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spi: pxa2xx: Introduce DMA burst size support

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Some masters may have different DMA burst size than hard coded default.
In such case respect the value given by DMA burst size provided via
platform data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2019-03-19 17:48:42 +02:00 committed by Mark Brown
parent 560ee7e910
commit 37821a82e6
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 9 additions and 1 deletions
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4
drivers/spi/spi-pxa2xx-dma.c
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@ -239,13 +239,15 @@ int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
u32 *threshold)
{
struct pxa2xx_spi_chip *chip_info = spi->controller_data;
struct driver_data *drv_data = spi_controller_get_devdata(spi->controller);
u32 dma_burst_size = drv_data->controller_info->dma_burst_size;
/*
* If the DMA burst size is given in chip_info we use that,
* otherwise we use the default. Also we use the default FIFO
* thresholds for now.
*/
*burst_code = chip_info ? chip_info->dma_burst_size : 1;
*burst_code = chip_info ? chip_info->dma_burst_size : dma_burst_size;
*threshold = SSCR1_RxTresh(RX_THRESH_DFLT)
| SSCR1_TxTresh(TX_THRESH_DFLT);

4
drivers/spi/spi-pxa2xx-pci.c
View File

@ -34,6 +34,8 @@ struct pxa_spi_info {
void *tx_param;
void *rx_param;
int dma_burst_size;
int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
};
@ -132,6 +134,7 @@ static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
rx->dma_dev = &dma_dev->dev;
c->dma_filter = lpss_dma_filter;
c->dma_burst_size = 8;
return 0;
}
@ -222,6 +225,7 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
spi_pdata.tx_param = c->tx_param;
spi_pdata.rx_param = c->rx_param;
spi_pdata.enable_dma = c->rx_param && c->tx_param;
spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1;
ssp = &spi_pdata.ssp;
ssp->phys_base = pci_resource_start(dev, 0);

1
drivers/spi/spi-pxa2xx.c
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@ -1564,6 +1564,7 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
pdata->is_slave = of_property_read_bool(pdev->dev.of_node, "spi-slave");
pdata->num_chipselect = 1;
pdata->enable_dma = true;
pdata->dma_burst_size = 1;
return pdata;
}

1
include/linux/spi/pxa2xx_spi.h
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@ -25,6 +25,7 @@ struct dma_chan;
struct pxa2xx_spi_controller {
u16 num_chipselect;
u8 enable_dma;
u8 dma_burst_size;
bool is_slave;
/* DMA engine specific config */