linux_dsm_epyc7002/arch/arm/mach-imx/cpuidle-imx6q.c
Linus Torvalds 24e44913aa ARM: SoC platform updates
SoC platform changes. Main theme this merge window:
 
  - The Netx platform (Netx 100/500) platform is removed by Linus Walleij--
    the SoC doesn't have active maintainers with hardware, and in
    discussions with the vendor the agreement was that it's OK to remove.
 
  - Russell King has a series of patches that cleans up and refactors
    SA1101 and RiscPC support.
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Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC platform updates from Olof Johansson:
 "SoC platform changes. Main theme this merge window:

   - The Netx platform (Netx 100/500) platform is removed by Linus
     Walleij-- the SoC doesn't have active maintainers with hardware,
     and in discussions with the vendor the agreement was that it's OK
     to remove.

   - Russell King has a series of patches that cleans up and refactors
     SA1101 and RiscPC support"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (47 commits)
  ARM: stm32: use "depends on" instead of "if" after prompt
  ARM: sa1100: convert to common clock framework
  ARM: exynos: Cleanup cppcheck shifting warning
  ARM: pxa/lubbock: remove lubbock_set_misc_wr() from global view
  ARM: exynos: Only build MCPM support if used
  arm: add missing include platform-data/atmel.h
  ARM: davinci: Use GPIO lookup table for DA850 LEDs
  ARM: OMAP2: drop explicit assembler architecture
  ARM: use arch_extension directive instead of arch argument
  ARM: imx: Switch imx7d to imx-cpufreq-dt for speed-grading
  ARM: bcm: Enable PINCTRL for ARCH_BRCMSTB
  ARM: bcm: Enable ARCH_HAS_RESET_CONTROLLER for ARCH_BRCMSTB
  ARM: riscpc: enable chained scatterlist support
  ARM: riscpc: reduce IRQ handling code
  ARM: riscpc: move RiscPC assembly files from arch/arm/lib to mach-rpc
  ARM: riscpc: parse video information from tagged list
  ARM: riscpc: add ecard quirk for Atomwide 3port serial card
  MAINTAINERS: mvebu: Add git entry
  soc: ti: pm33xx: Add a print while entering RTC only mode with DDR in self-refresh
  ARM: OMAP2+: Make some variables static
  ...
2019-07-19 17:05:08 -07:00

82 lines
1.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*/
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <asm/cpuidle.h>
#include <soc/imx/cpuidle.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
static int num_idle_cpus = 0;
static DEFINE_RAW_SPINLOCK(cpuidle_lock);
static int imx6q_enter_wait(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
raw_spin_lock(&cpuidle_lock);
if (++num_idle_cpus == num_online_cpus())
imx6_set_lpm(WAIT_UNCLOCKED);
raw_spin_unlock(&cpuidle_lock);
cpu_do_idle();
raw_spin_lock(&cpuidle_lock);
if (num_idle_cpus-- == num_online_cpus())
imx6_set_lpm(WAIT_CLOCKED);
raw_spin_unlock(&cpuidle_lock);
return index;
}
static struct cpuidle_driver imx6q_cpuidle_driver = {
.name = "imx6q_cpuidle",
.owner = THIS_MODULE,
.states = {
/* WFI */
ARM_CPUIDLE_WFI_STATE,
/* WAIT */
{
.exit_latency = 50,
.target_residency = 75,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.enter = imx6q_enter_wait,
.name = "WAIT",
.desc = "Clock off",
},
},
.state_count = 2,
.safe_state_index = 0,
};
/*
* i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
* CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
* applicable to all boards, disable the deeper idle state when the workaround
* isn't present and the FEC is in use.
*/
void imx6q_cpuidle_fec_irqs_used(void)
{
imx6q_cpuidle_driver.states[1].disabled = true;
}
EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
void imx6q_cpuidle_fec_irqs_unused(void)
{
imx6q_cpuidle_driver.states[1].disabled = false;
}
EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused);
int __init imx6q_cpuidle_init(void)
{
/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
imx6_set_int_mem_clk_lpm(true);
return cpuidle_register(&imx6q_cpuidle_driver, NULL);
}