[PATCH 3/3] ASoC: fsl_sai: add error message in case of missing imx-pcm-dma support

[Marco Felsch]

If the imx-pcm-dma is required we need to have the module enabled. For
all NXP/FSL sound cards using the ASoC architecture this is the case but
in case of using the simple-audio-card sound card this isn't the case.

In such case the driver probe fails silently and the card isn't
available. It took a while to find the missing Kconfig. Make this easier
for others by printing a error if this the module isn't available but
required by the HW.

Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
---
 sound/soc/fsl/fsl_sai.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 3e54f1f71c1e..2371da814b09 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -1152,8 +1152,11 @@ static int fsl_sai_probe(struct platform_device *pdev)
 	 */
 	if (sai->soc_data->use_imx_pcm) {
 		ret = imx_pcm_dma_init(pdev);
-		if (ret)
+		if (ret) {
+			if (!IS_ENABLED(CONFIG_SND_SOC_IMX_PCM_DMA))
+				dev_err(dev, "Error: You must enable the imx-pcm-dma support!\n");
 			goto err_pm_get_sync;
+		}
 	} else {
 		ret = devm_snd_dmaengine_pcm_register(dev, NULL, 0);
 		if (ret)
-- 
2.30.2