Hi,
[sending as plain text to l-o]
Could you please comment on this patch.
From: Sripal Bagadia <bagadia@xxxxxx>
Date: Tue, 9 Jun 2009 16:05:09 -0500
Subject: [PATCH] DSPBRIDGE: Video Playback Cache Optimization
Avoid get_user_pages cache flush overheads for uncached & reserved
buffers (e.g. display & camera buffers).
Signed-off-by: Sripal Bagadia <bagadia@xxxxxx>
---
drivers/dsp/bridge/wmd/tiomap3430.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/dsp/bridge/wmd/tiomap3430.c b/drivers/dsp/bridge/wmd/tiomap3430.c
index 7a9603d..a2f32e8 100644
--- a/drivers/dsp/bridge/wmd/tiomap3430.c
+++ b/drivers/dsp/bridge/wmd/tiomap3430.c
@@ -1461,7 +1461,9 @@ static DSP_STATUS WMD_BRD_MemMap(struct WMD_DEV_CONTEXT *hDevContext,
goto func_cont;
}
- if (vma->vm_flags & VM_IO) {
+ if ((vma->vm_flags & VM_IO) | ((vma->vm_flags & VM_RESERVED) &&
+ (~pgprot_val(vma->vm_page_prot) & L_PTE_CACHEABLE) &&
+ (~pgprot_val(vma->vm_page_prot) & L_PTE_BUFFERABLE))) {
numUsrPgs = ulNumBytes / PG_SIZE_4K;
mpuAddr = ulMpuAddr;
DBG_Trace(DBG_LEVEL4, "WMD_BRD_MemMap:numOfActualTabEntries=%d,"
--
1.6.2.4
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