netdev - [PATCH net-next 3/3] bnxt: Enforce PTP software freq adjustments only when in non-RTC mode

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Date:   Tue, 21 Mar 2023 03:32:27 -0700
From:   Pavan Chebbi <pavan.chebbi@...adcom.com>
To:     michael.chan@...adcom.com, kuba@...nel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, gospo@...adcom.com,
        netdev@...r.kernel.org, pabeni@...hat.com,
        richardcochran@...il.com, Pavan Chebbi <pavan.chebbi@...adcom.com>
Subject: [PATCH net-next 3/3] bnxt: Enforce PTP software freq adjustments only when in non-RTC mode

Currently driver performs software based frequency adjustments
when RTC capability is not discovered or when in shared PHC mode.
But there may be some old firmware versions that still support
hardware freq adjustments without RTC capability being exposed.
In this situation driver will use non-realtime mode even on single
host NICs.

Hence enforce software frequency adjustments only when running in
shared PHC mode. Make suitable changes for cyclecounter for the
same.

Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Reviewed-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index a3a3978a4d1c..b79a186f864c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -230,7 +230,7 @@ static int bnxt_ptp_adjfine(struct ptp_clock_info *ptp_info, long scaled_ppm)
 						ptp_info);
 	struct bnxt *bp = ptp->bp;
 
-	if (BNXT_PTP_USE_RTC(bp))
+	if (!BNXT_MH(ptp->bp))
 		return bnxt_ptp_adjfine_rtc(bp, scaled_ppm);
 
 	spin_lock_bh(&ptp->ptp_lock);
@@ -861,9 +861,15 @@ static void bnxt_ptp_timecounter_init(struct bnxt *bp, bool init_tc)
 		memset(&ptp->cc, 0, sizeof(ptp->cc));
 		ptp->cc.read = bnxt_cc_read;
 		ptp->cc.mask = CYCLECOUNTER_MASK(48);
-		ptp->cc.shift = BNXT_CYCLES_SHIFT;
-		ptp->cc.mult = clocksource_khz2mult(BNXT_DEVCLK_FREQ, ptp->cc.shift);
-		ptp->cmult = ptp->cc.mult;
+		if (BNXT_MH(ptp->bp)) {
+			/* Use timecounter based non-real time mode */
+			ptp->cc.shift = BNXT_CYCLES_SHIFT;
+			ptp->cc.mult = clocksource_khz2mult(BNXT_DEVCLK_FREQ, ptp->cc.shift);
+			ptp->cmult = ptp->cc.mult;
+		} else {
+			ptp->cc.shift = 0;
+			ptp->cc.mult = 1;
+		}
 		ptp->next_overflow_check = jiffies + BNXT_PHC_OVERFLOW_PERIOD;
 	}
 	if (init_tc)
-- 
2.39.1


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