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[v2,7/7] ASoC: cs42l43: Use fls to calculate the pre-divider for the PLL

Message ID 20240125103117.2622095-7-ckeepax@opensource.cirrus.com (mailing list archive)
State Accepted
Commit 31c6e53a4da5fe626b99e1ebf777d751994e3281
Headers show
Series [v2,1/7] ASoC: cs42l43: Tidy up header includes | expand

Commit Message

Charles Keepax Jan. 25, 2024, 10:31 a.m. UTC 
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 <andy.shevchenko@gmail.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---

Changes since v1:
 - Change / into >>

Thanks,
Charles

 sound/soc/codecs/cs42l43.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
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Patch

diff --git a/sound/soc/codecs/cs42l43.c b/sound/soc/codecs/cs42l43.c
index 23e9557494afa..2c402086924d3 100644
--- a/sound/soc/codecs/cs42l43.c
+++ b/sound/soc/codecs/cs42l43.c
@@ -1338,10 +1338,9 @@  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;