mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 10:01:43 +00:00
c2101d0182
Rework the handling of the P-unit semaphore on Intel Baytrail and Cherrytrail systems to avoid race conditions and excessive overhead related to it (Hans de Goede). -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJb2BIsAAoJEILEb/54YlRx/3IP/jhBujlb884Yz1Kzix2cEat0 56fqh1TJTn9ZyOQjTW2rIbRnOdSNHzerLWWoUZdKO9ndO1gRvLgNBILug2zC/9TZ gZ+AODC7JVcAvSk8vVCN7wtHbDFH23dEP5kdye8Ax4MqMFY0ctKMVIvicPD7HXFS nFaB/JZQ9SlWKmaIPQKpyTQ5dCTZM5qnziYiRt56HpEFoCPYdzaaUx7zlVWJff8J N521n3bEgxglOBqJyGkR5LvOZJ7S92KwOL94FNCY0/yEDbY53YWTxXkpFJVbBzlK gELAehxUBD9cnwi+g1OSrTCeOVdsCWwmiztTbpHlcLhCITsHFdg1B6SPlX3Sw4Wv DRszpnazSJfJj87JNRaYBXdgQnDs3wDW5yji3aTbu8MOa8kWMrpDzmR/qs4vYZGT EB37hKk0ZO15dNeIhHmKoo4d3pzDYzSAeJ1d1c2cOG5QMF3qsIfZyHyDQAUaIYMx EkLhZki2PyOFicgTlchr+9mBsXT37KrJXxYIFb4w2BjzZ4u74IEER4QDgRHSFuTL sJgxrqY/+n1142UqFRhgu59yeRKl+seyNHB/RptM1DsVs4BRkHcEj4pfBPq49Kxv 2H0ByTAvy09olcFvFqSVCFzPEquNsLJrvhrTiwbduOsBcVHwXIWNywaBwjeYllPX iNIWx7Nr/TzlV4hPO8pH =4oYh -----END PGP SIGNATURE----- Merge tag 'acpi-4.20-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull more ACPI updates from Rafael Wysocki: "Rework the handling of the P-unit semaphore on Intel Baytrail and Cherrytrail systems to avoid race conditions and excessive overhead related to it (Hans de Goede)" * tag 'acpi-4.20-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI / PMIC: xpower: Add depends on IOSF_MBI to Kconfig entry i2c: designware: Cleanup bus lock handling ACPI / PMIC: xpower: Block P-Unit I2C access during read-modify-write x86: baytrail/cherrytrail: Rework and move P-Unit PMIC bus semaphore code
45 lines
938 B
C
45 lines
938 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Intel BayTrail PMIC I2C bus semaphore implementaion
|
|
* Copyright (c) 2014, Intel Corporation.
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/iosf_mbi.h>
|
|
|
|
#include "i2c-designware-core.h"
|
|
|
|
int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
|
|
{
|
|
acpi_status status;
|
|
unsigned long long shared_host = 0;
|
|
acpi_handle handle;
|
|
|
|
if (!dev || !dev->dev)
|
|
return 0;
|
|
|
|
handle = ACPI_HANDLE(dev->dev);
|
|
if (!handle)
|
|
return 0;
|
|
|
|
status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
|
|
if (ACPI_FAILURE(status))
|
|
return 0;
|
|
|
|
if (!shared_host)
|
|
return 0;
|
|
|
|
if (!iosf_mbi_available())
|
|
return -EPROBE_DEFER;
|
|
|
|
dev_info(dev->dev, "I2C bus managed by PUNIT\n");
|
|
dev->acquire_lock = iosf_mbi_block_punit_i2c_access;
|
|
dev->release_lock = iosf_mbi_unblock_punit_i2c_access;
|
|
dev->shared_with_punit = true;
|
|
|
|
return 0;
|
|
}
|