Re: [alsa-devel] [PATCH 2/3] spi: Add the use of DMA config operation

Boojin Kim wrote:

Config operation is separated from request operation in DMA common operation. Because spi driver can change the DMA config for every transfer. So this patch is using the separated DMA config operation.

Signed-off-by: Boojin Kim boojin.kim@samsung.com Signed-off-by: Kyoungil Kim ki0351.kim@samsung.com

---

drivers/spi/spi-s3c64xx.c | 33 +++++++++++++++++++-------------- 1 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 15f864d..f4e2341 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -262,14 +262,24 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, unsigned len, dma_addr_t buf) { struct s3c64xx_spi_driver_data *sdd;

• struct samsung_dma_prep_info info;

• struct samsung_dma_prep info;
• struct samsung_dma_config config;

• if (dma->direction == DMA_DEV_TO_MEM)

• if (dma->direction == DMA_DEV_TO_MEM) { sdd = container_of((void *)dma, struct s3c64xx_spi_driver_data, rx_dma);

• else

• config.direction = sdd->rx_dma.direction;
  

• config.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
  

• config.width = sdd->cur_bpw / 8;
  

• sdd->ops->config(sdd->rx_dma.ch, &config);
  

• } else { sdd = container_of((void *)dma, struct s3c64xx_spi_driver_data, tx_dma);

• config.direction =  sdd->tx_dma.direction;
  

• config.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
  

• config.width = sdd->cur_bpw / 8;
  

• sdd->ops->config(sdd->tx_dma.ch, &config);
  

• }

  info.cap = DMA_SLAVE; info.len = len;

@@ -284,20 +294,15 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,

static int acquire_dma(struct s3c64xx_spi_driver_data *sdd) {

• struct samsung_dma_info info;

• struct samsung_dma_req req;

  sdd->ops = samsung_dma_get_ops();

• info.cap = DMA_SLAVE;
• info.client = &s3c64xx_spi_dma_client;
• info.width = sdd->cur_bpw / 8;
• info.direction = sdd->rx_dma.direction;
• info.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA;
• sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &info);
• info.direction = sdd->tx_dma.direction;
• info.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA;
• sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &info);

• req.cap = DMA_SLAVE;

• req.client = &s3c64xx_spi_dma_client;

• sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &req);

• sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &req);

  return 1;

}

1.7.1

Hi Grant,

I think, this is needed to support Samsung SPI with DMA and this has dependency with other patches in this series.

If you're ok on this, please reply with your ack :) so that I can take this series together.

Thanks.

Best regards, Kgene. -- Kukjin Kim kgene.kim@samsung.com, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd.