diff options
| author | Keith Packard <keithp@keithp.com> | 2008-10-14 17:18:45 -0700 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2008-10-16 14:10:11 +1000 |
| commit | 44d494417278e49f5b42bd3ded1801b6d2254db8 (patch) | |
| tree | cb4cc026102f45995b417aa7656763bbdeaebc49 /drivers | |
| parent | 82e14a6215cbc9804ecc35281e973c6c8ce22fe7 (diff) | |
| download | linux-stable-44d494417278e49f5b42bd3ded1801b6d2254db8.tar.gz linux-stable-44d494417278e49f5b42bd3ded1801b6d2254db8.tar.bz2 linux-stable-44d494417278e49f5b42bd3ded1801b6d2254db8.zip | |
agp/intel: Reduce extraneous PCI posting reads during init
Instead of doing a posting read after each GTT entry update, do a single one
at the end of the writes. This should reduce boot time a tiny amount by
avoiding a lot of extra uncached reads.
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/agp/intel-agp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c index f1fe74901314..81f094244471 100644 --- a/drivers/char/agp/intel-agp.c +++ b/drivers/char/agp/intel-agp.c @@ -214,8 +214,8 @@ static int intel_i810_configure(void) if (agp_bridge->driver->needs_scratch_page) { for (i = 0; i < current_size->num_entries; i++) { writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4)); - readl(intel_private.registers+I810_PTE_BASE+(i*4)); /* PCI posting. */ } + readl(intel_private.registers+I810_PTE_BASE+((i-1)*4)); /* PCI posting. */ } global_cache_flush(); return 0; @@ -775,8 +775,8 @@ static int intel_i830_configure(void) if (agp_bridge->driver->needs_scratch_page) { for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) { writel(agp_bridge->scratch_page, intel_private.registers+I810_PTE_BASE+(i*4)); - readl(intel_private.registers+I810_PTE_BASE+(i*4)); /* PCI Posting. */ } + readl(intel_private.registers+I810_PTE_BASE+((i-1)*4)); /* PCI Posting. */ } global_cache_flush(); @@ -991,8 +991,8 @@ static int intel_i915_configure(void) if (agp_bridge->driver->needs_scratch_page) { for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) { writel(agp_bridge->scratch_page, intel_private.gtt+i); - readl(intel_private.gtt+i); /* PCI Posting. */ } + readl(intel_private.gtt+i-1); /* PCI Posting. */ } global_cache_flush(); |