The mmc_delay() is a wrapper function for cond_resched() and udelay().
o mdelay()
block the system when busy-waiting.
o cond_resched()
suspend the currently running task to enable CPU
to process other tasks, so it is non-blocking
regarding the whole system.
Change mdelay() to mmc_delay() to avoid chewing CPU when busy wait.
Signed-off-by: Chunhe Lan <[email protected]>
Signed-off-by: Kumar Gala <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Chris Ball <[email protected]>
---
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 d25f9ab..5e33732 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 <[email protected]>
@@ -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 6f0bfc0..a20c4f0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -206,7 +206,7 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask)
return;
}
timeout--;
- mdelay(1);
+ mmc_delay(1);
}
if (host->ops->platform_reset_exit)
@@ -998,7 +998,7 @@ 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);
@@ -1179,7 +1179,7 @@ static void sdhci_set_clock(struct sdhci_host *host,
unsigned int clock)
return;
}
timeout--;
- mdelay(1);
+ mmc_delay(1);
}
clk |= SDHCI_CLOCK_CARD_EN;
@@ -1244,7 +1244,7 @@ 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;
}
@@ -1895,7 +1895,7 @@ 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
--
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