ptp: increase maximum adjustment of virtual clocks.

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 <[email protected]> Acked-by: Richard Cochran <[email protected]> Cc: Yangbo Lu <[email protected]> Signed-off-by: David S. Miller <[email protected]>
josf · Feb 3, 2022 · f77222d · f77222d
1 parent bfcbb76
commit f77222d
Showing 1 changed file with 1 addition and 2 deletions.
diff --git 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,