ARM: PL08x: ensure loops use cpu_relax()

Tight loops should use cpu_relax() to allow CPUs to reduce power
consumption while waiting for events.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-03 22:36:29 +00:00 committed by Dan Williams
parent 8c8cc2b104
commit 19386b3234
1 changed files with 3 additions and 3 deletions

View File

@ -191,7 +191,7 @@ static void pl08x_set_cregs(struct pl08x_driver_data *pl08x,
{
/* Wait for channel inactive */
while (pl08x_phy_channel_busy(ch))
;
cpu_relax();
dev_vdbg(&pl08x->adev->dev,
"WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
@ -255,7 +255,7 @@ static void pl08x_enable_phy_chan(struct pl08x_driver_data *pl08x,
* Do not access config register until channel shows as disabled
*/
while (readl(pl08x->base + PL080_EN_CHAN) & (1 << ch->id))
;
cpu_relax();
/*
* Do not access config register until channel shows as inactive
@ -288,7 +288,7 @@ static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch)
/* Wait for channel inactive */
while (pl08x_phy_channel_busy(ch))
;
cpu_relax();
}
static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch)