linux-kernel - [PATCH 2/4] rts5208: Fix usleep_range is preferred over udelay

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Message-Id: <20190619154648.13840-2-lukas.s.schneider@fau.de>
Date:   Wed, 19 Jun 2019 17:46:46 +0200
From:   Lukas Schneider <lukas.s.schneider@....de>
To:     kim.jamie.bradley@...il.com, pakki001@....edu,
        colin.king@...onical.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Cc:     Lukas Schneider <lukas.s.schneider@....de>,
        Jannik Moritz <jannik.moritz@....de>
Subject: [PATCH 2/4] rts5208: Fix usleep_range is preferred over udelay

This patch fixes the issue reported by checkpatch:

CHECK: usleep_range is preferred over udelay;
see Documentation/timers/timers-howto.txt

It's save to sleep here instead of using busy waiting,
because we are not in an atomic context.

Signed-off-by: Lukas Schneider <lukas.s.schneider@....de>
Signed-off-by: Jannik Moritz <jannik.moritz@....de>
Cc <linux-kernel@...cs.fau.de>
---
 drivers/staging/rts5208/rtsx_card.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rts5208/rtsx_card.c b/drivers/staging/rts5208/rtsx_card.c
index 294f381518fa..960e845133c3 100644
--- a/drivers/staging/rts5208/rtsx_card.c
+++ b/drivers/staging/rts5208/rtsx_card.c
@@ -679,7 +679,7 @@ int switch_ssc_clock(struct rtsx_chip *chip, int clk)
 	if (retval < 0)
 		return STATUS_ERROR;
 
-	udelay(10);
+	usleep_range(10, 20);
 	retval = rtsx_write_register(chip, CLK_CTL, CLK_LOW_FREQ, 0);
 	if (retval)
 		return retval;
@@ -797,7 +797,7 @@ int switch_normal_clock(struct rtsx_chip *chip, int clk)
 		return retval;
 
 	if (sd_vpclk_phase_reset) {
-		udelay(200);
+		usleep_range(200, 210);
 		retval = rtsx_write_register(chip, SD_VPCLK0_CTL,
 					     PHASE_NOT_RESET, PHASE_NOT_RESET);
 		if (retval)
@@ -806,7 +806,7 @@ int switch_normal_clock(struct rtsx_chip *chip, int clk)
 					     PHASE_NOT_RESET, PHASE_NOT_RESET);
 		if (retval)
 			return retval;
-		udelay(200);
+		usleep_range(200, 210);
 	}
 	retval = rtsx_write_register(chip, CLK_CTL, 0xFF, 0);
 	if (retval)
-- 
2.19.1