linux-kernel - [PATCH net-next v2 2/5] net: stmmac: use correct PPS capture input index

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Message-Id: <20231010-stmmac_fix_auxiliary_event_capture-v2-2-51d5f56542d7@pengutronix.de>
Date:   Wed, 18 Oct 2023 09:09:54 +0200
From:   Johannes Zink <j.zink@...gutronix.de>
To:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Cc:     patchwork-jzi@...gutronix.de, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, vee.khee.wong@...ux.intel.com,
        tee.min.tan@...el.com, rmk+kernel@...linux.org.uk,
        bartosz.golaszewski@...aro.org, ahalaney@...hat.com,
        horms@...nel.org, Johannes Zink <j.zink@...gutronix.de>
Subject: [PATCH net-next v2 2/5] net: stmmac: use correct PPS capture input
 index

The stmmac supports up to 4 auxiliary snapshots that can be enabled by
setting the appropriate bits in the PTP_ACR bitfield.

Previously as of commit f4da56529da6 ("net: stmmac: Add support for
external trigger timestamping") instead of setting the bits, a fixed
value was written to this bitfield instead of passing the appropriate
bitmask.

Now the correct bit is set according to the ptp_clock_request.extts_index
passed as a parameter to stmmac_enable().

Signed-off-by: Johannes Zink <j.zink@...gutronix.de>

---

Changelog:

v1 > v2: no functional changes. reword commit message and remove fixes-tag
as discussed with Simon and Jakub. Thanks to both for reviewing my patches!
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 5 ++---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index f110b91af9bd..300e673d2a36 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -201,12 +201,11 @@ static int stmmac_enable(struct ptp_clock_info *ptp,
 		acr_value &= ~PTP_ACR_MASK;
 		if (on) {
 			/* Enable External snapshot trigger */
-			acr_value |= priv->plat->ext_snapshot_num;
+			acr_value |= PTP_ACR_ATSEN(rq->extts.index);
 			acr_value |= PTP_ACR_ATSFC;
 		}
 		netdev_dbg(priv->dev, "Auxiliary Snapshot %d %s.\n",
-			   priv->plat->ext_snapshot_num >> PTP_ACR_ATSEN_SHIFT,
-			   on ? "enabled" : "disabled");
+			   rq->extts.index, on ? "enabled" : "disabled");
 		writel(acr_value, ptpaddr + PTP_ACR);
 		mutex_unlock(&priv->aux_ts_lock);
 		/* wait for auxts fifo clear to finish */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
index d1fe4b46f162..fce3fba2ffd2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
@@ -79,7 +79,7 @@
 #define	PTP_ACR_ATSEN1		BIT(5)	/* Auxiliary Snapshot 1 Enable */
 #define	PTP_ACR_ATSEN2		BIT(6)	/* Auxiliary Snapshot 2 Enable */
 #define	PTP_ACR_ATSEN3		BIT(7)	/* Auxiliary Snapshot 3 Enable */
-#define	PTP_ACR_ATSEN_SHIFT	5	/* Auxiliary Snapshot shift */
+#define	PTP_ACR_ATSEN(index)	(PTP_ACR_ATSEN0 << (index))
 #define	PTP_ACR_MASK		GENMASK(7, 4)	/* Aux Snapshot Mask */
 #define	PMC_ART_VALUE0		0x01	/* PMC_ART[15:0] timer value */
 #define	PMC_ART_VALUE1		0x02	/* PMC_ART[31:16] timer value */

-- 
2.39.2