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platform/chrome: cros_ec: Shutdown on EC Panic 

When an EC panic is reported, attempt an orderly shutdown.
Force a shutdown after a brief timeout if the orderly shutdown
fails for any reason.

Using the common hw_protection_shutdown utility function since
an EC panic has the potential to cause hw damage.

This is all best effort. EC should also force a hard reset after a
short timeout.

Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20230104011524.369764-3-robbarnes@google.com
This commit is contained in:
Rob Barnes 2023-01-04 01:15:24 +00:00 committed by Tzung-Bi Shih
parent d90fa2c64d
commit 957445d730
1 changed files with 3 additions and 0 deletions
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3
drivers/platform/chrome/cros_ec_lpc.c
View File

@ -21,6 +21,7 @@
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/reboot.h>
#include <linux/suspend.h>
#include "cros_ec.h"
@ -323,6 +324,8 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
if (value == ACPI_NOTIFY_CROS_EC_PANIC) {
dev_emerg(ec_dev->dev, "CrOS EC Panic Reported. Shutdown is imminent!");
blocking_notifier_call_chain(&ec_dev->panic_notifier, 0, ec_dev);
/* Begin orderly shutdown. Force shutdown after 1 second. */
hw_protection_shutdown("CrOS EC Panic", 1000);
/* Do not query for other events after a panic is reported */
return;
}