[PATCH V2 12/20] i3c: mipi-i3c-hci: Refactor PIO register initialization

From: Adrian Hunter <adrian.hunter@intel.com>
To: alexandre.belloni@bootlin.com
Cc: Frank.Li@nxp.com, Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Aniket <aniketmaurya@google.com>,
	linux-i3c@lists.infradead.org
Subject: [PATCH V2 12/20] i3c: mipi-i3c-hci: Refactor PIO register initialization
Date: Thu,  8 Jan 2026 10:05:50 +0200	[thread overview]
Message-ID: <20260108080558.21767-13-adrian.hunter@intel.com> (raw)
In-Reply-To: <20260108080558.21767-1-adrian.hunter@intel.com>

Move the PIO register setup logic out of hci_pio_init() into a new
helper, __hci_pio_init().  This refactoring prepares for Runtime PM
support by allowing PIO registers to be reinitialized independently
after resume.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---


Changes in V2:

	Add Frank's Rev'd-by


 drivers/i3c/master/mipi-i3c-hci/pio.c | 45 +++++++++++++++++----------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/drivers/i3c/master/mipi-i3c-hci/pio.c b/drivers/i3c/master/mipi-i3c-hci/pio.c
index 3d633abf6099..52d9f01d9ca9 100644
--- a/drivers/i3c/master/mipi-i3c-hci/pio.c
+++ b/drivers/i3c/master/mipi-i3c-hci/pio.c
@@ -135,27 +135,14 @@ struct hci_pio_data {
 	u32 enabled_irqs;
 };
 
-static int hci_pio_init(struct i3c_hci *hci)
+static void __hci_pio_init(struct i3c_hci *hci, u32 *size_val_ptr)
 {
-	struct hci_pio_data *pio;
 	u32 val, size_val, rx_thresh, tx_thresh, ibi_val;
-
-	pio = devm_kzalloc(hci->master.dev.parent, sizeof(*pio), GFP_KERNEL);
-	if (!pio)
-		return -ENOMEM;
-
-	hci->io_data = pio;
-	spin_lock_init(&pio->lock);
+	struct hci_pio_data *pio = hci->io_data;
 
 	size_val = pio_reg_read(QUEUE_SIZE);
-	dev_dbg(&hci->master.dev, "CMD/RESP FIFO = %ld entries\n",
-		FIELD_GET(CR_QUEUE_SIZE, size_val));
-	dev_dbg(&hci->master.dev, "IBI FIFO = %ld bytes\n",
-		4 * FIELD_GET(IBI_STATUS_SIZE, size_val));
-	dev_dbg(&hci->master.dev, "RX data FIFO = %d bytes\n",
-		4 * (2 << FIELD_GET(RX_DATA_BUFFER_SIZE, size_val)));
-	dev_dbg(&hci->master.dev, "TX data FIFO = %d bytes\n",
-		4 * (2 << FIELD_GET(TX_DATA_BUFFER_SIZE, size_val)));
+	if (size_val_ptr)
+		*size_val_ptr = size_val;
 
 	/*
 	 * Let's initialize data thresholds to half of the actual FIFO size.
@@ -201,6 +188,30 @@ static int hci_pio_init(struct i3c_hci *hci)
 
 	/* Always accept error interrupts (will be activated on first xfer) */
 	pio->enabled_irqs = STAT_ALL_ERRORS;
+}
+
+static int hci_pio_init(struct i3c_hci *hci)
+{
+	struct hci_pio_data *pio;
+	u32 size_val;
+
+	pio = devm_kzalloc(hci->master.dev.parent, sizeof(*pio), GFP_KERNEL);
+	if (!pio)
+		return -ENOMEM;
+
+	hci->io_data = pio;
+	spin_lock_init(&pio->lock);
+
+	__hci_pio_init(hci, &size_val);
+
+	dev_dbg(&hci->master.dev, "CMD/RESP FIFO = %ld entries\n",
+		FIELD_GET(CR_QUEUE_SIZE, size_val));
+	dev_dbg(&hci->master.dev, "IBI FIFO = %ld bytes\n",
+		4 * FIELD_GET(IBI_STATUS_SIZE, size_val));
+	dev_dbg(&hci->master.dev, "RX data FIFO = %d bytes\n",
+		4 * (2 << FIELD_GET(RX_DATA_BUFFER_SIZE, size_val)));
+	dev_dbg(&hci->master.dev, "TX data FIFO = %d bytes\n",
+		4 * (2 << FIELD_GET(TX_DATA_BUFFER_SIZE, size_val)));
 
 	return 0;
 }
-- 
2.51.0


-- 
linux-i3c mailing list
linux-i3c@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-i3c
