netdev - [PATCH net-next 13/15] ice: fall back to TCXO on TSPLL lock fail

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Message-ID: <20250618174231.3100231-14-anthony.l.nguyen@intel.com>
Date: Wed, 18 Jun 2025 10:42:25 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Karol Kolacinski <karol.kolacinski@...el.com>,
	anthony.l.nguyen@...el.com,
	jacob.e.keller@...el.com,
	przemyslaw.kitszel@...el.com,
	richardcochran@...il.com,
	Milena Olech <milena.olech@...el.com>,
	Rinitha S <sx.rinitha@...el.com>
Subject: [PATCH net-next 13/15] ice: fall back to TCXO on TSPLL lock fail

From: Karol Kolacinski <karol.kolacinski@...el.com>

TSPLL can fail when trying to lock to TIME_REF as a clock source, e.g.
when the external clock source is not stable or connected to the board.
To continue operation after failure, try to lock again to internal TCXO
and inform user about this.

Reviewed-by: Milena Olech <milena.olech@...el.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
Tested-by: Rinitha S <sx.rinitha@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_tspll.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_tspll.c b/drivers/net/ethernet/intel/ice/ice_tspll.c
index a392b39920ae..7b61e1afe8b4 100644
--- a/drivers/net/ethernet/intel/ice/ice_tspll.c
+++ b/drivers/net/ethernet/intel/ice/ice_tspll.c
@@ -497,5 +497,17 @@ int ice_tspll_init(struct ice_hw *hw)
 	/* Configure the TSPLL using the parameters from the function
 	 * capabilities.
 	 */
-	return ice_tspll_cfg(hw, tspll_freq, clk_src);
+	err = ice_tspll_cfg(hw, tspll_freq, clk_src);
+	if (err) {
+		dev_warn(ice_hw_to_dev(hw), "Failed to lock TSPLL to predefined frequency. Retrying with fallback frequency.\n");
+
+		/* Try to lock to internal TCXO as a fallback. */
+		tspll_freq = ice_tspll_default_freq(hw->mac_type);
+		clk_src = ICE_CLK_SRC_TCXO;
+		err = ice_tspll_cfg(hw, tspll_freq, clk_src);
+		if (err)
+			dev_warn(ice_hw_to_dev(hw), "Failed to lock TSPLL to fallback frequency.\n");
+	}
+
+	return err;
 }
-- 
2.47.1