[PATCH] [media] ov9650: use msleep() for uncritical long delay

From: Nicholas Mc Guire
Date: Mon Jan 16 2017 - 08:57:47 EST


ulseep_range() uses hrtimers and provides no advantage over msleep()
for larger delays. Fix up the 25ms delays here to use msleep() and
reduce the load on the hrtimer subsystem.

Link: http://lkml.org/lkml/2017/1/11/377
Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
---
Problem found by coccinelle script

Patch was compile tested with: x86_64_defconfig + CONFIG_MEDIA_SUPPORT=m
CONFIG_MEDIA_ANALOG_TV_SUPPORT=y, CONFIG_MEDIA_CONTROLLER=y
CONFIG_VIDEO_V4L2_SUBDEV_API=y, CONFIG_MEDIA_SUBDRV_AUTOSELECT=n
CONFIG_VIDEO_OV9650=m

Patch is aginast 4.10-rc3 (localversion-next is next-20170116)

drivers/media/i2c/ov9650.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov9650.c b/drivers/media/i2c/ov9650.c
index 502c722..2de2fbb 100644
--- a/drivers/media/i2c/ov9650.c
+++ b/drivers/media/i2c/ov9650.c
@@ -522,7 +522,7 @@ static void __ov965x_set_power(struct ov965x *ov965x, int on)
if (on) {
ov965x_gpio_set(ov965x->gpios[GPIO_PWDN], 0);
ov965x_gpio_set(ov965x->gpios[GPIO_RST], 0);
- usleep_range(25000, 26000);
+ msleep(25);
} else {
ov965x_gpio_set(ov965x->gpios[GPIO_RST], 1);
ov965x_gpio_set(ov965x->gpios[GPIO_PWDN], 1);
@@ -1438,7 +1438,7 @@ static int ov965x_detect_sensor(struct v4l2_subdev *sd)

mutex_lock(&ov965x->lock);
__ov965x_set_power(ov965x, 1);
- usleep_range(25000, 26000);
+ msleep(25);

/* Check sensor revision */
ret = ov965x_read(client, REG_PID, &pid);
--
2.1.4