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spi: rockchip: enable autosuspend feature

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If SPI is used for periodic polling any sensor, significant delays
sometimes appear. Switching on module clocks during resume lead to delays.
Enabling autosuspend mode causes the controller to not suspend between
SPI transfers and the delays disappear.

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Link: https://lore.kernel.org/r/20201016085014.31667-1-al.kochet@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexander Kochetkov 2020-10-16 11:50:14 +03:00 committed by Mark Brown
parent 345980a3a5
commit 940f3bbf3d
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1 changed files with 4 additions and 0 deletions
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4
drivers/spi/spi-rockchip.c
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@ -160,6 +160,8 @@
#define ROCKCHIP_SPI_VER2_TYPE1 0x05EC0002
#define ROCKCHIP_SPI_VER2_TYPE2 0x00110002
#define ROCKCHIP_AUTOSUSPEND_TIMEOUT 2000
struct rockchip_spi {
struct device *dev;
@ -715,6 +717,8 @@ static int rockchip_spi_probe(struct platform_device *pdev)
goto err_disable_spiclk;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, ROCKCHIP_AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);