linux-kernel - [PATCH 4.14 153/193] spi-nor: intel-spi: Fix broken software sequencing codes

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Message-Id: <20171128100620.824612204@linuxfoundation.org>
Date:   Tue, 28 Nov 2017 11:26:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bin Meng <bmeng.cn@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Subject: [PATCH 4.14 153/193] spi-nor: intel-spi: Fix broken software sequencing codes

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bin Meng <bmeng.cn@...il.com>

commit 9d63f17661e25fd28714dac94bdebc4ff5b75f09 upstream.

There are two bugs in current intel_spi_sw_cycle():

- The 'data byte count' field should be the number of bytes
  transferred minus 1
- SSFSTS_CTL is the offset from ispi->sregs, not ispi->base

Signed-off-by: Bin Meng <bmeng.cn@...il.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/spi-nor/intel-spi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mtd/spi-nor/intel-spi.c
+++ b/drivers/mtd/spi-nor/intel-spi.c
@@ -422,7 +422,7 @@ static int intel_spi_sw_cycle(struct int
 	if (ret < 0)
 		return ret;
 
-	val = (len << SSFSTS_CTL_DBC_SHIFT) | SSFSTS_CTL_DS;
+	val = ((len - 1) << SSFSTS_CTL_DBC_SHIFT) | SSFSTS_CTL_DS;
 	val |= ret << SSFSTS_CTL_COP_SHIFT;
 	val |= SSFSTS_CTL_FCERR | SSFSTS_CTL_FDONE;
 	val |= SSFSTS_CTL_SCGO;
@@ -432,7 +432,7 @@ static int intel_spi_sw_cycle(struct int
 	if (ret)
 		return ret;
 
-	status = readl(ispi->base + SSFSTS_CTL);
+	status = readl(ispi->sregs + SSFSTS_CTL);
 	if (status & SSFSTS_CTL_FCERR)
 		return -EIO;
 	else if (status & SSFSTS_CTL_AEL)