diff options
| author | Chris Packham <[email protected]> | 2018-01-22 22:44:20 +1300 |
|---|---|---|
| committer | Jagan Teki <[email protected]> | 2018-01-24 12:04:08 +0530 |
| commit | df16881cea50a787c37591bd2168c8ea656217bd (patch) | |
| tree | 224a6147fba7fc48c08f87557262df29a4af37d7 /arch | |
| parent | 36890ff0d00f6c44631a6453b355f8af1b5ddd53 (diff) | |
spi: kirkwood_spi: implement workaround for FE-9144572
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 <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/arch-mvebu/spi.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-mvebu/spi.h b/arch/arm/include/asm/arch-mvebu/spi.h index 3545aed1734..1de510ea6da 100644 --- a/arch/arm/include/asm/arch-mvebu/spi.h +++ b/arch/arm/include/asm/arch-mvebu/spi.h @@ -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 */ |