From: Brian Niebuhr <[email protected]> Enable SPI only when active transfers are in progress. Keep it in local low power when not in use.
Signed-off-by: Brian Niebuhr <[email protected]> Tested-By: Michael Williamson <[email protected]> Signed-off-by: Sekhar Nori <[email protected]> --- drivers/spi/davinci_spi.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index 2e74fcd..1652bba 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -49,7 +49,6 @@ #define SPIFMT_WDELAY_SHIFT 24 #define SPIFMT_PRESCALE_SHIFT 8 - /* SPIPC0 */ #define SPIPC0_DIFUN_MASK BIT(11) /* MISO */ #define SPIPC0_DOFUN_MASK BIT(10) /* MOSI */ @@ -67,6 +66,7 @@ /* SPIGCR1 */ #define SPIGCR1_CLKMOD_MASK BIT(1) #define SPIGCR1_MASTER_MASK BIT(0) +#define SPIGCR1_POWERDOWN_MASK BIT(8) #define SPIGCR1_LOOPBACK_MASK BIT(16) #define SPIGCR1_SPIENA_MASK BIT(24) @@ -556,7 +556,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) data1_reg_val = ioread32(davinci_spi->base + SPIDAT1); - /* Enable SPI */ + clear_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_SPIENA_MASK); INIT_COMPLETION(davinci_spi->done); @@ -693,6 +693,9 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t) clear_io_bits(davinci_spi->base + SPIINT, SPIINT_DMA_REQ_EN); } + clear_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_SPIENA_MASK); + set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); + /* * Check for bit error, desync error,parity error,timeout error and * receive overflow errors @@ -937,6 +940,7 @@ static int davinci_spi_probe(struct platform_device *pdev) /* master mode default */ set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_CLKMOD_MASK); set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_MASTER_MASK); + set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_POWERDOWN_MASK); ret = spi_bitbang_start(&davinci_spi->bitbang); if (ret) -- 1.7.3.2 ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
