linux-kernel - [RFC PATCH v2 03/12] mtd: spinand: perform controller tuning during probe

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Message-ID: <20260113141617.1905039-4-s-k6@ti.com>
Date: Tue, 13 Jan 2026 19:46:08 +0530
From: Santhosh Kumar K <s-k6@...com>
To: <broonie@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <miquel.raynal@...tlin.com>, <richard@....at>,
	<vigneshr@...com>, <tudor.ambarus@...aro.org>, <pratyush@...nel.org>,
	<mwalle@...nel.org>
CC: <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<praneeth@...com>, <u-kumar1@...com>, <p-mantena@...com>, <a-dutta@...com>,
	<s-k6@...com>
Subject: [RFC PATCH v2 03/12] mtd: spinand: perform controller tuning during probe

SPI controllers may need tuning for reliable high-speed operation.
Without it, controllers use conservative timing that limits performance.

Call spi_mem_execute_tuning() during probe to optimize timing for
the device's read and write operations. Failures are non-fatal as
controllers fall back to default timing.

Signed-off-by: Santhosh Kumar K <s-k6@...com>
---
 drivers/mtd/nand/spi/core.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 0346916b032b..2a45d1047736 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1658,6 +1658,7 @@ static int spinand_probe(struct spi_mem *mem)
 {
 	struct spinand_device *spinand;
 	struct mtd_info *mtd;
+	struct spi_mem_op read_op, write_op;
 	int ret;
 
 	spinand = devm_kzalloc(&mem->spi->dev, sizeof(*spinand),
@@ -1676,6 +1677,19 @@ static int spinand_probe(struct spi_mem *mem)
 	if (ret)
 		return ret;
 
+	read_op = *spinand->op_templates.read_cache;
+	write_op = *spinand->op_templates.write_cache;
+
+	ret = spi_mem_execute_tuning(mem, &read_op, &write_op);
+	if (ret && ret != -EOPNOTSUPP) {
+		dev_warn(&mem->spi->dev, "Failed to execute PHY tuning: %d\n",
+			 ret);
+		/*
+		 * Tuning failure is non-fatal; the controller falls back to
+		 * default timing, reducing speed but ensuring operation.
+		 */
+	}
+
 	ret = mtd_device_register(mtd, NULL, 0);
 	if (ret)
 		goto err_spinand_cleanup;
-- 
2.34.1