[PATCH v3 2/2] mmc: Use mmc_delay() instead of mdelay() for time delay
DORMANTno replies
From: Chunhe Lan <hidden>
Date: 2012-08-10 10:24:41
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
The mmc_delay() is a wrapper function for mdelay() and msleep().
o mdelay() -- block the system when busy-waiting.
o msleep() -- suspend the currently running task to enable CPU
to process other tasks, so it is non-blocking
regarding the whole system.
When the desired delay time is more than a period of timer interrupt,
just use msleep(). Change mdelay() to mmc_delay() to avoid chewing
CPU when busy wait.
Signed-off-by: Shengzhou Liu <redacted>
Signed-off-by: Chunhe Lan <redacted>
Signed-off-by: Kumar Gala <redacted>
Cc: Chris Ball <redacted>
---
drivers/mmc/host/sdhci-esdhc.h | 4 ++--
drivers/mmc/host/sdhci.c | 10 +++++-----
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
index b97b2f5..272cea0 100644
--- a/drivers/mmc/host/sdhci-esdhc.h
+++ b/drivers/mmc/host/sdhci-esdhc.h@@ -1,7 +1,7 @@ /* * Freescale eSDHC controller driver generics for OF and pltfm. * - * Copyright (c) 2007 Freescale Semiconductor, Inc. + * Copyright (c) 2007, 2012 Freescale Semiconductor, Inc. * Copyright (c) 2009 MontaVista Software, Inc. * Copyright (c) 2010 Pengutronix e.K. * Author: Wolfram Sang <w.sang@pengutronix.de>
@@ -73,7 +73,7 @@ static inline void esdhc_set_clock(struct sdhci_host *host, unsigned int clock) | (div << ESDHC_DIVIDER_SHIFT) | (pre_div << ESDHC_PREDIV_SHIFT)); sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL); - mdelay(1); + mmc_delay(1); out: host->clock = clock; }
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9a11dc3..6e67bc4 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -205,7 +205,7 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask) return; } timeout--; - mdelay(1); + mmc_delay(1); } if (host->ops->platform_reset_exit)
@@ -997,7 +997,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) return; } timeout--; - mdelay(1); + mmc_delay(1); } mod_timer(&host->timer, jiffies + 10 * HZ);
@@ -1178,7 +1178,7 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) return; } timeout--; - mdelay(1); + mmc_delay(1); } clk |= SDHCI_CLOCK_CARD_EN;
@@ -1243,7 +1243,7 @@ static int sdhci_set_power(struct sdhci_host *host, unsigned short power) * can apply clock after applying power */ if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER) - mdelay(10); + mmc_delay(10); return power; }
@@ -1850,7 +1850,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); tuning_loop_counter--; timeout--; - mdelay(1); + mmc_delay(1); } while (ctrl & SDHCI_CTRL_EXEC_TUNING); /*
--
1.7.6.5