1 files changed, 98 insertions, 0 deletions
diff --git a/sound/soc/intel/common/soc-intel-quirks.h b/sound/soc/intel/common/soc-intel-quirks.h
new file mode 100644
index 0000000000..de4e550c5b
--- /dev/null
+++ b/sound/soc/intel/common/soc-intel-quirks.h
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * soc-intel-quirks.h - prototypes for quirk autodetection
+ *
+ * Copyright (c) 2019, Intel Corporation.
+ *
+ */
+
+#ifndef _SND_SOC_INTEL_QUIRKS_H
+#define _SND_SOC_INTEL_QUIRKS_H
+
+#include <linux/platform_data/x86/soc.h>
+
+#if IS_ENABLED(CONFIG_X86)
+
+#include <linux/dmi.h>
+#include <asm/iosf_mbi.h>
+
+static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
+{
+	/*
+	 * List of systems which:
+	 * 1. Use a non CR version of the Bay Trail SoC
+	 * 2. Contain at least 6 interrupt resources so that the
+	 *    platform_get_resource(pdev, IORESOURCE_IRQ, 5) check below
+	 *    succeeds
+	 * 3. Despite 1. and 2. still have their IPC IRQ at index 0 rather then 5
+	 *
+	 * This needs to be here so that it can be shared between the SST and
+	 * SOF drivers. We rely on the compiler to optimize this out in files
+	 * where soc_intel_is_byt_cr is not used.
+	 */
+	static const struct dmi_system_id force_bytcr_table[] = {
+		{	/* Lenovo Yoga Tablet 2 series */
+			.matches = {
+				DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+				DMI_MATCH(DMI_PRODUCT_FAMILY, "YOGATablet2"),
+			},
+		},
+		{}
+	};
+	struct device *dev = &pdev->dev;
+	int status = 0;
+
+	if (!soc_intel_is_byt())
+		return false;
+
+	if (dmi_check_system(force_bytcr_table))
+		return true;
+
+	if (iosf_mbi_available()) {
+		u32 bios_status;
+
+		status = iosf_mbi_read(BT_MBI_UNIT_PMC, /* 0x04 PUNIT */
+				       MBI_REG_READ, /* 0x10 */
+				       0x006, /* BIOS_CONFIG */
+				       &bios_status);
+
+		if (status) {
+			dev_err(dev, "could not read PUNIT BIOS_CONFIG\n");
+		} else {
+			/* bits 26:27 mirror PMIC options */
+			bios_status = (bios_status >> 26) & 3;
+
+			if (bios_status == 1 || bios_status == 3) {
+				dev_info(dev, "Detected Baytrail-CR platform\n");
+				return true;
+			}
+
+			dev_info(dev, "BYT-CR not detected\n");
+		}
+	} else {
+		dev_info(dev, "IOSF_MBI not available, no BYT-CR detection\n");
+	}
+
+	if (!platform_get_resource(pdev, IORESOURCE_IRQ, 5)) {
+		/*
+		 * Some devices detected as BYT-T have only a single IRQ listed,
+		 * causing platform_get_irq with index 5 to return -ENXIO.
+		 * The correct IRQ in this case is at index 0, as on BYT-CR.
+		 */
+		dev_info(dev, "Falling back to Baytrail-CR platform\n");
+		return true;
+	}
+
+	return false;
+}
+
+#else
+
+static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
+{
+	return false;
+}
+
+#endif
+
+#endif /* _SND_SOC_INTEL_QUIRKS_H */