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From: Tokunori Ikegami <ikegami.t@gmail.com>
To: Vignesh Raghavendra <vigneshr@ti.com>
Cc: Tokunori Ikegami <ikegami.t@gmail.com>,
	Chris Packham <chris.packham@alliedtelesis.co.nz>,
	linux-mtd@lists.infradead.org, Fabio Bettoni <fbettoni@gmail.com>,
	Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Subject: [PATCH v8 8/9] mtd: cfi_cmdset_0002: Split do_write_oneword() to reduce exit paths
Date: Tue,  6 Aug 2019 04:03:25 +0900	[thread overview]
Message-ID: <20190805190326.28772-9-ikegami.t@gmail.com> (raw)
In-Reply-To: <20190805190326.28772-1-ikegami.t@gmail.com>

The do_write_oneword_done() is called twice at the exit paths.
By splitting the retry functionality it can be reduced to call once.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
Cc: Fabio Bettoni <fbettoni@gmail.com>
Co: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
Cc: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Cc: linux-mtd@lists.infradead.org
---
Changes since v7:
- None.

Changes since v6:
- Removed the tag of Koen Vandeputte as same with the v7 1/9 patch.
- Address the ./scripts/checkpatch.pl issue.

Changes since v5:
- Rebased on top of Liu Jian's fixes in master.
- Change the email address of Tokunori Ikegami to ikegami.t@gmail.com.

Changes since v4:
- None.

Changes since v3:
- Just change the email address of Tokunori Ikegami to ikegami_to@yahoo.co.jp.

Changes since v2:
- Add the patch.

 drivers/mtd/chips/cfi_cmdset_0002.c | 38 +++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 2ab0dd0b11be..6f6fadb54e5e 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -1738,25 +1738,16 @@ static void __xipram do_write_oneword_done(struct map_info *map,
 	mutex_unlock(&chip->mutex);
 }
 
-static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
-				     unsigned long adr, map_word datum,
-				     int mode)
+static int __xipram do_write_oneword_retry(struct map_info *map,
+					   struct flchip *chip,
+					   unsigned long adr, map_word datum,
+					   int mode)
 {
 	struct cfi_private *cfi = map->fldrv_priv;
 	int ret = 0;
 	map_word oldd;
 	int retry_cnt = 0;
 
-	adr += chip->start;
-
-	pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr,
-		 datum.x[0]);
-
-	ret = do_write_oneword_start(map, chip, adr, mode);
-	if (ret) {
-		return ret;
-	}
-
 	/*
 	 * Check for a NOP for the case when the datum to write is already
 	 * present - it saves time and works around buggy chips that corrupt
@@ -1766,7 +1757,6 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
 	oldd = map_read(map, adr);
 	if (map_word_equal(map, oldd, datum)) {
 		pr_debug("MTD %s(): NOP\n", __func__);
-		do_write_oneword_done(map, chip, adr, mode);
 		return ret;
 	}
 
@@ -1789,6 +1779,26 @@ static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
 	}
 	xip_enable(map, chip, adr);
 
+	return ret;
+}
+
+static int __xipram do_write_oneword(struct map_info *map, struct flchip *chip,
+				     unsigned long adr, map_word datum,
+				     int mode)
+{
+	int ret = 0;
+
+	adr += chip->start;
+
+	pr_debug("MTD %s(): WRITE 0x%.8lx(0x%.8lx)\n", __func__, adr,
+		 datum.x[0]);
+
+	ret = do_write_oneword_start(map, chip, adr, mode);
+	if (ret)
+		return ret;
+
+	ret = do_write_oneword_retry(map, chip, adr, datum, mode);
+
 	do_write_oneword_done(map, chip, adr, mode);
 
 	return ret;
-- 
2.11.0


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  parent reply	other threads:[~2019-08-05 19:05 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-05 19:03 [PATCH v8 0/9] mtd: cfi_cmdset_0002: Fix flash write issue for OpenWrt Project Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 1/9] mtd: cfi_cmdset_0002: Use chip_good() to retry in do_write_oneword() Tokunori Ikegami
2019-08-06  0:43   ` Sasha Levin
2019-08-06 14:30     ` Tokunori Ikegami
2019-09-17 18:04       ` Tokunori Ikegami
2019-09-18  5:29         ` Vignesh Raghavendra
2019-09-18 13:40           ` Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 2/9] mtd: cfi_cmdset_0002: Remove goto statement from do_write_buffer() Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 3/9] mtd: cfi_cmdset_0002: Split do_write_oneword() to reduce function size Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 4/9] mtd: cfi_cmdset_0002: Split do_write_oneword() op_done goto statement Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 5/9] mtd: cfi_cmdset_0002: Remove op_done goto statement from do_write_oneword() Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 6/9] mtd: cfi_cmdset_0002: Split write-to-buffer-reset sequence Tokunori Ikegami
2019-08-05 19:03 ` [PATCH v8 7/9] mtd: cfi_cmdset_0002: Split to wait write buffer to check if completed Tokunori Ikegami
2019-08-05 19:03 ` Tokunori Ikegami [this message]
2019-08-05 19:03 ` [PATCH v8 9/9] mtd: cfi_cmdset_0002: Disable write buffer functions if FORCE_WORD_WRITE is 1 Tokunori Ikegami
2019-09-17  4:20 ` [PATCH v8 0/9] mtd: cfi_cmdset_0002: Fix flash write issue for OpenWrt Project Vignesh Raghavendra

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