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![]() Some drivers have hardware capability to get the precise HW timestamp
of certain events based on which the fences are triggered. The delta
between the event HW timestamp & current HW reference timestamp can
be used to calculate the timestamp in kernel's CLOCK_MONOTONIC time
domain. This allows it to set accurate timestamp factoring out any
software and IRQ latencies. Add a timestamp variant of fence signal
function, dma_fence_signal_timestamp to allow drivers to update the
precise timestamp for fences.
Changes in v2:
- Add a new fence signal variant instead of modifying fence struct
Changes in v3:
- Add timestamp domain information to commit-text and
dma_fence_signal_timestamp documentation
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>
Reviewed-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
[sumits: minor parenthesis alignment]
Link: https://patchwork.freedesktop.org/patch/msgid/1610757107-11892-1-git-send-email-veeras@codeaurora.org
(cherry picked from commit
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.. | ||
heaps | ||
dma-buf.c | ||
dma-fence-array.c | ||
dma-fence-chain.c | ||
dma-fence.c | ||
dma-heap.c | ||
dma-resv.c | ||
Kconfig | ||
Makefile | ||
selftest.c | ||
selftest.h | ||
selftests.h | ||
seqno-fence.c | ||
st-dma-fence-chain.c | ||
st-dma-fence.c | ||
sw_sync.c | ||
sync_debug.c | ||
sync_debug.h | ||
sync_file.c | ||
sync_trace.h | ||
udmabuf.c |