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nvethernet: change required clock freq to 250MHz

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increase required clock frequency from 62.5MHz to 250MHz
for better PTP time stamping accuracy. Switching to 250 MHz
will increase the accuracy of the PTP timestamp by ~22ns

Bug 200565215

Change-Id: I17fb6b4ea19bcb78b9b085d45b7dd9c816bcc5c9
Signed-off-by: Narayan Reddy <narayanr@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2234046
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Narayan Reddy
2019-11-07 14:29:48 +05:30
committed by Revanth Kumar Uppala
parent ae038d9360
commit a1df5ed4a8
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/nvidia/nvethernet/ptp.c
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@@ -197,7 +197,7 @@ static int ether_set_time(struct ptp_clock_info *ptp,
static struct ptp_clock_info ether_ptp_clock_ops = {
.owner = THIS_MODULE,
.name = "ether_ptp_clk",
.max_adj = OSI_ETHER_SYSCLOCK,
.max_adj = OSI_PTP_REQ_CLK_FREQ,
.n_alarm = 0,
.n_ext_ts = 0,
.n_per_out = 0,
@@ -428,8 +428,9 @@ int ether_handle_hwtstamp_ioctl(struct ether_priv_data *pdata,
osi_ptp_configuration(osi_core, OSI_DISABLE);
ether_config_slot_function(pdata, OSI_DISABLE);
} else {
/* Store SYS CLOCK */
osi_core->ptp_config.ptp_clock = OSI_ETHER_SYSCLOCK;
/* Store default PTP clock frequency, so that we
* can make use of it for coarse correction */
osi_core->ptp_config.ptp_clock = pdata->ptp_ref_clock_speed;
/* initialize system time */
getnstimeofday(&now);
/* Store sec and nsec */