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From: Simon Horman <horms+renesas@verge.net.au>
To: Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Ulf Hansson <ulf.hansson@linaro.org>
Cc: Magnus Damm <magnus.damm@gmail.com>,
	linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: [PATCH] mmc: tmio: Replace msleep() of 20ms or less with usleep_range()
Date: Fri,  3 Nov 2017 10:36:28 +0100	[thread overview]
Message-ID: <20171103093628.13108-1-horms+renesas@verge.net.au> (raw)

From: Masaharu Hayakawa <masaharu.hayakawa.ry@renesas.com>

As documented in Documentation/timers/timers-howto.txt
as follows, replace msleep() with usleep_range().

msleep(1~20) may not do what the caller intends, and
will often sleep longer (~20 ms actual sleep for any
value given in the 1~20ms range). In many cases this
is not the desired behavior.

Signed-off-by: Masaharu Hayakawa <masaharu.hayakawa.ry@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
v1 [Simon Horman]
* Extend to cover all instances of msleep(<20);

v0 [Masaharu Hayakawa]

This patch is based on a patch in BSP v3.5.6
---
 drivers/mmc/host/tmio_mmc_core.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 4c8198f8b04a..583bf3262df5 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -167,11 +167,11 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
 
 	/* HW engineers overrode docs: no sleep needed on R-Car2+ */
 	if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
-		msleep(10);
+		usleep_range(10000, 11000);
 
 	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
 		sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
-		msleep(10);
+		usleep_range(10000, 11000);
 	}
 }
 
@@ -179,7 +179,7 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
 {
 	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
 		sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
-		msleep(10);
+		usleep_range(10000, 11000);
 	}
 
 	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
@@ -187,7 +187,7 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
 
 	/* HW engineers overrode docs: no sleep needed on R-Car2+ */
 	if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
-		msleep(10);
+		usleep_range(10000, 11000);
 }
 
 static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
@@ -219,7 +219,7 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
 			sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
 	if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
-		msleep(10);
+		usleep_range(10000, 11000);
 
 	tmio_mmc_clk_start(host);
 }
@@ -230,11 +230,11 @@ static void tmio_mmc_reset(struct tmio_mmc_host *host)
 	sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
 	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
 		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
-	msleep(10);
+	usleep_range(10000, 11000);
 	sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
 	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
 		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
-	msleep(10);
+	usleep_range(10000, 11000);
 
 	if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
 		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
-- 
2.11.0

             reply	other threads:[~2017-11-03  9:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-03  9:36 Simon Horman [this message]
2017-11-03  9:55 ` [PATCH] mmc: tmio: Replace msleep() of 20ms or less with usleep_range() Wolfram Sang
2017-11-07 13:23 ` Ulf Hansson

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