mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
spi/s3c64xx: Factor transfer start out of enable/disable_cs()
The hardware level /CS handling is tied to the start of the data path so is rolled into the same function as we use to manipulate GPIO /CS. In order to support factoring out the /CS handling into the core separate the two and explicitly start transfers separately to the /CS handling. Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
parent
dd97e26849
commit
8c09daa1c9
1 changed files with 11 additions and 8 deletions
|
@ -570,9 +570,6 @@ static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
|
|||
|
||||
if (spi->cs_gpio >= 0)
|
||||
gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 1 : 0);
|
||||
|
||||
/* Start the signals */
|
||||
writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
}
|
||||
|
||||
static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
|
||||
|
@ -702,9 +699,6 @@ static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
|
|||
|
||||
if (spi->cs_gpio >= 0)
|
||||
gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
|
||||
|
||||
/* Quiese the signals */
|
||||
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
}
|
||||
|
||||
static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
|
||||
|
@ -930,6 +924,9 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
|
|||
/* Slave Select */
|
||||
enable_cs(sdd, spi);
|
||||
|
||||
/* Start the signals */
|
||||
writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
|
||||
spin_unlock_irqrestore(&sdd->lock, flags);
|
||||
|
||||
status = wait_for_xfer(sdd, xfer, use_dma);
|
||||
|
@ -970,10 +967,14 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
|
|||
}
|
||||
|
||||
out:
|
||||
if (!cs_toggle || status)
|
||||
if (!cs_toggle || status) {
|
||||
/* Quiese the signals */
|
||||
writel(S3C64XX_SPI_SLAVE_SIG_INACT,
|
||||
sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
disable_cs(sdd, spi);
|
||||
else
|
||||
} else {
|
||||
sdd->tgl_spi = spi;
|
||||
}
|
||||
|
||||
s3c64xx_spi_unmap_mssg(sdd, msg);
|
||||
|
||||
|
@ -1112,11 +1113,13 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
|
|||
}
|
||||
|
||||
pm_runtime_put(&sdd->pdev->dev);
|
||||
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
disable_cs(sdd, spi);
|
||||
return 0;
|
||||
|
||||
setup_exit:
|
||||
/* setup() returns with device de-selected */
|
||||
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
|
||||
disable_cs(sdd, spi);
|
||||
|
||||
gpio_free(cs->line);
|
||||
|
|
Loading…
Reference in a new issue