linux-kernel - [PATCH 4.12 02/22] mtd: nand: hynix: add support for 20nm NAND chips

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Date:   Tue, 12 Sep 2017 09:59:37 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH 4.12 02/22] mtd: nand: hynix: add support for 20nm NAND chips

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

commit fd213b5bae800dc00a2930dcd07f63ab9bbff3f9 upstream.

According to the datasheet of the H27UCG8T2BTR the NAND Technology field
(6th byte of the "Device Identifier Description", bits 0-2) the
following values are possible:
- 0x0 = 48nm
- 0x1 = 41nm
- 0x2 = 32nm
- 0x3 = 26nm
- 0x4 = 20nm
- (all others are reserved)

Fix this by extending the mask for this field to allow detecting value
0x4 (20nm) as valid NAND technology.
Without this the detection of the ECC requirements fails, because the
code assumes that the device is a 48nm device (0x4 & 0x3 = 0x0) and
aborts with "Invalid ECC requirements" because it cannot map the "ECC
Level". Extending the mask makes the ECC requirement detection code
recognize this chip as <= 26nm and sets up the ECC step size and ECC
strength correctly.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Fixes: 78f3482d7480 ("mtd: nand: hynix: Rework NAND ID decoding to extract more information")
Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/nand_hynix.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mtd/nand/nand_hynix.c
+++ b/drivers/mtd/nand/nand_hynix.c
@@ -477,7 +477,7 @@ static void hynix_nand_extract_ecc_requi
 		 * The ECC requirements field meaning depends on the
 		 * NAND technology.
 		 */
-		u8 nand_tech = chip->id.data[5] & 0x3;
+		u8 nand_tech = chip->id.data[5] & 0x7;
 
 		if (nand_tech < 3) {
 			/* > 26nm, reference: H27UBG8T2A datasheet */
@@ -533,7 +533,7 @@ static void hynix_nand_extract_scramblin
 		if (nand_tech > 0)
 			chip->options |= NAND_NEED_SCRAMBLING;
 	} else {
-		nand_tech = chip->id.data[5] & 0x3;
+		nand_tech = chip->id.data[5] & 0x7;
 
 		/* < 32nm */
 		if (nand_tech > 2)