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From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: David Woodhouse <dwmw2@infradead.org>,
	Brian Norris <computersforpeace@gmail.com>,
	Marek Vasut <marek.vasut@gmail.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-mtd@lists.infradead.org
Subject: [PATCH 1/2] mtd: cfi_cmdset_0002: only check errors when ready in cfi_check_err_status()
Date: Thu, 3 Oct 2019 21:32:13 +0300
Message-ID: <146a49cc-fb1a-36cf-75b6-cf472d264c7b@cogentembedded.com> (raw)
In-Reply-To: <b93bf510-8812-3f82-29f3-43f41d08550a@cogentembedded.com>

Cypress S26K{L|S}P{128|256|512}S datasheet says that the error bits in
the status register are only valid when the "device ready" bit 7 is set.
Add the check for the device ready bit in cfi_check_err_status() as that
function isn't always called with this bit set.

Fixes: 4844ef80305d ("mtd: cfi_cmdset_0002: Add support for polling status register")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/mtd/chips/cfi_cmdset_0002.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/drivers/mtd/chips/cfi_cmdset_0002.c
===================================================================
--- linux.orig/drivers/mtd/chips/cfi_cmdset_0002.c
+++ linux/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -136,6 +136,10 @@ static void cfi_check_err_status(struct
 			 cfi->device_type, NULL);
 	status = map_read(map, adr);
 
+	/* The error bits are invalid while the chip's busy */
+	if (!map_word_bitsset(map, status, CMD(CFI_SR_DRB)))
+		return;
+
 	if (map_word_bitsset(map, status, CMD(0x3a))) {
 		unsigned long chipstatus = MERGESTATUS(status);
 

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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-03 18:29 [PATCH 0/2] Fix the HyperFlash support in the AMD/Fujitsu/Spansion CFI driver Sergei Shtylyov
2019-10-03 18:32 ` Sergei Shtylyov [this message]
2019-10-03 18:34 ` [PATCH 2/2] mtd: cfi_cmdset_0002: fix delayed error detection on HyperFlash Sergei Shtylyov
2019-10-06 20:54   ` Tokunori Ikegami
2019-10-11 12:03     ` Sergei Shtylyov
2019-10-13  3:35       ` Tokunori Ikegami
2019-10-16  6:33   ` Vignesh Raghavendra
2019-10-28 19:15     ` Sergei Shtylyov
2019-10-30 15:35       ` Vignesh Raghavendra

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