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forked fromtorvalds/linux

Commite6ce0ce

Browse files
ahunter6rafaeljw
authored andcommitted
ACPI / LPSS: Add device link for CHT SD card dependency on I2C
Some Cherry Trail boards have a dependency between the SDHCI hostcontroller used for SD cards and an external PMIC accessed via I2C. Add adevice link between the SDHCI host controller (consumer) and the I2Cadapter (supplier).This patch depends on a fix to devices links, namely commit0ff26c6("driver core: Fix device link deferred probe"). And also either,commit126dbc6 ("PM: i2c-designware-platdrv: Clean up PM handling inprobe"), or patch "PM / runtime: Fix handling of suppliers with disabledruntime PM".Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent50c4c4e commite6ce0ce

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‎drivers/acpi/acpi_lpss.c‎

Lines changed: 137 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -427,6 +427,142 @@ static int register_device_clock(struct acpi_device *adev,
427427
return0;
428428
}
429429

430+
structlpss_device_links {
431+
constchar*supplier_hid;
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constchar*supplier_uid;
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constchar*consumer_hid;
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constchar*consumer_uid;
435+
u32flags;
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};
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/*
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* The _DEP method is used to identify dependencies but instead of creating
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* device links for every handle in _DEP, only links in the following list are
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* created. That is necessary because, in the general case, _DEP can refer to
442+
* devices that might not have drivers, or that are on different buses, or where
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* the supplier is not enumerated until after the consumer is probed.
444+
*/
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staticconststructlpss_device_linkslpss_device_links[]= {
446+
{"808622C1","7","80860F14","3",DL_FLAG_PM_RUNTIME},
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};
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staticboolhid_uid_match(constchar*hid1,constchar*uid1,
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constchar*hid2,constchar*uid2)
451+
{
452+
return !strcmp(hid1,hid2)&&uid1&&uid2&& !strcmp(uid1,uid2);
453+
}
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staticboolacpi_lpss_is_supplier(structacpi_device*adev,
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conststructlpss_device_links*link)
457+
{
458+
returnhid_uid_match(acpi_device_hid(adev),acpi_device_uid(adev),
459+
link->supplier_hid,link->supplier_uid);
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}
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staticboolacpi_lpss_is_consumer(structacpi_device*adev,
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conststructlpss_device_links*link)
464+
{
465+
returnhid_uid_match(acpi_device_hid(adev),acpi_device_uid(adev),
466+
link->consumer_hid,link->consumer_uid);
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}
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structhid_uid {
470+
constchar*hid;
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constchar*uid;
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};
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staticintmatch_hid_uid(structdevice*dev,void*data)
475+
{
476+
structacpi_device*adev=ACPI_COMPANION(dev);
477+
structhid_uid*id=data;
478+
479+
if (!adev)
480+
return0;
481+
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returnhid_uid_match(acpi_device_hid(adev),acpi_device_uid(adev),
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id->hid,id->uid);
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}
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staticstructdevice*acpi_lpss_find_device(constchar*hid,constchar*uid)
487+
{
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structhid_uiddata= {
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.hid=hid,
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.uid=uid,
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};
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returnbus_find_device(&platform_bus_type,NULL,&data,match_hid_uid);
494+
}
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staticboolacpi_lpss_dep(structacpi_device*adev,acpi_handlehandle)
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{
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structacpi_handle_listdep_devices;
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acpi_statusstatus;
500+
inti;
501+
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if (!acpi_has_method(adev->handle,"_DEP"))
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return false;
504+
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status=acpi_evaluate_reference(adev->handle,"_DEP",NULL,
506+
&dep_devices);
507+
if (ACPI_FAILURE(status)) {
508+
dev_dbg(&adev->dev,"Failed to evaluate _DEP.\n");
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return false;
510+
}
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for (i=0;i<dep_devices.count;i++) {
513+
if (dep_devices.handles[i]==handle)
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return true;
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}
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return false;
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}
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staticvoidacpi_lpss_link_consumer(structdevice*dev1,
521+
conststructlpss_device_links*link)
522+
{
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structdevice*dev2;
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dev2=acpi_lpss_find_device(link->consumer_hid,link->consumer_uid);
526+
if (!dev2)
527+
return;
528+
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if (acpi_lpss_dep(ACPI_COMPANION(dev2),ACPI_HANDLE(dev1)))
530+
device_link_add(dev2,dev1,link->flags);
531+
532+
put_device(dev2);
533+
}
534+
535+
staticvoidacpi_lpss_link_supplier(structdevice*dev1,
536+
conststructlpss_device_links*link)
537+
{
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structdevice*dev2;
539+
540+
dev2=acpi_lpss_find_device(link->supplier_hid,link->supplier_uid);
541+
if (!dev2)
542+
return;
543+
544+
if (acpi_lpss_dep(ACPI_COMPANION(dev1),ACPI_HANDLE(dev2)))
545+
device_link_add(dev1,dev2,link->flags);
546+
547+
put_device(dev2);
548+
}
549+
550+
staticvoidacpi_lpss_create_device_links(structacpi_device*adev,
551+
structplatform_device*pdev)
552+
{
553+
inti;
554+
555+
for (i=0;i<ARRAY_SIZE(lpss_device_links);i++) {
556+
conststructlpss_device_links*link=&lpss_device_links[i];
557+
558+
if (acpi_lpss_is_supplier(adev,link))
559+
acpi_lpss_link_consumer(&pdev->dev,link);
560+
561+
if (acpi_lpss_is_consumer(adev,link))
562+
acpi_lpss_link_supplier(&pdev->dev,link);
563+
}
564+
}
565+
430566
staticintacpi_lpss_create_device(structacpi_device*adev,
431567
conststructacpi_device_id*id)
432568
{
@@ -500,6 +636,7 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
500636
adev->driver_data=pdata;
501637
pdev=acpi_create_platform_device(adev,dev_desc->properties);
502638
if (!IS_ERR_OR_NULL(pdev)) {
639+
acpi_lpss_create_device_links(adev,pdev);
503640
return1;
504641
}
505642

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