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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2013-03-05 12:05:17 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-03-12 18:30:56 +0000 |
| commit | 0054e28dc9d2d7c43b569ed5d491bc8bc2f903a9 (patch) | |
| tree | 90e0c1c28f991899c9a3adbebacb6da3c36165fc /drivers/spi/spi-pxa2xx.c | |
| parent | c134634077942404a285f6b64bc1ce5932ac22fe (diff) | |
| download | blackbird-op-linux-0054e28dc9d2d7c43b569ed5d491bc8bc2f903a9.tar.gz blackbird-op-linux-0054e28dc9d2d7c43b569ed5d491bc8bc2f903a9.zip | |
spi/pxa2xx: enable multiblock DMA transfers for LPSS devices
Intel LPSS SPI controllers need to have bit 0 (disable_ssp_dma_finish) set
in SSP_REG in order to properly perform DMA transfers spanning over
multiple blocks.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 90b27a3508a6..c6d5b97c7240 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -68,6 +68,7 @@ MODULE_ALIAS("platform:pxa2xx-spi"); #define LPSS_TX_HITHRESH_DFLT 224 /* Offset from drv_data->lpss_base */ +#define SSP_REG 0x0c #define SPI_CS_CONTROL 0x18 #define SPI_CS_CONTROL_SW_MODE BIT(0) #define SPI_CS_CONTROL_CS_HIGH BIT(1) @@ -138,6 +139,10 @@ detection_done: /* Enable software chip select control */ value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH; __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); + + /* Enable multiblock DMA transfers */ + if (drv_data->master_info->enable_dma) + __lpss_ssp_write_priv(drv_data, SSP_REG, 1); } static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable) |
