public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-04 08:17:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

e1000e: convert .adjfreq to .adjfine

Browse source 
The PTP implementation for the e1000e driver uses the older .adjfreq
method. This method takes an adjustment in parts per billion. The newer
.adjfine implementation uses scaled_ppm. The use of scaled_ppm allows for
finer grained adjustments and is preferred over using the older
implementation.

Make use of mul_u64_u64_div_u64 in order to handle possible overflow of the
multiplication used to calculate the desired adjustment to the hardware
increment value.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Jacob Keller 2022-07-21 14:29:57 -07:00 • committed by Tony Nguyen
parent ab8e8db27e
commit abab010f16
3 changed files with 11 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/net/ethernet/intel/e1000e/e1000.h
View file

@ -329,7 +329,7 @@ struct e1000_adapter {
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_clock_info;
struct pm_qos_request pm_qos_req;
s32 ptp_delta;
long ptp_delta;
u16 eee_advert;
};

4
drivers/net/ethernet/intel/e1000e/netdev.c
View file

@ -3922,9 +3922,9 @@ static void e1000e_systim_reset(struct e1000_adapter *adapter)
if (!(adapter->flags & FLAG_HAS_HW_TIMESTAMP))
return;
if (info->adjfreq) {
if (info->adjfine) {
/* restore the previous ptp frequency delta */
ret_val = info->adjfreq(info, adapter->ptp_delta);
ret_val = info->adjfine(info, adapter->ptp_delta);
} else {
/* set the default base frequency if no adjustment possible */
ret_val = e1000e_get_base_timinca(adapter, &timinca);

15
drivers/net/ethernet/intel/e1000e/ptp.c
View file

@ -15,14 +15,16 @@
#endif
/**
* e1000e_phc_adjfreq - adjust the frequency of the hardware clock
* e1000e_phc_adjfine - adjust the frequency of the hardware clock
* @ptp: ptp clock structure
* @delta: Desired frequency change in parts per billion
* @delta: Desired frequency chance in scaled parts per million
*
* Adjust the frequency of the PHC cycle counter by the indicated delta from
* the base frequency.
*
* Scaled parts per million is ppm but with a 16 bit binary fractional field.
**/
static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
static int e1000e_phc_adjfine(struct ptp_clock_info *ptp, long delta)
{
struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
ptp_clock_info);
@ -47,9 +49,8 @@ static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;
adjustment = incvalue;
adjustment *= delta;
adjustment = div_u64(adjustment, 1000000000);
adjustment = mul_u64_u64_div_u64(incvalue, (u64)delta,
1000000ULL << 16);
incvalue = neg_adj ? (incvalue - adjustment) : (incvalue + adjustment);
@ -257,7 +258,7 @@ static const struct ptp_clock_info e1000e_ptp_clock_info = {
.n_per_out = 0,
.n_pins = 0,
.pps = 0,
.adjfreq = e1000e_phc_adjfreq,
.adjfine = e1000e_phc_adjfine,
.adjtime = e1000e_phc_adjtime,
.gettimex64 = e1000e_phc_gettimex,
.settime64 = e1000e_phc_settime,