diff options
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index ce66cf44bba5..7d6d3b74d25b 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -1445,6 +1445,28 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev) } #endif +static int pxa2xx_spi_fw_translate_cs(struct spi_master *master, unsigned cs) +{ + struct driver_data *drv_data = spi_master_get_devdata(master); + + if (has_acpi_companion(&drv_data->pdev->dev)) { + switch (drv_data->ssp_type) { + /* + * For Atoms the ACPI DeviceSelection used by the Windows + * driver starts from 1 instead of 0 so translate it here + * to match what Linux expects. + */ + case LPSS_BYT_SSP: + return cs - 1; + + default: + break; + } + } + + return cs; +} + static int pxa2xx_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1497,6 +1519,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) master->setup = setup; master->transfer_one_message = pxa2xx_spi_transfer_one_message; master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; + master->fw_translate_cs = pxa2xx_spi_fw_translate_cs; master->auto_runtime_pm = true; drv_data->ssp_type = ssp->type; |