[PATCH 07/13] clk: qcom: clk-alpha-pll: Add support to skip PLL configuration

[Jagadeesh Kona]

Some PLLs are already configured as part of CRM(CESTA Resource
manager) initialization. Add support to skip PLL reconfiguration
for such PLLs that are already configured.

Signed-off-by: Jagadeesh Kona <jagadeesh.kona@xxxxxxxxxxxxxxxx>
---
 drivers/clk/qcom/clk-alpha-pll.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 67fc97739d0d4c26aec0bac5d43d1b87d297bc6a..2f4ebf4d3884b92c981dbe0e67245704a88881ad 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2332,7 +2332,7 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_zonda_ops);
 void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
 				 const struct alpha_pll_config *config)
 {
-	u32 lval = config->l;
+	u32 lval = config->l, regval;
 
 	/*
 	 * If the bootloader left the PLL enabled it's likely that there are
@@ -2343,6 +2343,12 @@ void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regma
 		return;
 	}
 
+	/* Return early if PLL is already configured */
+	regmap_read(regmap, PLL_L_VAL(pll), &regval);
+	regval &= LUCID_EVO_PLL_L_VAL_MASK;
+	if (regval)
+		return;
+
 	if (config->cal_l)
 		lval |= config->cal_l << LUCID_EVO_PLL_CAL_L_VAL_SHIFT;
 	else

-- 
2.34.1