On Sat, 16 Feb 2008 22:32:52 +0900 (JST)
Atsushi Nemoto <[EMAIL PROTECTED]> wrote:
> Here is my quick workaround for this problem. It makes all CSRn.CPOL
> match for the transfer before activating chipselect. I'm not quite
> sure my analysis is correct, and there might be better solution.
> Could you give me any comments?
I'm not sure if I fully understand what problem you're seeing. Is the
clock state wrong when the chip select is activated? If so, does the
patch below help?
Haavard
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 293b7ca..4f19b82 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -90,6 +90,7 @@ static void cs_activate(struct atmel_spi *as, struct
spi_device *spi)
mr = spi_readl(as, MR);
mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
+ spi_writel(as, MR, mr);
dev_dbg(&spi->dev, "activate %u%s, mr %08x\n",
gpio, active ? " (high)" : "",
@@ -97,7 +98,6 @@ static void cs_activate(struct atmel_spi *as, struct
spi_device *spi)
if (!(cpu_is_at91rm9200() && spi->chip_select == 0))
gpio_set_value(gpio, active);
- spi_writel(as, MR, mr);
}
static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
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