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c50cdd62dd
Default I2C device properties for Intel Broxton, especially SDA hold time may not be enough on Intel Apollo Lake. These properties are used in case we don't get timing parameters from ACPI. The default SDA hold time for Broxton may fail with arbitration lost errors on Apollo Lake: i2c_designware i2c_designware.1: i2c_dw_handle_tx_abort: lost arbitration Fix this by using different default device properties on Apollo Lake than Broxton. Reported-by: Paul Liu <paul.liu@canonical.com> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=156181 Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* Intel LPSS ACPI support.
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*
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* Copyright (C) 2015, Intel Corporation
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*
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* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include "intel-lpss.h"
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static const struct intel_lpss_platform_info spt_info = {
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.clk_rate = 120000000,
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};
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static struct property_entry spt_i2c_properties[] = {
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PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
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{ },
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};
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static const struct intel_lpss_platform_info spt_i2c_info = {
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.clk_rate = 120000000,
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.properties = spt_i2c_properties,
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};
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static const struct intel_lpss_platform_info bxt_info = {
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.clk_rate = 100000000,
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};
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static struct property_entry bxt_i2c_properties[] = {
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PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42),
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PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
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PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
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{ },
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};
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static const struct intel_lpss_platform_info bxt_i2c_info = {
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.clk_rate = 133000000,
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.properties = bxt_i2c_properties,
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};
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static struct property_entry apl_i2c_properties[] = {
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PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
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PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
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PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
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{ },
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};
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static const struct intel_lpss_platform_info apl_i2c_info = {
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.clk_rate = 133000000,
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.properties = apl_i2c_properties,
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};
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static const struct acpi_device_id intel_lpss_acpi_ids[] = {
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/* SPT */
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{ "INT3446", (kernel_ulong_t)&spt_i2c_info },
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{ "INT3447", (kernel_ulong_t)&spt_i2c_info },
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/* BXT */
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{ "80860AAC", (kernel_ulong_t)&bxt_i2c_info },
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{ "80860ABC", (kernel_ulong_t)&bxt_info },
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{ "80860AC2", (kernel_ulong_t)&bxt_info },
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/* APL */
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{ "80865AAC", (kernel_ulong_t)&apl_i2c_info },
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{ "80865ABC", (kernel_ulong_t)&bxt_info },
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{ "80865AC2", (kernel_ulong_t)&bxt_info },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
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static int intel_lpss_acpi_probe(struct platform_device *pdev)
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{
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struct intel_lpss_platform_info *info;
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const struct acpi_device_id *id;
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id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
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if (!id)
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return -ENODEV;
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info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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info->irq = platform_get_irq(pdev, 0);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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return intel_lpss_probe(&pdev->dev, info);
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}
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static int intel_lpss_acpi_remove(struct platform_device *pdev)
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{
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intel_lpss_remove(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
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static struct platform_driver intel_lpss_acpi_driver = {
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.probe = intel_lpss_acpi_probe,
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.remove = intel_lpss_acpi_remove,
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.driver = {
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.name = "intel-lpss",
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.acpi_match_table = intel_lpss_acpi_ids,
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.pm = &intel_lpss_acpi_pm_ops,
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},
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};
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module_platform_driver(intel_lpss_acpi_driver);
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MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
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MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
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MODULE_DESCRIPTION("Intel LPSS ACPI driver");
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MODULE_LICENSE("GPL v2");
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