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Subject[PATCH 3.12 44/77] sfc: Maintain current frequency adjustment when applying a time offset
Date
3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <bhutchings@solarflare.com>

[ Upstream commit cd6fe65e923175e4f2e9fb585b1d78c6bf580fc6 ]

There is a single MCDI PTP operation for setting the frequency
adjustment and applying a time offset to the hardware clock. When
applying a time offset we should not change the frequency adjustment.

These two operations can now be requested separately but this requires
a flash firmware update. Keep using the single operation, but
remember and repeat the previous frequency adjustment.

Fixes: 7c236c43b838 ('sfc: Add support for IEEE-1588 PTP')
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/sfc/ptp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1426,7 +1426,7 @@ static int efx_phc_adjfreq(struct ptp_cl
if (rc != 0)
return rc;

- ptp_data->current_adjfreq = delta;
+ ptp_data->current_adjfreq = adjustment_ns;
return 0;
}

@@ -1441,7 +1441,7 @@ static int efx_phc_adjtime(struct ptp_cl

MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST);
MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0);
- MCDI_SET_QWORD(inbuf, PTP_IN_ADJUST_FREQ, 0);
+ MCDI_SET_QWORD(inbuf, PTP_IN_ADJUST_FREQ, ptp_data->current_adjfreq);
MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec);
MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec);
return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),



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