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[PATCHv2,net-next,2/4] ptp: increase maximum adjustment of virtual clocks.

Message ID 20220202093358.1341391-3-mlichvar@redhat.com (mailing list archive)
State Accepted
Commit f77222d693cc04a881bcd0bded3dd1229c70d7ef
Delegated to: Netdev Maintainers
Headers show
Series Virtual PTP clock improvements and fix | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 3 of 3 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 9 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Miroslav Lichvar Feb. 2, 2022, 9:33 a.m. UTC 
Increase the maximum frequency offset of virtual clocks to 50% to enable
faster slewing corrections.

This value cannot be represented as scaled ppm when long has 32 bits,
but that is already the case for other drivers, even those that provide
the adjfine() function, i.e. 32-bit applications are expected to check
for the limit.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
---
 drivers/ptp/ptp_vclock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index ab1d233173e1..5aa2b32d9dc7 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -84,8 +84,7 @@  static long ptp_vclock_refresh(struct ptp_clock_info *ptp)
 static const struct ptp_clock_info ptp_vclock_info = {
 	.owner		= THIS_MODULE,
 	.name		= "ptp virtual clock",
-	/* The maximum ppb value that long scaled_ppm can support */
-	.max_adj	= 32767999,
+	.max_adj	= 500000000,
 	.adjfine	= ptp_vclock_adjfine,
 	.adjtime	= ptp_vclock_adjtime,
 	.gettime64	= ptp_vclock_gettime,