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nexedi
linux
Commits
97944ab0
Commit
97944ab0
authored
Aug 13, 2003
by
Dave Jones
Committed by
Linus Torvalds
Aug 13, 2003
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Plain Diff
[PATCH] cpu_relax whilst in busy-wait loops.
parent
dfeee41e
Changes
1
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Inline
Side-by-side
Showing
1 changed file
with
32 additions
and
15 deletions
+32
-15
drivers/char/drm/gamma_dma.c
drivers/char/drm/gamma_dma.c
+32
-15
No files found.
drivers/char/drm/gamma_dma.c
View file @
97944ab0
...
...
@@ -44,9 +44,14 @@ static inline void gamma_dma_dispatch(drm_device_t *dev, unsigned long address,
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
mb
();
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_DMAADDRESS
,
address
);
while
(
GAMMA_READ
(
GAMMA_GCOMMANDSTATUS
)
!=
4
);
while
(
GAMMA_READ
(
GAMMA_GCOMMANDSTATUS
)
!=
4
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_DMACOUNT
,
length
/
4
);
}
...
...
@@ -54,16 +59,18 @@ void gamma_dma_quiescent_single(drm_device_t *dev)
{
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
));
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
))
cpu_relax
();
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_FILTERMODE
,
1
<<
10
);
GAMMA_WRITE
(
GAMMA_SYNC
,
0
);
do
{
while
(
!
GAMMA_READ
(
GAMMA_OUTFIFOWORDS
))
;
cpu_relax
()
;
}
while
(
GAMMA_READ
(
GAMMA_OUTPUTFIFO
)
!=
GAMMA_SYNC_TAG
);
}
...
...
@@ -71,9 +78,11 @@ void gamma_dma_quiescent_dual(drm_device_t *dev)
{
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
));
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
))
cpu_relax
();
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_BROADCASTMASK
,
3
);
GAMMA_WRITE
(
GAMMA_FILTERMODE
,
1
<<
10
);
...
...
@@ -81,12 +90,14 @@ void gamma_dma_quiescent_dual(drm_device_t *dev)
/* Read from first MX */
do
{
while
(
!
GAMMA_READ
(
GAMMA_OUTFIFOWORDS
));
while
(
!
GAMMA_READ
(
GAMMA_OUTFIFOWORDS
))
cpu_relax
();
}
while
(
GAMMA_READ
(
GAMMA_OUTPUTFIFO
)
!=
GAMMA_SYNC_TAG
);
/* Read from second MX */
do
{
while
(
!
GAMMA_READ
(
GAMMA_OUTFIFOWORDS
+
0x10000
));
while
(
!
GAMMA_READ
(
GAMMA_OUTFIFOWORDS
+
0x10000
))
cpu_relax
();
}
while
(
GAMMA_READ
(
GAMMA_OUTPUTFIFO
+
0x10000
)
!=
GAMMA_SYNC_TAG
);
}
...
...
@@ -94,14 +105,15 @@ void gamma_dma_ready(drm_device_t *dev)
{
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
));
while
(
GAMMA_READ
(
GAMMA_DMACOUNT
))
cpu_relax
();
}
static
inline
int
gamma_dma_is_ready
(
drm_device_t
*
dev
)
{
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
return
(
!
GAMMA_READ
(
GAMMA_DMACOUNT
));
return
(
!
GAMMA_READ
(
GAMMA_DMACOUNT
));
}
irqreturn_t
gamma_dma_service
(
int
irq
,
void
*
device
,
struct
pt_regs
*
regs
)
...
...
@@ -113,7 +125,9 @@ irqreturn_t gamma_dma_service(int irq, void *device, struct pt_regs *regs)
atomic_inc
(
&
dev
->
counts
[
6
]);
/* _DRM_STAT_IRQ */
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_GDELAYTIMER
,
0xc350
/
2
);
/* 0x05S */
GAMMA_WRITE
(
GAMMA_GCOMMANDINTFLAGS
,
8
);
GAMMA_WRITE
(
GAMMA_GINTFLAGS
,
0x2001
);
...
...
@@ -824,7 +838,8 @@ void DRM(driver_irq_preinstall)( drm_device_t *dev ) {
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
2
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_GCOMMANDMODE
,
0x00000004
);
GAMMA_WRITE
(
GAMMA_GDMACONTROL
,
0x00000000
);
...
...
@@ -834,7 +849,8 @@ void DRM(driver_irq_postinstall)( drm_device_t *dev ) {
drm_gamma_private_t
*
dev_priv
=
(
drm_gamma_private_t
*
)
dev
->
dev_private
;
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_GINTENABLE
,
0x00002001
);
GAMMA_WRITE
(
GAMMA_COMMANDINTENABLE
,
0x00000008
);
...
...
@@ -847,7 +863,8 @@ void DRM(driver_irq_uninstall)( drm_device_t *dev ) {
if
(
!
dev_priv
)
return
;
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
);
while
(
GAMMA_READ
(
GAMMA_INFIFOSPACE
)
<
3
)
cpu_relax
();
GAMMA_WRITE
(
GAMMA_GDELAYTIMER
,
0x00000000
);
GAMMA_WRITE
(
GAMMA_COMMANDINTENABLE
,
0x00000000
);
...
...
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