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spi: kirkwood_spi: implement workaround for FE-9144572

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Erratum NO. FE-9144572: The device SPI interface supports frequencies of
up to 50 MHz.  However, due to this erratum, when the device core clock
is 250 MHz and the SPI interfaces is configured for 50MHz SPI clock and
CPOL=CPHA=1 there might occur data corruption on reads from the SPI
device.

Implement the workaround by setting the TMISO_SAMPLE value to 0x2
in the timing1 register.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Chris Packham
2018-01-22 22:44:20 +13:00
committed by Jagan Teki
parent 36890ff0d0
commit df16881cea
2 changed files with 72 additions and 3 deletions
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6
arch/arm/include/asm/arch-mvebu/spi.h
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@@ -57,6 +57,12 @@ struct kwspi_registers {
#define KWSPI_TXLSBF (1 << 13)
#define KWSPI_RXLSBF (1 << 14)
/* Timing Parameters 1 Register */
#define KW_SPI_TMISO_SAMPLE_OFFSET 6
#define KW_SPI_TMISO_SAMPLE_MASK (0x3 << KW_SPI_TMISO_SAMPLE_OFFSET)
#define KW_SPI_TMISO_SAMPLE_1 (1 << KW_SPI_TMISO_SAMPLE_OFFSET)
#define KW_SPI_TMISO_SAMPLE_2 (2 << KW_SPI_TMISO_SAMPLE_OFFSET)
#define KWSPI_IRQUNMASK 1 /* unmask SPI interrupt */
#define KWSPI_IRQMASK 0 /* mask SPI interrupt */
#define KWSPI_SMEMRDIRQ 1 /* SerMem data xfer ready irq */