netdev - [net-next v2 7/9] ptp: lan743x: use diff_by_scaled

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Message-Id: <20220930204851.1910059-8-jacob.e.keller@intel.com>
Date:   Fri, 30 Sep 2022 13:48:49 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     netdev@...r.kernel.org
Cc:     Jacob Keller <jacob.e.keller@...el.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vivek Thampi <vithampi@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Jie Wang <wangjie125@...wei.com>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Eran Ben Elisha <eranbe@...dia.com>,
        Aya Levin <ayal@...dia.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Wan Jiabing <wanjiabing@...o.com>,
        Lv Ruyi <lv.ruyi@....com.cn>, Arnd Bergmann <arnd@...db.de>,
        UNGLinuxDriver@...rochip.com
Subject: [net-next v2 7/9] ptp: lan743x: use diff_by_scaled_ppm in .adjfine implementation

Update the lan743x driver to use the recently added diff_by_scaled_ppm
helper function. This reduces the amount of code required in lan743x_ptp.c
driver file.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Cc: Bryan Whitehead <bryan.whitehead@...rochip.com>
Cc: UNGLinuxDriver@...rochip.com
---
 drivers/net/ethernet/microchip/lan743x_ptp.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ptp.c b/drivers/net/ethernet/microchip/lan743x_ptp.c
index 130f88b77cfe..c232af22ff02 100644
--- a/drivers/net/ethernet/microchip/lan743x_ptp.c
+++ b/drivers/net/ethernet/microchip/lan743x_ptp.c
@@ -339,25 +339,18 @@ static int lan743x_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
 	struct lan743x_adapter *adapter =
 		container_of(ptp, struct lan743x_adapter, ptp);
 	u32 lan743x_rate_adj = 0;
-	bool positive = true;
-	u64 u64_delta = 0;
+	u64 u64_delta;
 
 	if ((scaled_ppm < (-LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM)) ||
 	    scaled_ppm > LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM) {
 		return -EINVAL;
 	}
-	if (scaled_ppm > 0) {
-		u64_delta = (u64)scaled_ppm;
-		positive = true;
-	} else {
-		u64_delta = (u64)(-scaled_ppm);
-		positive = false;
-	}
-	u64_delta = (u64_delta << 19);
-	lan743x_rate_adj = div_u64(u64_delta, 1000000);
 
-	if (positive)
-		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
+	/* diff_by_scaled_ppm returns true if the difference is negative */
+	if (diff_by_scaled_ppm(1ULL << 35, scaled_ppm, &u64_delta))
+		lan743x_rate_adj = (u32)u64_delta;
+	else
+		lan743x_rate_adj = (u32)u64_delta | PTP_CLOCK_RATE_ADJ_DIR_;
 
 	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
 			  lan743x_rate_adj);
-- 
2.37.1.394.gc50926e1f488