linux-kernel - [PATCH 4.19 010/361] spi: bcm-qspi: switch back to reading flash using smaller chunks

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Date:   Sun, 11 Nov 2018 14:15:57 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.19 010/361] spi: bcm-qspi: switch back to reading flash using smaller chunks

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

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

From: Rafał Miłecki <rafal@...ecki.pl>

commit 940ec770c295682993d1cccce3081fd7c74fece8 upstream.

Fixing/optimizing bcm_qspi_bspi_read() performance introduced two
changes:
1) It added a loop to read all requested data using multiple BSPI ops.
2) It bumped max size of a single BSPI block request from 256 to 512 B.

The later change resulted in occasional BSPI timeouts causing a
regression.

For some unknown reason hardware doesn't always handle reads as expected
when using 512 B chunks. In such cases it may happen that BSPI returns
amount of requested bytes without the last 1-3 ones. It provides the
remaining bytes later but doesn't raise an interrupt until another LR
start.

Switching back to 256 B reads fixes that problem and regression.

Fixes: 345309fa7c0c ("spi: bcm-qspi: Fix bcm_qspi_bspi_read() performance")
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-bcm-qspi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -89,7 +89,7 @@
 #define BSPI_BPP_MODE_SELECT_MASK		BIT(8)
 #define BSPI_BPP_ADDR_SELECT_MASK		BIT(16)

-#define BSPI_READ_LENGTH			512
+#define BSPI_READ_LENGTH			256

 /* MSPI register offsets */
 #define MSPI_SPCR0_LSB				0x000