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i2c: designware: Never suspend i2c-busses used for accessing the system PMIC

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Currently we are already setting a pm_runtime_disabled flag and disabling
runtime-pm for i2c-busses used for accessing the system PMIC on x86.
But this is not enough, there are ACPI opregions which may want to access
the PMIC during late-suspend and early-resume, so we need to completely
disable pm to be safe.

This commit renames the flag from pm_runtime_disabled to pm_disabled and
adds the following new behavior if the flag is set:

1) Call dev_pm_syscore_device(dev, true) which disables normal suspend /
   resume and remove the pm_runtime_disabled check from dw_i2c_plat_resume
   since that will now never get called. This fixes suspend_late handlers
   which use ACPI PMIC opregions causing errors like these:

  PM: Suspending system (freeze)
  PM: suspend of devices complete after 1127.751 msecs
  i2c_designware 808622C1:06: timeout waiting for bus ready
  ACPI Exception: AE_ERROR, Returned by Handler for [UserDefinedRegion]
  acpi 80860F14:02: Failed to change power state to D3hot
  PM: late suspend of devices failed

2) Set IRQF_NO_SUSPEND irq flag. This fixes resume_early handlers which
   handlers which use ACPI PMIC opregions causing errors like these:

  PM: resume from suspend-to-idle
  i2c_designware 808622C1:06: controller timed out
  ACPI Exception: AE_ERROR, Returned by Handler for [UserDefinedRegion]

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Hans de Goede 2017-03-13 23:25:09 +01:00 committed by Wolfram Sang
parent 78c43af2c1
commit 41c80b8a63
4 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/i2c/busses/i2c-designware-baytrail.c
View File

@ -170,7 +170,7 @@ int i2c_dw_probe_lock_support(struct dw_i2c_dev *dev)
dev_info(dev->dev, "I2C bus managed by PUNIT\n");
dev->acquire_lock = baytrail_i2c_acquire;
dev->release_lock = baytrail_i2c_release;
dev->pm_runtime_disabled = true;
dev->pm_disabled = true;
pm_qos_add_request(&dev->pm_qos, PM_QOS_CPU_DMA_LATENCY,
PM_QOS_DEFAULT_VALUE);

11
drivers/i2c/busses/i2c-designware-core.c
View File

@ -960,6 +960,7 @@ EXPORT_SYMBOL_GPL(i2c_dw_read_comp_param);
int i2c_dw_probe(struct dw_i2c_dev *dev)
{
struct i2c_adapter *adap = &dev->adapter;
unsigned long irq_flags;
int r;
init_completion(&dev->cmd_complete);
@ -975,9 +976,15 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
adap->dev.parent = dev->dev;
i2c_set_adapdata(adap, dev);
if (dev->pm_disabled) {
dev_pm_syscore_device(dev->dev, true);
irq_flags = IRQF_NO_SUSPEND;
} else {
irq_flags = IRQF_SHARED | IRQF_COND_SUSPEND;
}
i2c_dw_disable_int(dev);
r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
IRQF_SHARED | IRQF_COND_SUSPEND,
r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
dev_name(dev->dev), dev);
if (r) {
dev_err(dev->dev, "failure requesting irq %i: %d\n",

4
drivers/i2c/busses/i2c-designware-core.h
View File

@ -79,7 +79,7 @@
* @pm_qos: pm_qos_request used while holding a hardware lock on the bus
* @acquire_lock: function to acquire a hardware lock on the bus
* @release_lock: function to release a hardware lock on the bus
* @pm_runtime_disabled: true if pm runtime is disabled
* @pm_disabled: true if power-management should be disabled for this i2c-bus
*
* HCNT and LCNT parameters can be used if the platform knows more accurate
* values than the one computed based only on the input clock frequency.
@ -128,7 +128,7 @@ struct dw_i2c_dev {
struct pm_qos_request pm_qos;
int (*acquire_lock)(struct dw_i2c_dev *dev);
void (*release_lock)(struct dw_i2c_dev *dev);
bool pm_runtime_disabled;
bool pm_disabled;
};
#define ACCESS_SWAP 0x00000001

10
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -286,7 +286,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
adap->dev.of_node = pdev->dev.of_node;
if (dev->pm_runtime_disabled) {
if (dev->pm_disabled) {
pm_runtime_forbid(&pdev->dev);
} else {
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
@ -302,7 +302,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
return r;
exit_probe:
if (!dev->pm_runtime_disabled)
if (!dev->pm_disabled)
pm_runtime_disable(&pdev->dev);
exit_reset:
if (!IS_ERR_OR_NULL(dev->rst))
@ -322,7 +322,7 @@ static int dw_i2c_plat_remove(struct platform_device *pdev)
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
if (!dev->pm_runtime_disabled)
if (!dev->pm_disabled)
pm_runtime_disable(&pdev->dev);
if (!IS_ERR_OR_NULL(dev->rst))
reset_control_assert(dev->rst);
@ -374,9 +374,7 @@ static int dw_i2c_plat_resume(struct device *dev)
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
i2c_dw_plat_prepare_clk(i_dev, true);
if (!i_dev->pm_runtime_disabled)
i2c_dw_init(i_dev);
i2c_dw_init(i_dev);
return 0;
}