clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override for LUCID EVO PLL

In LUCID EVO PLL CAL_L_VAL and L_VAL bitfields are part of single
PLL_L_VAL register. Update for L_VAL bitfield values in PLL_L_VAL
register using regmap_write() API in __alpha_pll_trion_set_rate
callback will override LUCID EVO PLL initial configuration related
to PLL_CAL_L_VAL bit fields in PLL_L_VAL register.

Observed random PLL lock failures during PLL enable due to such
override in PLL calibration value. Use regmap_update_bits() with
L_VAL bitfield mask instead of regmap_write() API to update only
PLL_L_VAL bitfields in __alpha_pll_trion_set_rate callback.

Fixes: 260e366 ("clk: qcom: clk-alpha-pll: add Lucid EVO PLL configuration interfaces")
Cc: [email protected]
Signed-off-by: Ajit Pandey <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Acked-by: Vladimir Zapolskiy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: Ajit Pandey

drivers/clk/qcom/clk-alpha-pll.c

@@ -1712,7 +1712,7 @@ static int __alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
 	if (ret < 0)
 		return ret;
 
-	regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
+	regmap_update_bits(pll->clkr.regmap, PLL_L_VAL(pll), LUCID_EVO_PLL_L_VAL_MASK,  l);
 	regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
 
 	/* Latch the PLL input */