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Date:   Wed, 6 May 2020 11:11:12 +0200
From:   Christophe Kerello <christophe.kerello@...com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <gregkh@...uxfoundation.org>, <boris.brezillon@...labora.com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>, <marex@...x.de>,
        Christophe Kerello <christophe.kerello@...com>
Subject: [PATCH v4 03/10] mtd: rawnand: stm32_fmc2: use FMC2_TIMEOUT_MS for timeouts

This patch removes the constant FMC2_TIMEOUT_US.
FMC2_TIMEOUT_MS will be used each time that we need to wait (except
when the timeout value is set by the framework).

It was seen, during stress tests with the sequencer in an overloaded
system, that we could be close to 1 second, even if we never met this
value. To be safe, FMC2_TIMEOUT_MS is set to 5 seconds.

Signed-off-by: Christophe Kerello <christophe.kerello@...com>
---
Changes in v3:
 - add in the commit log the reason to increase FMC2_TIMEOUT_MS

 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 3377fbe..5778a95 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -37,8 +37,7 @@
 /* Max ECC buffer length */
 #define FMC2_MAX_ECC_BUF_LEN		(FMC2_BCHDSRS_LEN * FMC2_MAX_SG)
 
-#define FMC2_TIMEOUT_US			1000
-#define FMC2_TIMEOUT_MS			1000
+#define FMC2_TIMEOUT_MS			5000
 
 /* Timings */
 #define FMC2_THIZ			1
@@ -526,8 +525,8 @@ static int stm32_fmc2_ham_calculate(struct nand_chip *chip, const u8 *data,
 	int ret;
 
 	ret = readl_relaxed_poll_timeout(fmc2->io_base + FMC2_SR,
-					 sr, sr & FMC2_SR_NWRF, 10,
-					 FMC2_TIMEOUT_MS);
+					 sr, sr & FMC2_SR_NWRF, 1,
+					 1000 * FMC2_TIMEOUT_MS);
 	if (ret) {
 		dev_err(fmc2->dev, "ham timeout\n");
 		return ret;
@@ -1315,7 +1314,7 @@ static int stm32_fmc2_waitrdy(struct nand_chip *chip, unsigned long timeout_ms)
 	/* Check if there is no pending requests to the NAND flash */
 	if (readl_relaxed_poll_timeout_atomic(fmc2->io_base + FMC2_SR, sr,
 					      sr & FMC2_SR_NWRF, 1,
-					      FMC2_TIMEOUT_US))
+					      1000 * FMC2_TIMEOUT_MS))
 		dev_warn(fmc2->dev, "Waitrdy timeout\n");
 
 	/* Wait tWB before R/B# signal is low */
-- 
1.9.1

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