[Intel-wired-lan] [PATCH v2 iwl-next 09/10] ice: fall back to TCXO on TSPLL lock fail

[Karol Kolacinski]

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 at intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski at intel.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 25a805fa0bdd..b81eb6d2a0de 100644
--- a/drivers/net/ethernet/intel/ice/ice_tspll.c
+++ b/drivers/net/ethernet/intel/ice/ice_tspll.c
@@ -490,5 +490,17 @@ 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;
 }
-- 
2.49.0