linux-kernel - [PATCH 1/3] drm/ssd130x: Fix reset timing for ssd132x

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Message-ID: <20250113152752.3369731-2-jkeeping@inmusicbrands.com>
Date: Mon, 13 Jan 2025 15:27:49 +0000
From: John Keeping <jkeeping@...usicbrands.com>
To: Javier Martinez Canillas <javierm@...hat.com>
Cc: John Keeping <jkeeping@...usicbrands.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] drm/ssd130x: Fix reset timing for ssd132x

The ssd132x family of chips require the result pulse to be at least
100us in length.  Increase the reset time to meet this requirement.

Signed-off-by: John Keeping <jkeeping@...usicbrands.com>
---
 drivers/gpu/drm/solomon/ssd130x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index b777690fd6607..2622172228361 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -363,7 +363,7 @@ static void ssd130x_reset(struct ssd130x_device *ssd130x)
 
 	/* Reset the screen */
 	gpiod_set_value_cansleep(ssd130x->reset, 1);
-	udelay(4);
+	usleep_range(100, 1000);
 	gpiod_set_value_cansleep(ssd130x->reset, 0);
 	udelay(4);
 }
-- 
2.47.1