ASoC: adau1372: Clear PLL_EN on failed PLL lock without reset GPIO

The PLL lock failure path in adau1372_set_power() unwinds by putting
the regmap back in cache-only mode, asserting the optional power-down
GPIO and disabling mclk.

adau1372_enable_pll() enables CLK_CTRL.PLL_EN before polling the PLL
lock bit. If the lock fails on a board without a power-down GPIO, the
error path disables mclk and returns an error, but leaves PLL_EN set in
the hardware register. The normal power-off path already handles the
no-GPIO case by explicitly clearing PLL_EN.

Mirror that cleanup in the PLL lock failure path and clear PLL_EN while
the regmap is still live, before switching it back to cache-only mode.

Fixes: bfe6a26 ("ASoC: adau1372: Fix clock leak on PLL lock failure")
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Link: https://patch.msgid.link/20260604125520.1428905-1-lgs201920130244@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: lgs2513

sound/soc/codecs/adau1372.c

@@ -813,6 +813,11 @@ static int adau1372_set_power(struct adau1372 *adau1372, bool enable)
 		if (adau1372->use_pll) {
 			ret = adau1372_enable_pll(adau1372);
 			if (ret) {
+				if (!adau1372->pd_gpio)
+					regmap_update_bits(adau1372->regmap,
+							   ADAU1372_REG_CLK_CTRL,
+							   ADAU1372_CLK_CTRL_PLL_EN,
+							   0);
 				regcache_cache_only(adau1372->regmap, true);
 				if (adau1372->pd_gpio)
 					gpiod_set_value(adau1372->pd_gpio, 1);