linux-kernel - [PATCH phy 09/14] phy: lynx-28g: configure more equalization params for 1GbE and 10GbE

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Message-Id: <20250904154402.300032-10-vladimir.oltean@nxp.com>
Date: Thu,  4 Sep 2025 18:43:57 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: linux-phy@...ts.infradead.org
Cc: Ioana Ciornei <ioana.ciornei@....com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH phy 09/14] phy: lynx-28g: configure more equalization params for 1GbE and 10GbE

From: Ioana Ciornei <ioana.ciornei@....com>

While adding support for 25GbE, it was noticed that the RCCR0 and TTLCR0
registers have different values for this protocol than the 10GbE and
1GbE modes.

Expand the lynx_28g_proto_conf[] array with the expected values for the
currently supported protocols. These were dumped from a live system, and
are the out-of-reset values. It will ensure that the lane is configured
with these values when transitioning from 25GbE back into one of these
modes.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/phy/freescale/phy-fsl-lynx-28g.c | 37 ++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/phy/freescale/phy-fsl-lynx-28g.c b/drivers/phy/freescale/phy-fsl-lynx-28g.c
index 49e9ea82106f..1a8751e79898 100644
--- a/drivers/phy/freescale/phy-fsl-lynx-28g.c
+++ b/drivers/phy/freescale/phy-fsl-lynx-28g.c
@@ -166,6 +166,18 @@
 #define LNaRECR4_EQ_BIN_DATA			GENMASK(8, 0) /* bit 9 is reserved */
 #define LNaRECR4_EQ_BIN_DATA_SGN		BIT(8)
 
+#define LNaRCCR0(lane)				(0x800 + (lane) * 0x100 + 0x68)
+#define LNaRCCR0_CAL_EN				BIT(31)
+#define LNaRCCR0_MEAS_EN			BIT(30)
+#define LNaRCCR0_CAL_BIN_SEL			BIT(28)
+#define LNaRCCR0_CAL_DC3_DIS			BIT(27)
+#define LNaRCCR0_CAL_DC2_DIS			BIT(26)
+#define LNaRCCR0_CAL_DC1_DIS			BIT(25)
+#define LNaRCCR0_CAL_DC0_DIS			BIT(24)
+#define LNaRCCR0_CAL_AC3_OV_EN			BIT(15)
+#define LNaRCCR0_CAL_AC3_OV			GENMASK(11, 8)
+#define LNaRCCR0_CAL_AC2_OV_EN			BIT(7)
+
 #define LNaRSCCR0(lane)				(0x800 + (lane) * 0x100 + 0x74)
 #define LNaRSCCR0_SMP_OFF_EN			BIT(31)
 #define LNaRSCCR0_SMP_OFF_OV_EN			BIT(30)
@@ -181,6 +193,15 @@
 #define LNaRSCCR0_SMP_AUTOZ_EG1R		GENMASK(5, 4)
 #define LNaRSCCR0_SMP_AUTOZ_EG1F		GENMASK(1, 0)
 
+#define LNaTTLCR0(lane)				(0x800 + (lane) * 0x100 + 0x80)
+#define LNaTTLCR0_TTL_FLT_SEL			GENMASK(29, 24)
+#define LNaTTLCR0_TTL_SLO_PM_BYP		BIT(22)
+#define LNaTTLCR0_STALL_DET_DIS			BIT(21)
+#define LNaTTLCR0_INACT_MON_DIS			BIT(20)
+#define LNaTTLCR0_CDR_OV			GENMASK(18, 16)
+#define LNaTTLCR0_DATA_IN_SSC			BIT(15)
+#define LNaTTLCR0_CDR_MIN_SMP_ON		GENMASK(1, 0)
+
 #define LNaTCSR0(lane)				(0x800 + (lane) * 0x100 + 0xa0)
 #define LNaTCSR0_SD_STAT_OBS_EN			BIT(31)
 #define LNaTCSR0_SD_LPBK_SEL			GENMASK(29, 28)
@@ -287,6 +308,10 @@ struct lynx_28g_proto_conf {
 	/* LNaRSCCR0 */
 	int smp_autoz_d1r;
 	int smp_autoz_eg1r;
+	/* LNaRCCR0 */
+	int rccr0;
+	/* LNaTTLCR0 */
+	int ttlcr0;
 };
 
 static const struct lynx_28g_proto_conf lynx_28g_proto_conf[LANE_MODE_MAX] = {
@@ -317,6 +342,9 @@ static const struct lynx_28g_proto_conf lynx_28g_proto_conf[LANE_MODE_MAX] = {
 		.spare_in = 0,
 		.smp_autoz_d1r = 0,
 		.smp_autoz_eg1r = 0,
+		.rccr0 = LNaRCCR0_CAL_EN,
+		.ttlcr0 = LNaTTLCR0_TTL_SLO_PM_BYP |
+			  LNaTTLCR0_DATA_IN_SSC,
 	},
 	[LANE_MODE_USXGMII] = {
 		.proto_sel = LNaGCR0_PROTO_SEL_XFI,
@@ -345,6 +373,9 @@ static const struct lynx_28g_proto_conf lynx_28g_proto_conf[LANE_MODE_MAX] = {
 		.spare_in = 0,
 		.smp_autoz_d1r = 2,
 		.smp_autoz_eg1r = 0,
+		.rccr0 = LNaRCCR0_CAL_EN,
+		.ttlcr0 = LNaTTLCR0_TTL_SLO_PM_BYP |
+			  LNaTTLCR0_DATA_IN_SSC,
 	},
 	[LANE_MODE_10GBASER] = {
 		.proto_sel = LNaGCR0_PROTO_SEL_XFI,
@@ -373,6 +404,9 @@ static const struct lynx_28g_proto_conf lynx_28g_proto_conf[LANE_MODE_MAX] = {
 		.spare_in = 0,
 		.smp_autoz_d1r = 2,
 		.smp_autoz_eg1r = 0,
+		.rccr0 = LNaRCCR0_CAL_EN,
+		.ttlcr0 = LNaTTLCR0_TTL_SLO_PM_BYP |
+			  LNaTTLCR0_DATA_IN_SSC,
 	},
 };
 
@@ -828,6 +862,9 @@ static void lynx_28g_lane_change_proto_conf(struct lynx_28g_lane *lane,
 			  FIELD_PREP(LNaRSCCR0_SMP_AUTOZ_EG1R, conf->smp_autoz_eg1r),
 			  LNaRSCCR0_SMP_AUTOZ_D1R |
 			  LNaRSCCR0_SMP_AUTOZ_EG1R);
+
+	lynx_28g_lane_write(lane, LNaRCCR0, conf->rccr0);
+	lynx_28g_lane_write(lane, LNaTTLCR0, conf->ttlcr0);
 }
 
 static int lynx_28g_lane_disable_pcvt(struct lynx_28g_lane *lane,
-- 
2.34.1