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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-18 10:56:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-18 10:56:02 -0700 |
| commit | b061c59c27e0385e53c961d9fbd18c1c078d9823 (patch) | |
| tree | 56240ef8e98e9e4712ee58aa8e6e3d51f6ab001f /drivers/spi/spi_imx.c | |
| parent | 99f4065bac7b8c3f829334b4218a5c2e68cbe440 (diff) | |
| parent | 568a60eda2e90a11bb3d7f8ef3f6800e9b60d4e5 (diff) | |
| download | linux-rt-b061c59c27e0385e53c961d9fbd18c1c078d9823.tar.gz | |
Merge branch 'spi/next' of git://git.secretlab.ca/git/linux-2.6
* 'spi/next' of git://git.secretlab.ca/git/linux-2.6: (34 commits)
spi/dw_spi: move dw_spi.h into drivers/spi
spi/dw_spi: Fix missing header
gpio/langwell: Clear edge bit before handling
gpio/langwell: Simplify demux loop
gpio/langwell: Convert irq name space
gpio/langwell: Fix broken irq_eoi change.
gpio; Make Intel chipset gpio drivers depend on x86
gpio/cs5535-gpio: Fix section mismatch
spi/rtc-{ds1390,ds3234,m41t94}: Use spi_get_drvdata() for SPI devices
spi/davinci: Support DMA transfers larger than 65535 words
spi/davinci: Use correct length parameter to dma_map_single calls
gpio: Use __devexit at necessary places
gpio: add MODULE_DEVICE_TABLE to pch_gpio and ml_ioh_gpio
gpio/mcp23s08: support mcp23s17 variant
of_mmc_spi: add card detect irq support
spi/omap_mcspi: catch xfers of non-multiple SPI word size
spi/omap_mcspi: Off-by-one error in finding the right divisor
gpio/pca953x: Fix wrong pointer type
spi/pl022: rid dangling labels
spi: add support for SuperH SPI
...
Diffstat (limited to 'drivers/spi/spi_imx.c')
| -rw-r--r-- | drivers/spi/spi_imx.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 1cf9d5faabf4..69d6dba67c19 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -174,7 +174,7 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin, #define SPI_IMX2_3_CTRL 0x08 #define SPI_IMX2_3_CTRL_ENABLE (1 << 0) #define SPI_IMX2_3_CTRL_XCH (1 << 2) -#define SPI_IMX2_3_CTRL_MODE(cs) (1 << ((cs) + 4)) +#define SPI_IMX2_3_CTRL_MODE_MASK (0xf << 4) #define SPI_IMX2_3_CTRL_POSTDIV_OFFSET 8 #define SPI_IMX2_3_CTRL_PREDIV_OFFSET 12 #define SPI_IMX2_3_CTRL_CS(cs) ((cs) << 18) @@ -253,8 +253,14 @@ static int __maybe_unused spi_imx2_3_config(struct spi_imx_data *spi_imx, { u32 ctrl = SPI_IMX2_3_CTRL_ENABLE, cfg = 0; - /* set master mode */ - ctrl |= SPI_IMX2_3_CTRL_MODE(config->cs); + /* + * The hardware seems to have a race condition when changing modes. The + * current assumption is that the selection of the channel arrives + * earlier in the hardware than the mode bits when they are written at + * the same time. + * So set master mode for all channels as we do not support slave mode. + */ + ctrl |= SPI_IMX2_3_CTRL_MODE_MASK; /* set clock speed */ ctrl |= spi_imx2_3_clkdiv(spi_imx->spi_clk, config->speed_hz); |