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msm: kgsl: increase valid timestamp range

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The existing timestamp_cmp function returns a different
result depending on the order of the input parameters due to
having an asymetric valid window. When no rollover is
detected the window is 2^31 but when a rollover is detected
the window is 25000. This change makes the rollover window
symmetric at 2^31.
This commit is contained in:
securecrt 2012-06-21 12:34:57 +08:00
parent d319fcfbbd
commit aa5de9cfcb
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/msm/kgsl.h
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@ -24,6 +24,9 @@
#define KGSL_NAME "kgsl"
/* Timestamp window used to detect rollovers */
#define KGSL_TIMESTAMP_WINDOW 0x80000000
/*cache coherency ops */
#define DRM_KGSL_GEM_CACHE_OP_TO_DEV 0x0001
#define DRM_KGSL_GEM_CACHE_OP_FROM_DEV 0x0002
@ -193,7 +196,7 @@ static inline int timestamp_cmp(unsigned int new, unsigned int old)
if (ts_diff == 0)
return 0;
return ((ts_diff > 0) || (ts_diff < -20000)) ? 1 : -1;
return ((ts_diff > 0) || (ts_diff < -KGSL_TIMESTAMP_WINDOW)) ? 1 : -1;
}
static inline void