ASoC: stm32: sai: manage context in set_sysclk callback

The mclk direction now needs to be specified in endpoint node with
"system-clock-direction-out" property. However some calls to the
set_sysclk callback, related to CPU DAI clock, result in unbalanced
calls to clock API.
The set_sysclk callback in STM32 SAI driver is intended only for mclk
management. So it is relevant to ensure that calls to set_sysclk are
related to mclk only.
Since the master clock is handled only at runtime, skip the calls to
set_sysclk in the initialization phase.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20250916123118.84175-1-olivier.moysan@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 463a2b7d023b9cae802f88041c23a9bcc3219a6a..0ae1eae2a59e2fd612946f15b5d8bd269bf95edc 100644 (file)
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -672,6 +672,14 @@ static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
        struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
        int ret;
 
+       /*
+        * The mclk rate is determined at runtime from the audio stream rate.
+        * Skip calls to the set_sysclk callback that are not relevant during the
+        * initialization phase.
+        */
+       if (!snd_soc_card_is_instantiated(cpu_dai->component->card))
+               return 0;
+
        if (dir == SND_SOC_CLOCK_OUT && sai->sai_mclk) {
                ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX,
                                           SAI_XCR1_NODIV,