UPSTREAM: ASoC: cs42l43: Use fls to calculate the pre-divider for the…

… PLL

Use fls to calculate the pre-divider and input frequency for the PLL,
this is marginally faster than the previous loop.

Suggested-by: Andy Shevchenko <[email protected]>
Signed-off-by: Charles Keepax <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
(cherry picked from commit 31c6e53a4da5fe626b99e1ebf777d751994e3281)

BUG=b:326869955
TEST=Test Audio use cases.

Change-Id: I59d02dc969f9b43f6958aa9318e4db2bf628abff
Signed-off-by: Debi sahoo <[email protected]>

sound/soc/codecs/cs42l43.c

@@ -1339,10 +1339,9 @@ static int cs42l43_enable_pll(struct cs42l43_codec *priv)
 
 	dev_dbg(priv->dev, "Enabling PLL at %uHz\n", freq);
 
-	while (freq > cs42l43_pll_configs[ARRAY_SIZE(cs42l43_pll_configs) - 1].freq) {
-		div++;
-		freq /= 2;
-	}
+	div = fls(freq) -
+	      fls(cs42l43_pll_configs[ARRAY_SIZE(cs42l43_pll_configs) - 1].freq);
+	freq >>= div;
 
 	if (div <= CS42L43_PLL_REFCLK_DIV_MASK) {
 		int i;