71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
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From 3e1c4ac8f93cc6350d1344e669a2a5bf9caac9e7 Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Mon, 30 Dec 2019 22:50:02 -0600
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Subject: [PATCH 155/351] bus: sunxi-rsb: Implement global suspend/resume
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callbacks
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Since system firmware is likely to use the RSB bus to communicate with a
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PMIC while the system is suspended, we cannot make any assumptions about
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the controller state after resuming. Thus it is important to completely
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reinitialize the controller.
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The RSB bus needs to be ready as soon as IRQs are enabled, to handle
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wakeup event IRQs coming from the PMIC. Thus it uses NOIRQ callbacks.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/bus/sunxi-rsb.c | 22 +++++++++++++++++++++-
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1 file changed, 21 insertions(+), 1 deletion(-)
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diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
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index 1795ad7f0bfe..19b8ee47a47a 100644
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--- a/drivers/bus/sunxi-rsb.c
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+++ b/drivers/bus/sunxi-rsb.c
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@@ -45,6 +45,7 @@
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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+#include <linux/pm.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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#include <linux/slab.h>
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@@ -648,6 +649,24 @@ static int sunxi_rsb_exit_controller(struct sunxi_rsb *rsb)
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return 0;
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}
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+static int __maybe_unused sunxi_rsb_suspend(struct device *dev)
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+{
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+ struct sunxi_rsb *rsb = dev_get_drvdata(dev);
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+
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+ return sunxi_rsb_exit_controller(rsb);
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+}
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+
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+static int __maybe_unused sunxi_rsb_resume(struct device *dev)
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+{
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+ struct sunxi_rsb *rsb = dev_get_drvdata(dev);
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+
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+ return sunxi_rsb_init_controller(rsb);
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+}
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+
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+static const struct dev_pm_ops sunxi_rsb_dev_pm_ops = {
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+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sunxi_rsb_suspend, sunxi_rsb_resume)
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+};
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+
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static int sunxi_rsb_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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@@ -738,8 +757,9 @@ static struct platform_driver sunxi_rsb_driver = {
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.probe = sunxi_rsb_probe,
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.remove = sunxi_rsb_remove,
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.driver = {
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- .name = RSB_CTRL_NAME,
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+ .name = RSB_CTRL_NAME,
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.of_match_table = sunxi_rsb_of_match_table,
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+ .pm = &sunxi_rsb_dev_pm_ops,
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},
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};
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--
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2.34.0
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