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Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Tom Lendacky , Shyam Sundar S K , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Siva Reddy Kallam , Prashant Sreedharan , Michael Chan , Yisen Zhuang , Salil Mehta , Jesse Brandeburg , Tony Nguyen , Tariq Toukan , Saeed Mahameed , Leon Romanovsky , Bryan Whitehead , Sergey Shtylyov , Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , Maxime Coquelin , Richard Cochran , Vivek Thampi , VMware PV-Drivers Reviewers , Jie Wang , Guangbin Huang , Eran Ben Elisha , Aya Levin , Cai Huoqing , Biju Das , Lad Prabhakar , Phil Edworthy , Jiasheng Jiang , "Gustavo A. R. Silva" , Linus Walleij , Wan Jiabing , Lv Ruyi , Arnd Bergmann Subject: [net-next 12/14] ptp: stmac: convert to .adjfine and adjust_by_scaled_ppm Date: Thu, 18 Aug 2022 15:27:40 -0700 Message-Id: <20220818222742.1070935-13-jacob.e.keller@intel.com> X-Mailer: git-send-email 2.37.1.394.gc50926e1f488 In-Reply-To: <20220818222742.1070935-1-jacob.e.keller@intel.com> References: <20220818222742.1070935-1-jacob.e.keller@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The stmac implementation of .adjfreq is implemented in terms of a straight forward "base * ppb / 1 billion" calculation. Convert this driver to .adjfine and use the adjust_by_scaled_ppm helper function to perform the calculation of the new addend. Signed-off-by: Jacob Keller Cc: Giuseppe Cavallaro Cc: Alexandre Torgue Cc: Jose Abreu --- I do not have this hardware, and have only compile tested the change. .../net/ethernet/stmicro/stmmac/stmmac_ptp.c | 23 ++++++------------- 1 file changed, 7 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c index 4d11980dcd64..0d5e6819ee5d 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c @@ -15,29 +15,20 @@ * stmmac_adjust_freq * * @ptp: pointer to ptp_clock_info structure - * @ppb: desired period change in parts ber billion + * @scaled_ppm: desired period change in scaled parts per million * * Description: this function will adjust the frequency of hardware clock. + * + * Scaled parts per million is ppm with a 16-bit binary fractional field. */ -static int stmmac_adjust_freq(struct ptp_clock_info *ptp, s32 ppb) +static int stmmac_adjust_freq(struct ptp_clock_info *ptp, long scaled_ppm) { struct stmmac_priv *priv = container_of(ptp, struct stmmac_priv, ptp_clock_ops); unsigned long flags; - u32 diff, addend; - int neg_adj = 0; - u64 adj; + u32 addend; - if (ppb < 0) { - neg_adj = 1; - ppb = -ppb; - } - - addend = priv->default_addend; - adj = addend; - adj *= ppb; - diff = div_u64(adj, 1000000000ULL); - addend = neg_adj ? (addend - diff) : (addend + diff); + addend = (u32)adjust_by_scaled_ppm(priv->default_addend, scaled_ppm); write_lock_irqsave(&priv->ptp_lock, flags); stmmac_config_addend(priv, priv->ptpaddr, addend); @@ -269,7 +260,7 @@ static struct ptp_clock_info stmmac_ptp_clock_ops = { .n_per_out = 0, /* will be overwritten in stmmac_ptp_register */ .n_pins = 0, .pps = 0, - .adjfreq = stmmac_adjust_freq, + .adjfine = stmmac_adjust_freq, .adjtime = stmmac_adjust_time, .gettime64 = stmmac_get_time, .settime64 = stmmac_set_time, -- 2.37.1.208.ge72d93e88cb2