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Commit e5380078 authored by Quentin Schulz's avatar Quentin Schulz Committed by Mark Brown
Browse files

spi: atmel: add deepest PM support to SAMA5D2 



This adds deepest (Backup+Self-Refresh) PM support to the ATMEL SAMA5D2
SoC's SPI controller.

When resuming from deepest state, it is required to restore MR register
as the registers are lost since VDD core has been shut down when
entering deepest state on the SAMA5D2.

Signed-off-by: default avatarQuentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 05514c86

drivers/spi/spi-atmel.c

+9 −0
Original line number Diff line number Diff line
@@ -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)