From d1c808765deb2bcd35d827402ed4d75d068aae18 Mon Sep 17 00:00:00 2001
From: Brent Lu <brent.lu@intel.com>
Date: Mon, 9 May 2022 12:09:21 -0500
Subject: [PATCH] ASoC: Intel: sof_ssp_amp: fix no DMIC BE Link on Chromebooks
Git-commit: d1c808765deb2bcd35d827402ed4d75d068aae18
Patch-mainline: v5.19-rc1
References: jsc#PED-850

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/intel/boards/sof_ssp_amp.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/sound/soc/intel/boards/sof_ssp_amp.c b/sound/soc/intel/boards/sof_ssp_amp.c
index 8f5b9ebbe828..675ade8187b6 100644
--- 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;
 
-- 
2.35.3