linux-kernel - [PATCH] mtd: rawnand: call onfi_fill_data_interface() once again after nand

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Date:   Thu,  7 Feb 2019 18:57:56 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-mtd@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Brian Norris <computersforpeace@...il.com>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Boris Brezillon <bbrezillon@...nel.org>
Subject: [PATCH] mtd: rawnand: call onfi_fill_data_interface() once again after nand_detect

nand_scan_ident() calls onfi_fill_data_interface() at its entry
to set up the initial timing parameters.

The timing parameters are needed not only for ->setup_data_interface(),
but also for giving the correct delay to NAND_OP_WAIT_RDY, for example.

If the driver sets the NAND_KEEP_TIMINGS flag, or does not support
->setup_data_interface() hook, those parameters will never updated.

Before nand_detect(), we never know whether the chip is ONFi or not.
So, onfi_fill_data_interface() has to assume the worst case, i.e.
non-ONFi.

After nand_detect(), if the chip turns out to be ONFi-compliant,
we can optimize tPROG_max, tBERS_max, etc.

Call onfi_fill_data_interface() once again.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 drivers/mtd/nand/raw/nand_base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 9b3d7ff..35e543c 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5040,6 +5040,9 @@ static int nand_scan_ident(struct nand_chip *chip, unsigned int maxchips,
 
 	nand_deselect_target(chip);
 
+	/* If the chip turns out ONFi, we can optimize timing parameters. */
+	onfi_fill_data_interface(chip, NAND_SDR_IFACE, 0);
+
 	/* Check for a chip array */
 	for (i = 1; i < maxchips; i++) {
 		u8 id[2];
-- 
2.7.4