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| author | Ajit Pal Singh <quic_ajitpals@quicinc.com> | 2023-10-16 19:01:13 +0200 |
|---|---|---|
| committer | Jeffrey Hugo <quic_jhugo@quicinc.com> | 2023-10-27 18:05:42 +0200 |
| commit | 6216fb03f8bd0b1439e9e799a306bafd5b462622 (patch) | |
| tree | e9f59cf8c8cf251b41d01de7e23a1f007c1d3a0a /Documentation/accel | |
| parent | accel/qaic: Enable 1 MSI fallback mode (diff) | |
| download | linux-6216fb03f8bd0b1439e9e799a306bafd5b462622.tar.xz linux-6216fb03f8bd0b1439e9e799a306bafd5b462622.zip | |
accel/qaic: Add support for periodic timesync
Device and Host have a time synchronization mechanism that happens once
during boot when device is in SBL mode. After that, in mission-mode there
is no timesync. In an experiment after continuous operation, device time
drifted w.r.t. host by approximately 3 seconds per day. This drift leads
to mismatch in timestamp of device and Host logs. To correct this
implement periodic timesync in driver. This timesync is carried out via
QAIC_TIMESYNC_PERIODIC MHI channel.
Signed-off-by: Ajit Pal Singh <quic_ajitpals@quicinc.com>
Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Carl Vanderlip <quic_carlv@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231016170114.5446-2-quic_jhugo@quicinc.com
Diffstat (limited to 'Documentation/accel')
| -rw-r--r-- | Documentation/accel/qaic/aic100.rst | 4 | ||||
| -rw-r--r-- | Documentation/accel/qaic/qaic.rst | 5 |
2 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/accel/qaic/aic100.rst b/Documentation/accel/qaic/aic100.rst index a5fef0869aab..2ed32be7ae25 100644 --- a/Documentation/accel/qaic/aic100.rst +++ b/Documentation/accel/qaic/aic100.rst @@ -225,6 +225,10 @@ of the defined channels, and their uses. | | | | device side logs with the host time | | | | | source. | +----------------+---------+----------+----------------------------------------+ +| QAIC_TIMESYNC | 22 & 23 | AMSS | Used to periodically synchronize | +| _PERIODIC | | | timestamps in the device side logs with| +| | | | the host time source. | ++----------------+---------+----------+----------------------------------------+ DMA Bridge ========== diff --git a/Documentation/accel/qaic/qaic.rst b/Documentation/accel/qaic/qaic.rst index 9ccbfea86f5a..f81020736ebf 100644 --- a/Documentation/accel/qaic/qaic.rst +++ b/Documentation/accel/qaic/qaic.rst @@ -201,3 +201,8 @@ overrides this for that call. Default is 5000 (5 seconds). Sets the polling interval in microseconds (us) when datapath polling is active. Takes effect at the next polling interval. Default is 100 (100 us). + +**timesync_delay_ms (unsigned int)** + +Sets the time interval in milliseconds (ms) between two consecutive timesync +operations. Default is 1000 (1000 ms). |