linux-kernel - [PATCH 08/13] mtd: spinand: Reject 8D-8D-8D op_templates if octal_dtr_enale() is missing in manufacturer

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Date:   Tue, 13 Jul 2021 13:05:33 +0000
From:   Apurva Nandan <a-nandan@...com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>
CC:     Apurva Nandan <a-nandan@...com>, Pratyush Yadav <p.yadav@...com>
Subject: [PATCH 08/13] mtd: spinand: Reject 8D-8D-8D op_templates if octal_dtr_enale() is missing in manufacturer_op

The SPI NAND core doesn't know how to switch the flash to Octal DTR
mode (i.e. which operations to perform). If the manufacturer hasn't
implemented the octal_dtr_enable() manufacturer_op, the SPI NAND core
wouldn't be able to switch to 8D-8D-8D mode and will also not be able
to run in 1S-1S-1S mode due to already selected 8D-8D-8D read/write
cache op_templates.

So, avoid choosing a Octal DTR SPI op_template for read_cache,
write_cache and update_cache operations, if the manufacturer_op
octal_dtr_enable() is missing.

Signed-off-by: Apurva Nandan <a-nandan@...com>
---
 drivers/mtd/nand/spi/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 19d8affac058..8711e887b795 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1028,6 +1028,8 @@ static int spinand_manufacturer_match(struct spinand_device *spinand,
 		if (id[0] != manufacturer->id)
 			continue;
 
+		spinand->manufacturer = manufacturer;
+
 		ret = spinand_match_and_init(spinand,
 					     manufacturer->chips,
 					     manufacturer->nchips,
@@ -1035,7 +1037,6 @@ static int spinand_manufacturer_match(struct spinand_device *spinand,
 		if (ret < 0)
 			continue;
 
-		spinand->manufacturer = manufacturer;
 		return 0;
 	}
 	return -ENOTSUPP;
@@ -1097,6 +1098,10 @@ spinand_select_op_variant(struct spinand_device *spinand,
 		unsigned int nbytes;
 		int ret;
 
+		if (spinand_op_is_octal_dtr(&op) &&
+		    !spinand->manufacturer->ops->octal_dtr_enable)
+			continue;
+
 		nbytes = nanddev_per_page_oobsize(nand) +
 			 nanddev_page_size(nand);
 
-- 
2.17.1