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spi: xilinx_spi: Perform software reset during slave setup

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to make sure it is in the clear state.

Signed-off-by: Jason Wu <huanyu@xilinx.com>
This commit is contained in:
Jason Wu 2012-11-23 15:05:08 +10:00 committed by Michal Simek
parent 9fc6a06ad3
commit 85e9c65f8a
2 changed files with 5 additions and 0 deletions
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2
drivers/spi/xilinx_spi.c
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@ -99,6 +99,8 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
debug("%s: bus:%i cs:%i base:%p mode:%x max_hz:%d\n", __func__, debug("%s: bus:%i cs:%i base:%p mode:%x max_hz:%d\n", __func__,
bus, cs, xilspi->regs, xilspi->mode, xilspi->freq); bus, cs, xilspi->regs, xilspi->mode, xilspi->freq);
writel(SPISSR_RESET_VALUE, &xilspi->regs->srr);
return &xilspi->slave; return &xilspi->slave;
} }

3
drivers/spi/xilinx_spi.h
View File

@ -119,6 +119,9 @@ struct xilinx_spi_reg {
#define SPIRFOR_OCYVAL_POS 0 #define SPIRFOR_OCYVAL_POS 0
#define SPIRFOR_OCYVAL_MASK (0xf << SPIRFOR_OCYVAL_POS) #define SPIRFOR_OCYVAL_MASK (0xf << SPIRFOR_OCYVAL_POS)
/* SPI Software Reset Register (ssr) */
#define SPISSR_RESET_VALUE 0x0a
struct xilinx_spi_slave { struct xilinx_spi_slave {
struct spi_slave slave; struct spi_slave slave;
struct xilinx_spi_reg *regs; struct xilinx_spi_reg *regs;