linux-kernel - [RFC PATCH 3/6] mtd: spi-nor: core: run calibration when initialization is done

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Date:   Fri, 12 Mar 2021 00:42:13 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>
CC:     Pratyush Yadav <p.yadav@...com>, Lokesh Vutla <lokeshvutla@...com>
Subject: [RFC PATCH 3/6] mtd: spi-nor: core: run calibration when initialization is done

Once the flash is initialized tell the controller it can run
calibration procedures if needed. This can be useful when calibration is
needed to run at higher clock speeds.

Signed-off-by: Pratyush Yadav <p.yadav@...com>
---
 drivers/mtd/spi-nor/core.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 88888df009f0..e0cbcaf1be89 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3650,6 +3650,7 @@ static int spi_nor_probe(struct spi_mem *spimem)
 	 * checking what's really supported using spi_mem_supports_op().
 	 */
 	const struct spi_nor_hwcaps hwcaps = { .mask = SNOR_HWCAPS_ALL };
+	struct spi_mem_op op;
 	char *flash_name;
 	int ret;
 
@@ -3709,8 +3710,15 @@ static int spi_nor_probe(struct spi_mem *spimem)
 	if (ret)
 		return ret;
 
-	return mtd_device_register(&nor->mtd, data ? data->parts : NULL,
-				   data ? data->nr_parts : 0);
+	ret = mtd_device_register(&nor->mtd, data ? data->parts : NULL,
+				  data ? data->nr_parts : 0);
+	if (ret)
+		return ret;
+
+	op = spi_nor_spimem_get_read_op(nor);
+	spi_mem_do_calibration(nor->spimem, &op);
+
+	return 0;
 }
 
 static int spi_nor_remove(struct spi_mem *spimem)
-- 
2.30.0