linux-kernel - [PATCH] brcmnand: Clear EXT_ADDR error registers in PIO mode

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Date:	Mon, 16 Nov 2015 22:05:39 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-mtd@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kevin Cernekee <cernekee@...il.com>
Subject: [PATCH] brcmnand: Clear EXT_ADDR error registers in PIO mode

If an error occurs in flash above 4GB in PIO mode then the EXT_ADDR
registers will be set to the location of the error and never cleared.

Reset them to 0 before reading.

Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
---
 drivers/mtd/nand/brcmnand/brcmnand.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
index 12c6190..2c8f67f 100644
--- a/drivers/mtd/nand/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/brcmnand/brcmnand.c
@@ -1400,6 +1400,8 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
 	/* Clear error addresses */
 	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
 	brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
+	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
+	brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);
 
 	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
 			(host->cs << 16) | ((addr >> 32) & 0xffff));
-- 
2.1.4

-- 
Simon Arlott
--
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