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net: dsa: sja1105: Restore PTP time after switch reset

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The PTP time of the switch is not preserved when uploading a new static
configuration. Work around this hardware oddity by reading its PTP time
before a static config upload, and restoring it afterwards.

Static config changes are expected to occur at runtime even in scenarios
directly related to PTP, i.e. the Time-Aware Scheduler of the switch is
programmed in this way.

Perhaps the larger implication of this patch is that the PTP .gettimex64
and .settime functions need to be exposed to sja1105_main.c, where the
PTP lock needs to be held during this entire process. So their core
implementation needs to move to some common functions which get exposed
in sja1105_ptp.h.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
2019-11-09 13:32:23 +02:00
committed by David S. Miller
parent 34d76e9fa8
commit 6cf99c13ea
4 changed files with 114 additions and 32 deletions
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6
drivers/net/dsa/sja1105/sja1105_spi.c
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@@ -511,12 +511,6 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
dev_info(dev, "Succeeded after %d tried\n", RETRIES - retries);
}
rc = sja1105_ptp_reset(priv->ds);
if (rc < 0)
dev_err(dev, "Failed to reset PTP clock: %d\n", rc);
dev_info(dev, "Reset switch and programmed static config\n");
out:
kfree(config_buf);
return rc;