linux-kernel - [PATCH 1/2] video: ssd1307fb: Use gpiod_set_value

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Message-Id: <1537348724-22976-1-git-send-email-michal.vokac@ysoft.com>
Date:   Wed, 19 Sep 2018 11:18:43 +0200
From:   Michal Vokáč <michal.vokac@...ft.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: [PATCH 1/2] video: ssd1307fb: Use gpiod_set_value_cansleep() for reset

The reset signal can be produced by GPIO expander that can sleep.
In that case the probe function fails. Allow using GPIO expanders for
the reset signal by using the non-atomic gpiod_set_value_cansleep()
function.

Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
---
 drivers/video/fbdev/ssd1307fb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index ba66c02..e7ae135 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -728,9 +728,9 @@ static int ssd1307fb_probe(struct i2c_client *client,
 
 	if (par->reset) {
 		/* Reset the screen */
-		gpiod_set_value(par->reset, 0);
+		gpiod_set_value_cansleep(par->reset, 0);
 		udelay(4);
-		gpiod_set_value(par->reset, 1);
+		gpiod_set_value_cansleep(par->reset, 1);
 		udelay(4);
 	}
 
-- 
2.1.4