6.6-stable review patch. If anyone has any objections, please let me know.
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From: Horatiu Vultur horatiu.vultur@microchip.com
[ Upstream commit 9780f535f8e0f20b4632b5a173ead71aa8f095d2 ]
To initialize the taprio block in lan966x, it is required to configure the register REVISIT_DLY. The purpose of this register is to set the delay before revisit the next gate and the value of this register depends on the system clock. The problem is that the we calculated wrong the value of the system clock period in picoseconds. The actual system clock is ~165.617754MHZ and this correspond to a period of 6038 pico seconds and not 15125 as currently set.
Fixes: e462b2717380b4 ("net: lan966x: Add offload support for taprio") Signed-off-by: Horatiu Vultur horatiu.vultur@microchip.com Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20251121061411.810571-1-horatiu.vultur@microchip.co... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c index 87e5e81d40dc6..84f5b4410e48e 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c @@ -1,11 +1,14 @@ // SPDX-License-Identifier: GPL-2.0+
#include <linux/ptp_classify.h> +#include <linux/units.h>
#include "lan966x_main.h" #include "vcap_api.h" #include "vcap_api_client.h"
+#define LAN9X66_CLOCK_RATE 165617754 + #define LAN966X_MAX_PTP_ID 512
/* Represents 1ppm adjustment in 2^59 format with 6.037735849ns as reference @@ -1132,5 +1135,5 @@ void lan966x_ptp_rxtstamp(struct lan966x *lan966x, struct sk_buff *skb, u32 lan966x_ptp_get_period_ps(void) { /* This represents the system clock period in picoseconds */ - return 15125; + return PICO / LAN9X66_CLOCK_RATE; }