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Commit 00cba11f authored by Thierry Reding's avatar Thierry Reding
Browse files

firmware: tegra: bpmp: Implement suspend/resume support 



When returning from a system sleep state, the BPMP driver needs to
reinitialize the IVC channels used to communicate with the BPMP to
restore proper functionality.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 5b394b2d

drivers/firmware/tegra/bpmp.c

+19 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/of_address.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/semaphore.h>

#include <linux/sched/clock.h>
@@ -843,6 +844,23 @@ static int tegra_bpmp_probe(struct platform_device *pdev) 
	return err;

}



static int __maybe_unused tegra_bpmp_resume(struct device *dev)

{

	struct tegra_bpmp *bpmp = dev_get_drvdata(dev);

	unsigned int i;



	/* reset message channels */

	tegra_bpmp_channel_reset(bpmp->tx_channel);

	tegra_bpmp_channel_reset(bpmp->rx_channel);



	for (i = 0; i < bpmp->threaded.count; i++)

		tegra_bpmp_channel_reset(&bpmp->threaded_channels[i]);



	return 0;

}



static SIMPLE_DEV_PM_OPS(tegra_bpmp_pm_ops, NULL, tegra_bpmp_resume);



static const struct tegra_bpmp_soc tegra186_soc = {

	.channels = {

		.cpu_tx = {
@@ -871,6 +889,7 @@ static struct platform_driver tegra_bpmp_driver = { 
	.driver = {

		.name = "tegra-bpmp",

		.of_match_table = tegra_bpmp_match,

		.pm = &tegra_bpmp_pm_ops,

	},

	.probe = tegra_bpmp_probe,

};