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In host1x_syncpt_wait(), the hardware syncpoint value was loaded initially for expiry check, and then loaded a second time to populate the caller's value pointer. Reuse a single load for both purposes. After dma_fence_wait_timeout(), the previous code reloaded the syncpoint value for the expiry check, which is only required in the timeout case. On success (i.e., return value > 0, or return value == 0 with zero jiffies remaining), the ISR has already cached the value before signaling the fence. The value pointer can therefore be populated using the cached value using host1x_syncpt_read_min() without MMIO access. Only the timeout path requires a fresh load, move host1x_syncpt_load() under that path. Measured Syncpoint wait latency (50000 samples): Average latency: 12.2 us -> 10.6 us 99.99 pct latency: 62.96 us -> 51.90 us Signed-off-by: Tanmay Patil <tanmayp@nvidia.com> Acked-by: Mikko Perttunen <mperttunen@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://patch.msgid.link/20260514103153.766343-2-tanmayp@nvidia.com
535 lines
12 KiB
535 lines
12 KiB