linux-kernel - [RFC PATCH 1/2] net: macb: Add separate definition for PPM fraction

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Date:   Mon, 18 Mar 2019 18:01:51 +0530
From:   Harini Katakam <harini.katakam@...inx.com>
To:     <nicolas.ferre@...rochip.com>, <davem@...emloft.net>,
        <richardcochran@...il.com>, <claudiu.beznea@...rochip.com>,
        <rafalo@...ence.com>, <andrei.pistirica@...rochip.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <michal.simek@...inx.com>, <harinikatakamlinux@...il.com>,
        <harini.katakam@...inx.com>
Subject: [RFC PATCH 1/2] net: macb: Add separate definition for PPM fraction

The scaled ppm parameter passed to _adjfine() contains a 16 bit
fraction. This just happens to be the same as SUBNSINCR_SIZE now.
Hence define this separately.

Signed-off-by: Harini Katakam <harini.katakam@...inx.com>
---
 drivers/net/ethernet/cadence/macb.h     | 3 +++
 drivers/net/ethernet/cadence/macb_ptp.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index acc66a7..0993949 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -837,6 +837,9 @@ struct gem_tx_ts {
 /* limit RX checksum offload to TCP and UDP packets */
 #define GEM_RX_CSUM_CHECKED_MASK		2
 
+/* Scaled PPM fraction */
+#define PPM_FRACTION	16
+
 /* struct macb_tx_skb - data about an skb which is being transmitted
  * @skb: skb currently being transmitted, only set for the last buffer
  *       of the frame
diff --git a/drivers/net/ethernet/cadence/macb_ptp.c b/drivers/net/ethernet/cadence/macb_ptp.c
index a6dc47e..46d9cdf 100644
--- a/drivers/net/ethernet/cadence/macb_ptp.c
+++ b/drivers/net/ethernet/cadence/macb_ptp.c
@@ -146,7 +146,7 @@ static int gem_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 	 * (temp / USEC_PER_SEC) + 0.5
 	 */
 	adj += (USEC_PER_SEC >> 1);
-	adj >>= GEM_SUBNSINCR_SIZE; /* remove fractions */
+	adj >>= PPM_FRACTION; /* remove fractions */
 	adj = div_u64(adj, USEC_PER_SEC);
 	adj = neg_adj ? (word - adj) : (word + adj);
 
-- 
2.7.4