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[PATCH] bcm43xx: voluntary preemtion in the calibration loops

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This patch adds voluntary preemption points into the
PHY calibration loops to allow non-CONFIG_PREEMPT machines
to not suffer from huge delays.
CONFIG_PREEMPT machines are already fine, because all this
code is run in non-atomic process context.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2006-06-28 20:17:57 +02:00 committed by John W. Linville
parent efa6a37021
commit 2087da5dc1
1 changed files with 18 additions and 15 deletions
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33
drivers/net/wireless/bcm43xx/bcm43xx_phy.c
View file

@ -81,6 +81,16 @@ static const s8 bcm43xx_tssi2dbm_g_table[] = {
static void bcm43xx_phy_initg(struct bcm43xx_private *bcm);
static inline
void bcm43xx_voluntary_preempt(void)
{
assert(!in_atomic() && !in_irq() &&
!in_interrupt() && !irqs_disabled());
#ifndef CONFIG_PREEMPT
cond_resched();
#endif /* CONFIG_PREEMPT */
}
void bcm43xx_raw_phy_lock(struct bcm43xx_private *bcm)
{
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
@ -133,22 +143,14 @@ void bcm43xx_phy_write(struct bcm43xx_private *bcm, u16 offset, u16 val)
void bcm43xx_phy_calibrate(struct bcm43xx_private *bcm)
{
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
unsigned long flags;
bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD); /* Dummy read. */
if (phy->calibrated)
return;
if (phy->type == BCM43xx_PHYTYPE_G && phy->rev == 1) {
/* We do not want to be preempted while calibrating
* the hardware.
*/
local_irq_save(flags);
bcm43xx_wireless_core_reset(bcm, 0);
bcm43xx_phy_initg(bcm);
bcm43xx_wireless_core_reset(bcm, 1);
local_irq_restore(flags);
}
phy->calibrated = 1;
}
@ -1299,7 +1301,9 @@ static u16 bcm43xx_phy_lo_b_r15_loop(struct bcm43xx_private *bcm)
{
int i;
u16 ret = 0;
unsigned long flags;
local_irq_save(flags);
for (i = 0; i < 10; i++){
bcm43xx_phy_write(bcm, 0x0015, 0xAFA0);
udelay(1);
@ -1309,6 +1313,8 @@ static u16 bcm43xx_phy_lo_b_r15_loop(struct bcm43xx_private *bcm)
udelay(40);
ret += bcm43xx_phy_read(bcm, 0x002C);
}
local_irq_restore(flags);
bcm43xx_voluntary_preempt();
return ret;
}
@ -1435,6 +1441,7 @@ u16 bcm43xx_phy_lo_g_deviation_subval(struct bcm43xx_private *bcm, u16 control)
}
ret = bcm43xx_phy_read(bcm, 0x002D);
local_irq_restore(flags);
bcm43xx_voluntary_preempt();
return ret;
}
@ -1760,6 +1767,7 @@ void bcm43xx_phy_lo_g_measure(struct bcm43xx_private *bcm)
bcm43xx_radio_write16(bcm, 0x43, i);
bcm43xx_radio_write16(bcm, 0x52, radio->txctl2);
udelay(10);
bcm43xx_voluntary_preempt();
bcm43xx_phy_set_baseband_attenuation(bcm, j * 2);
@ -1803,6 +1811,7 @@ void bcm43xx_phy_lo_g_measure(struct bcm43xx_private *bcm)
radio->txctl2
| (3/*txctl1*/ << 4));//FIXME: shouldn't txctl1 be zero here and 3 in the loop above?
udelay(10);
bcm43xx_voluntary_preempt();
bcm43xx_phy_set_baseband_attenuation(bcm, j * 2);
@ -1824,6 +1833,7 @@ void bcm43xx_phy_lo_g_measure(struct bcm43xx_private *bcm)
bcm43xx_phy_write(bcm, 0x0812, (r27 << 8) | 0xA2);
udelay(2);
bcm43xx_phy_write(bcm, 0x0812, (r27 << 8) | 0xA3);
bcm43xx_voluntary_preempt();
} else
bcm43xx_phy_write(bcm, 0x0015, r27 | 0xEFA0);
bcm43xx_phy_lo_adjust(bcm, is_initializing);
@ -2188,12 +2198,6 @@ int bcm43xx_phy_init(struct bcm43xx_private *bcm)
{
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
int err = -ENODEV;
unsigned long flags;
/* We do not want to be preempted while calibrating
* the hardware.
*/
local_irq_save(flags);
switch (phy->type) {
case BCM43xx_PHYTYPE_A:
@ -2227,7 +2231,6 @@ int bcm43xx_phy_init(struct bcm43xx_private *bcm)
err = 0;
break;
}
local_irq_restore(flags);
if (err)
printk(KERN_WARNING PFX "Unknown PHYTYPE found!\n");