renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-16 17:23:55 +08:00
Code

spi: imx: set MX51_ECSPI_CTRL_SMC bit in setup function

Browse Source 
Now that the config function knows whether we are doing DMA or not we
can do the necessary register setup in the config function and no longer
have to do this in the trigger function. With this the trigger function
becomes a no-op for DMA, so instead of testing if we are doing DMA or
not in the trigger function we simply no longer call it in the DMA case.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sascha Hauer 2016-02-24 09:20:32 +01:00 committed by Mark Brown
parent d629c2a005
commit b03c3884ca
1 changed files with 6 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/spi/spi-imx.c
View File

@ -106,7 +106,6 @@ struct spi_imx_data {
unsigned int txfifo; /* number of words pushed in tx FIFO */ unsigned int txfifo; /* number of words pushed in tx FIFO */
/* DMA */ /* DMA */
unsigned int dma_finished;
bool usedma; bool usedma;
u32 wml; u32 wml;
struct completion dma_rx_completion; struct completion dma_rx_completion;
@ -324,14 +323,10 @@ static void __maybe_unused mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int
static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
{ {
u32 reg = readl(spi_imx->base + MX51_ECSPI_CTRL); u32 reg;
if (!spi_imx->usedma) reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
reg |= MX51_ECSPI_CTRL_XCH; reg |= MX51_ECSPI_CTRL_XCH;
else if (!spi_imx->dma_finished)
reg |= MX51_ECSPI_CTRL_SMC;
else
reg &= ~MX51_ECSPI_CTRL_SMC;
writel(reg, spi_imx->base + MX51_ECSPI_CTRL); writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
} }
@ -371,6 +366,9 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
if (config->mode & SPI_CS_HIGH) if (config->mode & SPI_CS_HIGH)
cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs);
if (spi_imx->usedma)
ctrl |= MX51_ECSPI_CTRL_SMC;
/* CTRL register always go first to bring out controller from reset */ /* CTRL register always go first to bring out controller from reset */
writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
@ -1012,9 +1010,6 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
reinit_completion(&spi_imx->dma_rx_completion); reinit_completion(&spi_imx->dma_rx_completion);
reinit_completion(&spi_imx->dma_tx_completion); reinit_completion(&spi_imx->dma_tx_completion);
/* Trigger the cspi module. */
spi_imx->dma_finished = 0;
/* /*
* Set these order to avoid potential RX overflow. The overflow may * Set these order to avoid potential RX overflow. The overflow may
* happen if we enable SPI HW before starting RX DMA due to rescheduling * happen if we enable SPI HW before starting RX DMA due to rescheduling
@ -1025,7 +1020,6 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
*/ */
dma_async_issue_pending(master->dma_rx); dma_async_issue_pending(master->dma_rx);
dma_async_issue_pending(master->dma_tx); dma_async_issue_pending(master->dma_tx);
spi_imx->devtype_data->trigger(spi_imx);
transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
@ -1046,9 +1040,6 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
} }
} }
spi_imx->dma_finished = 1;
spi_imx->devtype_data->trigger(spi_imx);
if (!timeout) if (!timeout)
ret = -ETIMEDOUT; ret = -ETIMEDOUT;
else else