- patches.arch/x86_mce_intel_decode_physical_address.patch:

[linux-flexiantxendom0-3.2.10.git] / drivers / spi / davinci_spi.c

diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index 95afb6b..b85090c 100644 (file)
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -301,7 +301,7 @@ static int davinci_spi_setup_transfer(struct spi_device *spi,
        struct davinci_spi *davinci_spi;
        struct davinci_spi_platform_data *pdata;
        u8 bits_per_word = 0;
-       u32 hz = 0, prescale;
+       u32 hz = 0, prescale = 0, clkspeed;
 
        davinci_spi = spi_master_get_devdata(spi->master);
        pdata = davinci_spi->pdata;
@@ -338,10 +338,16 @@ static int davinci_spi_setup_transfer(struct spi_device *spi,
        set_fmt_bits(davinci_spi->base, bits_per_word & 0x1f,
                        spi->chip_select);
 
-       prescale = ((clk_get_rate(davinci_spi->clk) / hz) - 1) & 0xff;
+       clkspeed = clk_get_rate(davinci_spi->clk);
+       if (hz > clkspeed / 2)
+               prescale = 1 << 8;
+       if (hz < clkspeed / 256)
+               prescale = 255 << 8;
+       if (!prescale)
+               prescale = ((clkspeed / hz - 1) << 8) & 0x0000ff00;
 
        clear_fmt_bits(davinci_spi->base, 0x0000ff00, spi->chip_select);
-       set_fmt_bits(davinci_spi->base, prescale << 8, spi->chip_select);
+       set_fmt_bits(davinci_spi->base, prescale, spi->chip_select);
 
        return 0;
 }