Commit 84310749 authored by Samuel Holland's avatar Samuel Holland Committed by Chen-Yu Tsai
Browse files

bus: sunxi-rsb: Implement suspend/resume/shutdown callbacks 



Since system firmware is likely to use the RSB bus to communicate with a
PMIC while the system is suspended, we cannot make any assumptions about
the controller state after resuming. Thus it is important to completely
reinitialize the controller.

The RSB bus needs to be ready as soon as IRQs are enabled, to handle
wakeup event IRQs coming from the PMIC. Thus it uses NOIRQ callbacks.

Signed-off-by: default avatarSamuel Holland <samuel@sholland.org>
Acked-by: default avatarMaxime Ripard <mripard@kernel.org>
Signed-off-by: default avatarChen-Yu Tsai <wens@csie.org>
parent 22754ac9

drivers/bus/sunxi-rsb.c

+30 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/regmap.h>

#include <linux/reset.h>

#include <linux/slab.h>
@@ -675,6 +676,22 @@ static void sunxi_rsb_hw_exit(struct sunxi_rsb *rsb) 
	clk_disable_unprepare(rsb->clk);

}



static int __maybe_unused sunxi_rsb_suspend(struct device *dev)

{

	struct sunxi_rsb *rsb = dev_get_drvdata(dev);



	sunxi_rsb_hw_exit(rsb);



	return 0;

}



static int __maybe_unused sunxi_rsb_resume(struct device *dev)

{

	struct sunxi_rsb *rsb = dev_get_drvdata(dev);



	return sunxi_rsb_hw_init(rsb);

}



static int sunxi_rsb_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;
@@ -756,6 +773,17 @@ static int sunxi_rsb_remove(struct platform_device *pdev) 
	return 0;

}



static void sunxi_rsb_shutdown(struct platform_device *pdev)

{

	struct sunxi_rsb *rsb = platform_get_drvdata(pdev);



	sunxi_rsb_hw_exit(rsb);

}



static const struct dev_pm_ops sunxi_rsb_dev_pm_ops = {

	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sunxi_rsb_suspend, sunxi_rsb_resume)

};



static const struct of_device_id sunxi_rsb_of_match_table[] = {

	{ .compatible = "allwinner,sun8i-a23-rsb" },

	{}
@@ -765,9 +793,11 @@ MODULE_DEVICE_TABLE(of, sunxi_rsb_of_match_table); 
static struct platform_driver sunxi_rsb_driver = {

	.probe = sunxi_rsb_probe,

	.remove	= sunxi_rsb_remove,

	.shutdown = sunxi_rsb_shutdown,

	.driver	= {

		.name = RSB_CTRL_NAME,

		.of_match_table = sunxi_rsb_of_match_table,

		.pm = &sunxi_rsb_dev_pm_ops,

	},

};