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ASoC: Intel: cht_bsw_rt5645: harden ACPI device detection 

Fix classic issue of having multiple codecs listed in DSDT
but a single one actually enabled. The previous code did
not handle such errors and could also lead to uninitalized
configurations

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2017-01-26 14:09:41 -06:00 committed by Mark Brown
parent e1d0691454
commit 42648c2270
1 changed files with 12 additions and 2 deletions
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14
sound/soc/intel/boards/cht_bsw_rt5645.c
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@ -407,22 +407,32 @@ static int snd_cht_mc_probe(struct platform_device *pdev)
struct sst_acpi_mach *mach;
const char *i2c_name = NULL;
int dai_index = 0;
bool found = false;
drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_ATOMIC);
if (!drv)
return -ENOMEM;
mach = (&pdev->dev)->platform_data;
for (i = 0; i < ARRAY_SIZE(snd_soc_cards); i++) {
if (acpi_dev_found(snd_soc_cards[i].codec_id)) {
if (acpi_dev_found(snd_soc_cards[i].codec_id) &&
(!strncmp(snd_soc_cards[i].codec_id, mach->id, 8))) {
dev_dbg(&pdev->dev,
"found codec %s\n", snd_soc_cards[i].codec_id);
card = snd_soc_cards[i].soc_card;
drv->acpi_card = &snd_soc_cards[i];
found = true;
break;
}
}
if (!found) {
dev_err(&pdev->dev, "No matching HID found in supported list\n");
return -ENODEV;
}
card->dev = &pdev->dev;
mach = card->dev->platform_data;
sprintf(drv->codec_name, "i2c-%s:00", drv->acpi_card->codec_id);
/* set correct codec name */