LXR linux/sound/soc/intel/common/soc-intel-quirks.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * soc-intel-quirks.h - prototypes for quirk autodetection
   4 *
   5 * Copyright (c) 2019, Intel Corporation.
   6 *
   7 */
   8
   9#ifndef _SND_SOC_INTEL_QUIRKS_H
  10#define _SND_SOC_INTEL_QUIRKS_H
  11
  12#include <linux/platform_data/x86/soc.h>
  13
  14#if IS_ENABLED(CONFIG_X86)
  15
  16#include <linux/dmi.h>
  17#include <asm/iosf_mbi.h>
  18
  19static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
  20{
  21        /*
  22         * List of systems which:
  23         * 1. Use a non CR version of the Bay Trail SoC
  24         * 2. Contain at least 6 interrupt resources so that the
  25         *    platform_get_resource(pdev, IORESOURCE_IRQ, 5) check below
  26         *    succeeds
  27         * 3. Despite 1. and 2. still have their IPC IRQ at index 0 rather then 5
  28         *
  29         * This needs to be here so that it can be shared between the SST and
  30         * SOF drivers. We rely on the compiler to optimize this out in files
  31         * where soc_intel_is_byt_cr is not used.
  32         */
  33        static const struct dmi_system_id force_bytcr_table[] = {
  34                {       /* Lenovo Yoga Tablet 2 series */
  35                        .matches = {
  36                                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  37                                DMI_MATCH(DMI_PRODUCT_FAMILY, "YOGATablet2"),
  38                        },
  39                },
  40                {}
  41        };
  42        struct device *dev = &pdev->dev;
  43        int status = 0;
  44
  45        if (!soc_intel_is_byt())
  46                return false;
  47
  48        if (dmi_check_system(force_bytcr_table))
  49                return true;
  50
  51        if (iosf_mbi_available()) {
  52                u32 bios_status;
  53
  54                status = iosf_mbi_read(BT_MBI_UNIT_PMC, /* 0x04 PUNIT */
  55                                       MBI_REG_READ, /* 0x10 */
  56                                       0x006, /* BIOS_CONFIG */
  57                                       &bios_status);
  58
  59                if (status) {
  60                        dev_err(dev, "could not read PUNIT BIOS_CONFIG\n");
  61                } else {
  62                        /* bits 26:27 mirror PMIC options */
  63                        bios_status = (bios_status >> 26) & 3;
  64
  65                        if (bios_status == 1 || bios_status == 3) {
  66                                dev_info(dev, "Detected Baytrail-CR platform\n");
  67                                return true;
  68                        }
  69
  70                        dev_info(dev, "BYT-CR not detected\n");
  71                }
  72        } else {
  73                dev_info(dev, "IOSF_MBI not available, no BYT-CR detection\n");
  74        }
  75
  76        if (!platform_get_resource(pdev, IORESOURCE_IRQ, 5)) {
  77                /*
  78                 * Some devices detected as BYT-T have only a single IRQ listed,
  79                 * causing platform_get_irq with index 5 to return -ENXIO.
  80                 * The correct IRQ in this case is at index 0, as on BYT-CR.
  81                 */
  82                dev_info(dev, "Falling back to Baytrail-CR platform\n");
  83                return true;
  84        }
  85
  86        return false;
  87}
  88
  89#else
  90
  91static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
  92{
  93        return false;
  94}
  95
  96#endif
  97
  98#endif /* _SND_SOC_INTEL_QUIRKS_H */
  99