ASoC: samsung: get access to DMA engine early to defer probe properly

ASoC Samsung sub-drivers tried to get access to their DMA engine
controllers as a last step in driver probe. If a DMA engine was not
available yet, samsung_asoc_dma_platform_register() function ended in
-EPROBE_DEFER, but the driver already registered its component to ASoC
core. This patch moves samsung_asoc_dma_platform_register() call before
registering any components, to the common place, where driver was gathering
all needed resources.

In case of Samsung Exynos i2s driver the issue was even worse. The driver
managed already to register its secondary DAI platform device before
even getting the DMA engine access. That together with -EPROBE_DEFER error
code from samsung_i2s_probe() immediately triggered another round of
deferred probe retry and in turn endless loop of driver probing.

This patch fixes broken boot on Odroid XU3 and other Exynos5422-based
boards.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 8 insertions, 8 deletions

diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c
index 3e89fbc0c51d..0a4718207e6e 100644
--- a/sound/soc/samsung/s3c2412-i2s.c
+++ b/sound/soc/samsung/s3c2412-i2s.c
@@ -168,19 +168,19 @@ static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 	s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
 	s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
 
-	ret = s3c_i2sv2_register_component(&pdev->dev, -1,
-					   &s3c2412_i2s_component,
-					   &s3c2412_i2s_dai);
+	ret = samsung_asoc_dma_platform_register(&pdev->dev,
+						 pdata->dma_filter,
+						 NULL, NULL);
 	if (ret) {
-		pr_err("failed to register the dai\n");
+		pr_err("failed to register the DMA: %d\n", ret);
 		return ret;
 	}
 
-	ret = samsung_asoc_dma_platform_register(&pdev->dev,
-						 pdata->dma_filter,
-						 NULL, NULL);
+	ret = s3c_i2sv2_register_component(&pdev->dev, -1,
+					   &s3c2412_i2s_component,
+					   &s3c2412_i2s_dai);
 	if (ret)
-		pr_err("failed to register the DMA: %d\n", ret);
+		pr_err("failed to register the dai\n");
 
 	return ret;
 }