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charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 9/16/2022 6:14 AM, Karol Kolacinski wrote: > E823 devices on supported platforms can generate a cross timestamp > between the platform ART and the device time. This process allows for > very precise measurement of the difference between the PTP hardware > clock and the platform time. > > This is only supported if we know the TSC frequency relative to ART, so > we do not enable this unless the boot CPU has a known TSC frequency (as > required by convert_art_ns_to_tsc). > > Signed-off-by: Karol Kolacinski > --- > drivers/net/ethernet/intel/ice/ice_ptp.c | 18 ++++++++++++------ > 1 file changed, 12 insertions(+), 6 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c > index 408beddc1210..0b37e3d1ef68 100644 > --- a/drivers/net/ethernet/intel/ice/ice_ptp.c > +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c > @@ -2036,7 +2036,7 @@ ice_ptp_get_syncdevicetime(ktime_t *device, > } > > /** > - * ice_ptp_getcrosststamp_e822 - Capture a device cross timestamp > + * ice_ptp_getcrosststamp_generic - Capture a device cross timestamp IMO generic is implied if there is not a specific device put to it. I don't think we need to specifically call it generic... > * @info: the driver's PTP info structure > * @cts: The memory to fill the cross timestamp info > * > @@ -2044,15 +2044,15 @@ ice_ptp_get_syncdevicetime(ktime_t *device, > * clock. Fill the cross timestamp information and report it back to the > * caller. > * > - * This is only valid for E822 devices which have support for generating the > - * cross timestamp via PCIe PTM. > + * This is only valid for E822 and E823 devices which have support for ... however it's still kind of device specific as it's for E822 and E823. Seems like E822 functions are used for both E822 and E823 so I think leaving the name as is or, perhaps, calling it '_e82x'? > + * generating the cross timestamp via PCIe PTM. > * > * In order to correctly correlate the ART timestamp back to the TSC time, the > * CPU must have X86_FEATURE_TSC_KNOWN_FREQ. > */ > static int > -ice_ptp_getcrosststamp_e822(struct ptp_clock_info *info, > - struct system_device_crosststamp *cts) > +ice_ptp_getcrosststamp_generic(struct ptp_clock_info *info, > + struct system_device_crosststamp *cts) > { _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan