From 1de7061253a2742c743f3883f0e73480c9bceee0 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Wed, 3 Jul 2013 13:25:06 +0300 Subject: [PATCH] spi/pxa2xx: enable DMA on newer Intel LPSS silicon There is an additional bit in the Intel LPSS SPI private registers that needs to be set in order to be able to use DMA with the SPI controller. Enable this as well. Signed-off-by: Mika Westerberg Signed-off-by: Mark Brown --- drivers/spi/spi-pxa2xx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index f440dcee852b..e0fd6f63c93e 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -69,6 +69,8 @@ MODULE_ALIAS("platform:pxa2xx-spi"); #define LPSS_TX_HITHRESH_DFLT 224 /* Offset from drv_data->lpss_base */ +#define GENERAL_REG 0x08 +#define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24) #define SSP_REG 0x0c #define SPI_CS_CONTROL 0x18 #define SPI_CS_CONTROL_SW_MODE BIT(0) @@ -142,8 +144,13 @@ detection_done: __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); /* Enable multiblock DMA transfers */ - if (drv_data->master_info->enable_dma) + if (drv_data->master_info->enable_dma) { __lpss_ssp_write_priv(drv_data, SSP_REG, 1); + + value = __lpss_ssp_read_priv(drv_data, GENERAL_REG); + value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE; + __lpss_ssp_write_priv(drv_data, GENERAL_REG, value); + } } static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable)