From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Date: Thu, 16 Feb 2017 17:27:59 +0000 (+0100)
Subject: i2c: at91: ensure state is restored after suspending
X-Git-Tag: Ubuntu-5.13.0-19.19~13972^2~3
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=e3ccc921b7d8fd1fcd10a00720e09823d8078666;p=mirror_ubuntu-jammy-kernel.git

i2c: at91: ensure state is restored after suspending

When going to suspend, the I2C registers may be lost because the power to
VDDcore is cut. Restore them when resuming.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index e4fcb0c2bc97..fabbb9e49161 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -1180,6 +1180,7 @@ static int at91_twi_suspend_noirq(struct device *dev)
 
 static int at91_twi_resume_noirq(struct device *dev)
 {
+	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
 	int ret;
 
 	if (!pm_runtime_status_suspended(dev)) {
@@ -1191,6 +1192,8 @@ static int at91_twi_resume_noirq(struct device *dev)
 	pm_runtime_mark_last_busy(dev);
 	pm_request_autosuspend(dev);
 
+	at91_init_twi_bus(twi_dev);
+
 	return 0;
 }