blob: 44be771dbea8596f7cba974dbc240f8ada1ffc97 [file] [log] [blame]
From 9ffb5117fb20fae0757a48026a7890038e9f6a29 Mon Sep 17 00:00:00 2001
From: Jia-Ju Bai <baijiaju1990@gmail.com>
Date: Wed, 11 Apr 2018 16:33:42 +0800
Subject: [PATCH 1162/1795] gpu: drm: bridge: adv7511: Replace mdelay with
usleep_range in adv7511_probe
adv7511_probe() is never called in atomic context.
This function is only set as ".probe" in struct i2c_driver.
Despite never getting called from atomic context, adv7511_probe()
calls mdelay() to busily wait.
This is not necessary and can be replaced with usleep_range() to
avoid busy waiting.
This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1523435622-4329-1-git-send-email-baijiaju1990@gmail.com
(cherry picked from commit 5f27314141757794378abb2907fb7116947d644b)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 94e3ea413c33..dd3ff2f2cdce 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -1139,7 +1139,7 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
}
if (adv7511->gpio_pd) {
- mdelay(5);
+ usleep_range(5000, 6000);
gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
}
--
2.19.0