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authorQuentin Schulz <quentin.schulz@free-electrons.com>2017-04-14 11:22:43 +0300
committerMark Brown <broonie@kernel.org>2017-04-18 20:50:05 +0300
commite53800787a251d67e532fadf72886be0661aba12 (patch)
tree6b022f6585b4736c20155a8378478710f088f91f /drivers/spi/spi-atmel.c
parent05514c86965f98f9b0e57f73700771fa267050a7 (diff)
downloadlinux-e53800787a251d67e532fadf72886be0661aba12.tar.xz
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: Quentin Schulz <quentin.schulz@free-electrons.com> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-atmel.c')
-rw-r--r--drivers/spi/spi-atmel.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 247d920a512f..1eb83c9613d5 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)