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mpc52xx_spi: fix clearing status register 

Before reading status register to check MODF failure, we have to clear it
first since the MODF flag will be set after initializing the spi master,
if the hardware comes up with a low SS. The processor datasheet reads:
Mode Fault flag -- bit sets if SS input goes low while SPI is configured as a
master. Flag is cleared automatically by an SPI status register read (with MODF
set) followed by a SPI control register 1 write.
Hence simply rereading the register is not sufficient to clear the flag. We
redo the write also to make sure to clear the flag.

V2 Changes:
* change variable type from int to u8

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Luotao Fu 2009-11-13 10:41:15 +01:00 committed by Grant Likely
parent 6d5355998a
commit 4a495b1c43
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/mpc52xx_spi.c
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@ -391,6 +391,7 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op,
struct mpc52xx_spi *ms;
void __iomem *regs;
int rc;
u8 ctrl1;
/* MMIO registers */
dev_dbg(&op->dev, "probing mpc5200 SPI device\n");
@ -399,7 +400,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op,
return -ENODEV;
/* initialize the device */
out_8(regs+SPI_CTRL1, SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR);
ctrl1 = SPI_CTRL1_SPIE | SPI_CTRL1_SPE | SPI_CTRL1_MSTR;
out_8(regs + SPI_CTRL1, ctrl1);
out_8(regs + SPI_CTRL2, 0x0);
out_8(regs + SPI_DATADIR, 0xe); /* Set output pins */
out_8(regs + SPI_PORTDATA, 0x8); /* Deassert /SS signal */
@ -409,6 +411,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op,
* on the SPI bus. This fault will also occur if the SPI signals
* are not connected to any pins (port_config setting) */
in_8(regs + SPI_STATUS);
out_8(regs + SPI_CTRL1, ctrl1);
in_8(regs + SPI_DATA);
if (in_8(regs + SPI_STATUS) & SPI_STATUS_MODF) {
dev_err(&op->dev, "mode fault; is port_config correct?\n");