ASoC: Intel: sof_ssp_amp: fix no DMIC BE Link on Chromebooks

The SOF topology supports 2 BE Links(dmic01 and dmic16k) and each
link supports up to four DMICs. However, Chromebook does not implement
ACPI NHLT table so the mach->mach_params.dmic_num is always zero. We
add a quirk so machine driver knows it's running on a Chromebook and
need to create BE Links for DMIC.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220509170922.54868-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/boards/sof_ssp_amp.c b/sound/soc/intel/boards/sof_ssp_amp.c
index 8f5b9eb..675ade8 100644 (file)
--- a/sound/soc/intel/boards/sof_ssp_amp.c
+++ b/sound/soc/intel/boards/sof_ssp_amp.c
@@ -9,6 +9,7 @@
 
 #include <linux/acpi.h>
 #include <linux/delay.h>
+#include <linux/dmi.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <sound/core.h>
@@ -78,6 +79,16 @@ struct sof_card_private {
        bool idisp_codec;
 };
 
+static const struct dmi_system_id chromebook_platforms[] = {
+       {
+               .ident = "Google Chromebooks",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "Google"),
+               }
+       },
+       {},
+};
+
 static const struct snd_soc_dapm_widget sof_ssp_amp_dapm_widgets[] = {
        SND_SOC_DAPM_MIC("SoC DMIC", NULL),
 };
@@ -371,7 +382,7 @@ static int sof_ssp_amp_probe(struct platform_device *pdev)
        struct snd_soc_dai_link *dai_links;
        struct snd_soc_acpi_mach *mach;
        struct sof_card_private *ctx;
-       int dmic_be_num, hdmi_num = 0;
+       int dmic_be_num = 0, hdmi_num = 0;
        int ret, ssp_codec;
 
        ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
@@ -383,7 +394,8 @@ static int sof_ssp_amp_probe(struct platform_device *pdev)
 
        mach = pdev->dev.platform_data;
 
-       dmic_be_num = mach->mach_params.dmic_num;
+       if (dmi_check_system(chromebook_platforms) || mach->mach_params.dmic_num > 0)
+               dmic_be_num = 2;
 
        ssp_codec = sof_ssp_amp_quirk & SOF_AMPLIFIER_SSP_MASK;