linux-kernel - [PATCH v2 6/6] Input: snvs_pwrkey - only IRQ

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Date:   Tue, 25 Feb 2020 16:12:01 +0000
From:   André Draszik <git@...red.net>
To:     linux-kernel@...r.kernel.org
Cc:     André Draszik <git@...red.net>,
        Horia Geantă <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Anson Huang <Anson.Huang@....com>,
        Robin Gong <yibin.gong@....com>, linux-crypto@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-input@...r.kernel.org
Subject: [PATCH v2 6/6] Input: snvs_pwrkey - only IRQ_HANDLED for our own events

The snvs_pwrkey shares the SNVS LPSR status register with the snvs_rtc.

This driver here should only return IRQ_HANDLED if the status register
indicates that the event we're handling in the irq handler was genuinely
intended for this driver. Otheriwse the interrupt subsystem will
assume the interrupt was handled successfully even though it wasn't
at all.

Signed-off-by: André Draszik <git@...red.net>
Cc: "Horia Geantă" <horia.geanta@....com>
Cc: Aymen Sghaier <aymen.sghaier@....com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
Cc: Fabio Estevam <festevam@...il.com>
Cc: NXP Linux Team <linux-imx@....com>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Anson Huang <Anson.Huang@....com>
Cc: Robin Gong <yibin.gong@....com>
Cc: linux-crypto@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-input@...r.kernel.org

---
v2:
* no changes
---
 drivers/input/keyboard/snvs_pwrkey.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
index 382d2ae82c9b..980867886b34 100644
--- a/drivers/input/keyboard/snvs_pwrkey.c
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -82,7 +82,9 @@ static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
 	clk_enable(pdata->clk);

 	regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
-	if (lp_status & SNVS_LPSR_SPO) {
+	lp_status &= SNVS_LPSR_SPO;
+
+	if (lp_status) {
 		if (pdata->minor_rev == 0) {
 			/*
 			 * The first generation i.MX[6|7] SoCs only send an
@@ -98,14 +100,14 @@ static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
 			mod_timer(&pdata->check_timer,
 			          jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
 		}
-	}

-	/* clear SPO status */
-	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+		/* clear SPO status */
+		regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
+	}

 	clk_disable(pdata->clk);

-	return IRQ_HANDLED;
+	return lp_status ? IRQ_HANDLED : IRQ_NONE;
 }

 static void imx_snvs_pwrkey_act(void *pdata)
-- 
2.23.0.rc1