openwrt/target/linux/gemini/patches-4.14/0026-power-gemini-poweroff-Avoid-spurious-poweroff.patch

From da443bc125265cae24a0e5f7d1c7bba196a9319f Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Thu, 22 Feb 2018 08:34:35 +0100
Subject: [PATCH 26/31] power: gemini-poweroff: Avoid spurious poweroff

On the D-Link DIR-685 we get spurious poweroff from
infrared. Since that block (CIR) doesn't even have a
driver this can be safely ignored, we can revisit this
code once we have a device supporting CIR.

On the D-Link DNS-313 we get spurious poweroff from
the power button. This appears to be an initialization
issue: we need to enable the block (start the state
machine) before we clear any dangling IRQ.

This patch fixes both issues.

Fixes: f7a388d6cd1c ("power: reset: Add a driver for the Gemini poweroff")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Fix both issues and rename the patch.
- Proper commit message with specifics.
---
 drivers/power/reset/gemini-poweroff.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

--- a/drivers/power/reset/gemini-poweroff.c
+++ b/drivers/power/reset/gemini-poweroff.c
@@ -47,8 +47,12 @@ static irqreturn_t gemini_powerbutton_in
 	val &= 0x70U;
 	switch (val) {
 	case GEMINI_STAT_CIR:
-		dev_info(gpw->dev, "infrared poweroff\n");
-		orderly_poweroff(true);
+		/*
+		 * We do not yet have a driver for the infrared
+		 * controller so it can cause spurious poweroff
+		 * events. Ignore those for now.
+		 */
+		dev_info(gpw->dev, "infrared poweroff - ignored\n");
 		break;
 	case GEMINI_STAT_RTC:
 		dev_info(gpw->dev, "RTC poweroff\n");
@@ -116,7 +120,17 @@ static int gemini_poweroff_probe(struct
 		return -ENODEV;
 	}
 
-	/* Clear the power management IRQ */
+	/*
+	 * Enable the power controller. This is crucial on Gemini
+	 * systems: if this is not done, pressing the power button
+	 * will result in unconditional poweroff without any warning.
+	 * This makes the kernel handle the poweroff.
+	 */
+	val = readl(gpw->base + GEMINI_PWC_CTRLREG);
+	val |= GEMINI_CTRL_ENABLE;
+	writel(val, gpw->base + GEMINI_PWC_CTRLREG);
+
+	/* Now that the state machine is active, clear the IRQ */
 	val = readl(gpw->base + GEMINI_PWC_CTRLREG);
 	val |= GEMINI_CTRL_IRQ_CLR;
 	writel(val, gpw->base + GEMINI_PWC_CTRLREG);
@@ -129,16 +143,6 @@ static int gemini_poweroff_probe(struct
 	pm_power_off = gemini_poweroff;
 	gpw_poweroff = gpw;
 
-	/*
-	 * Enable the power controller. This is crucial on Gemini
-	 * systems: if this is not done, pressing the power button
-	 * will result in unconditional poweroff without any warning.
-	 * This makes the kernel handle the poweroff.
-	 */
-	val = readl(gpw->base + GEMINI_PWC_CTRLREG);
-	val |= GEMINI_CTRL_ENABLE;
-	writel(val, gpw->base + GEMINI_PWC_CTRLREG);
-
 	dev_info(dev, "Gemini poweroff driver registered\n");
 
 	return 0;