 }
 
+static bool pcc_peek_data(struct mbox_chan *chan)
+{
+	return pcc_mbox_error_check_and_clear(chan->con_priv) == 0;
+}
+
 static const struct mbox_chan_ops pcc_chan_ops = {
 	.send_data = pcc_send_data,
 	.startup = pcc_startup,
 	.shutdown = pcc_shutdown,
 	.last_tx_done = pcc_last_tx_done,
+	.peek_data = pcc_peek_data,
 };
 
 /**
-- 
2.51.2