diff mbox series

[net-next,v6,4/6] ptp: clockmatrix: dco input-to-output delay is 20 FOD cycles + 8ns

Message ID PH7PR03MB7064A9C11FB1252AEED5EF13A082A@PH7PR03MB7064.namprd03.prod.outlook.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [net-next,v6,1/6] ptp: clockmatrix: support 32-bit address space | expand

Checks

Context Check Description
netdev/series_format warning Series does not have a cover letter
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1115 this patch: 1115
netdev/cc_maintainers success CCed 2 of 2 maintainers
netdev/build_clang success Errors and warnings before: 1142 this patch: 1142
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1142 this patch: 1142
netdev/checkpatch warning WARNING: Missing commit description - Add an appropriate one
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Min Li Nov. 30, 2023, 6:46 p.m. UTC 
From: Min Li <min.li.xe@renesas.com>

Signed-off-by: Min Li <min.li.xe@renesas.com>
---
 drivers/ptp/ptp_clockmatrix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Jakub Kicinski Dec. 5, 2023, 2:44 a.m. UTC | #1 
On Thu, 30 Nov 2023 13:46:32 -0500 Min Li wrote:
> From: Min Li <min.li.xe@renesas.com>

This one is missing a commit message.
diff mbox series

Patch

diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index d069b6e451ef..21f3a2c179f5 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -2165,7 +2165,7 @@  static int configure_channel_pll(struct idtcm_channel *channel)
 
 /*
  * Compensate for the PTP DCO input-to-output delay.
- * This delay is 18 FOD cycles.
+ * This delay is 20 FOD cycles + 8ns.
  */
 static u32 idtcm_get_dco_delay(struct idtcm_channel *channel)
 {
@@ -2196,7 +2196,7 @@  static u32 idtcm_get_dco_delay(struct idtcm_channel *channel)
 	fodFreq = (u32)div_u64(m, n);
 
 	if (fodFreq >= 500000000)
-		return (u32)div_u64(18 * (u64)NSEC_PER_SEC, fodFreq);
+		return (u32)div_u64(20 * (u64)NSEC_PER_SEC, fodFreq) + 8;
 
 	return 0;
 }