linux-kernel - [PATCH 1/1] mtd: cfi_cmdset_0002:add fixup for Micron M29EW after erase operation

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Date:	Mon, 1 Sep 2014 02:20:52 +0000
From:	bpqw <bpqw@...ron.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>
CC:	Christian Riesch <christian.riesch@...cron.at>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jingoo Han <jg1.han@...sung.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] mtd: cfi_cmdset_0002:add fixup for Micron M29EW after
 erase operation

For Micron M29EW,20ms delay is needed after erase operation.

Signed-off-by: BeanHuo <bpqw@...ron.com>
---
 drivers/mtd/chips/cfi_cmdset_0002.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 5a4bfe3..9b0de91 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -509,6 +509,16 @@ static void cfi_fixup_m29ew_delay_after_resume(struct cfi_private *cfi)
 		cfi_udelay(500);
 }
 
+static void cfi_fixup_m29ew_delay_after_erase(struct cfi_private *cfi) 
+{
+	/*
+	 * Resolving the Delay After ERASE Issue @low temperature.
+	 * 20ms delay is needed after erase operation.
+	 */
+	if (is_m29ew(cfi))
+		cfi_udelay(20000);
+}
+
 struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)  {
 	struct cfi_private *cfi = map->fldrv_priv; @@ -2397,6 +2407,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 		ret = -EIO;
 	}
 
+	cfi_fixup_m29ew_delay_after_erase(cfi);
 	chip->state = FL_READY;
 	DISABLE_VPP(map);
 	put_chip(map, chip, adr);
--
1.7.9.5
--
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