This adds PM support to the ATMEL SAMA5D2 Xplained. When suspending, VDDCore is shut down and the SPI registers are lost. Thus, the SPI controller needs to be re-initialized after resuming from a system suspend.
Signed-off-by: Quentin Schulz <[email protected]> --- drivers/spi/spi-atmel.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 247d920..1eb83c9 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev) static int atmel_spi_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); + struct atmel_spi *as = spi_master_get_devdata(master); int ret; + ret = clk_prepare_enable(as->clk); + if (ret) + return ret; + + atmel_spi_init(as); + + clk_disable_unprepare(as->clk); + if (!pm_runtime_suspended(dev)) { ret = atmel_spi_runtime_resume(dev); if (ret) -- 2.9.3
