linux-kernel - [PATCH v3 4/6] mfd: atmel-hlcdc: return in case of error

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Message-ID: <1576672109-22707-5-git-send-email-claudiu.beznea@microchip.com>
Date:   Wed, 18 Dec 2019 14:28:27 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <boris.brezillon@...tlin.com>, <airlied@...ux.ie>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <lee.jones@...aro.org>, <sam@...nborg.org>
CC:     <peda@...ntia.se>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v3 4/6] mfd: atmel-hlcdc: return in case of error

For HLCDC timing engine configurations bit ATMEL_HLCDC_SIP of
ATMEL_HLCDC_SR needs to be polled before applying new config. In case of
timeout there is no indicator about this, so, return in case of timeout
and also print a message about this.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mfd/atmel-hlcdc.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/atmel-hlcdc.c b/drivers/mfd/atmel-hlcdc.c
index 92bfcaa62ace..a1e46c87b956 100644
--- a/drivers/mfd/atmel-hlcdc.c
+++ b/drivers/mfd/atmel-hlcdc.c
@@ -40,10 +40,17 @@ static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
 
 	if (reg <= ATMEL_HLCDC_DIS) {
 		u32 status;
-
-		readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
-					  status, !(status & ATMEL_HLCDC_SIP),
-					  1, 100);
+		int ret;
+
+		ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
+						status,
+						!(status & ATMEL_HLCDC_SIP),
+						1, 100);
+		if (ret) {
+			dev_err(hregmap->dev,
+				"Timeout! Clock domain synchronization is in progress!\n");
+			return ret;
+		}
 	}
 
 	writel(val, hregmap->regs + reg);
-- 
2.7.4