linux-kernel - [PATCH 2/3] backlight: ltv350qv: Use usleep_range() instead of msleep() for small sleeps

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Date:	Mon, 06 Aug 2012 13:44:44 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'LKML' <linux-kernel@...r.kernel.org>
Cc:	'Richard Purdie' <rpurdie@...ys.net>,
	'Haavard Skinnemoen' <hskinnemoen@...il.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH 2/3] backlight: ltv350qv: Use usleep_range() instead of
 msleep() for small sleeps

Since msleep might not sleep for the desired amount when less
than 20ms, use usleep_range.

Cc: Haavard Skinnemoen <hskinnemoen@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>
Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/video/backlight/ltv350qv.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/backlight/ltv350qv.c b/drivers/video/backlight/ltv350qv.c
index 6c0f1ac..4066a5b 100644
--- a/drivers/video/backlight/ltv350qv.c
+++ b/drivers/video/backlight/ltv350qv.c
@@ -75,7 +75,7 @@ static int ltv350qv_power_on(struct ltv350qv *lcd)
 	/* Power On Reset Display off State */
 	if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000))
 		goto err;
-	msleep(15);
+	usleep_range(15000, 16000);
 
 	/* Power Setting Function 1 */
 	if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE))
@@ -153,7 +153,7 @@ err_settings:
 err_power2:
 err_power1:
 	ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
-	msleep(1);
+	usleep_range(1000, 1100);
 err:
 	ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
 	return -EIO;
@@ -175,7 +175,7 @@ static int ltv350qv_power_off(struct ltv350qv *lcd)
 	ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
 
 	/* Wait at least 1 ms */
-	msleep(1);
+	usleep_range(1000, 1100);
 
 	/* Power down setting 2 */
 	ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
-- 
1.7.1


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