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lynxpoint: Do not put SerialIO devices into D3Hot in ACPI mode 

Remove the bit of code that was putting the SerialIO devices into
D3Hot state when they are switched from PCI to ACPI mode.  Instead,
add the appropriate ACPI Methods to allow the kernel to control the
power state of the device.

The problem seems to be that if the device is put in D3Hot state
before it is switched from PCI to ACPI mode then it does not properly
export its PCI configuration space and cannot be woken back up.

Adding the ACPI Methods for _PS0/_PS3 allows the kernel to transition
the device into D0 state only when it is necessary to communicate with
the device, then put it back into D3Hot state.

Change-Id: I2384ba10bf47750d1c1a35216169ddeee26881df
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/5193
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Duncan Laurie 2014-02-11 10:34:06 -08:00 committed by Stefan Reinauer
parent 2161c1d792
commit 6c03160d48
2 changed files with 44 additions and 10 deletions
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44
src/southbridge/intel/lynxpoint/acpi/serialio.asl
View File

@ -211,6 +211,28 @@ Device (I2C0)
Return (0xF)
}
}
// Access to PCI Config in ACPI mode
OperationRegion (KEYS, SystemMemory, \S1B1, 0x100)
Field (KEYS, DWordAcc, NoLock, Preserve)
{
Offset (0x84),
PSAT, 32,
}
// Put controller in D0 state
Method (_PS0, 0, Serialized)
{
And (^PSAT, 0xfffffffc, ^PSAT)
Store (^PSAT, Local0)
}
// Put controller in D3Hot state
Method (_PS3, 0, Serialized)
{
Or (^PSAT, 0x00000003, ^PSAT)
Store (^PSAT, Local0)
}
}
Device (I2C1)
@ -262,6 +284,28 @@ Device (I2C1)
Return (0xF)
}
}
// Access to PCI Config in ACPI mode
OperationRegion (KEYS, SystemMemory, \S2B1, 0x100)
Field (KEYS, DWordAcc, NoLock, Preserve)
{
Offset (0x84),
PSAT, 32,
}
// Put controller in D0 state
Method (_PS0, 0, Serialized)
{
And (^PSAT, 0xfffffffc, ^PSAT)
Store (^PSAT, Local0)
}
// Put controller in D3Hot state
Method (_PS3, 0, Serialized)
{
Or (^PSAT, 0x00000003, ^PSAT)
Store (^PSAT, Local0)
}
}
Device (SPI0)

10
src/southbridge/intel/lynxpoint/serialio.c
View File

@ -29,14 +29,6 @@
#include "pch.h"
#include "nvs.h"
/* Set D3Hot Power State in ACPI mode */
static void serialio_enable_d3hot(struct device *dev)
{
u32 reg32 = pci_read_config32(dev, PCH_PCS);
reg32 |= PCH_PCS_PS_D3HOT;
pci_write_config32(dev, PCH_PCS, reg32);
}
/* Enable clock in PCI mode */
static void serialio_enable_clock(struct resource *bar0)
{
@ -178,8 +170,6 @@ static void serialio_init(struct device *dev)
if (!config->sio_acpi_mode)
serialio_enable_clock(bar0);
else if (dev->path.pci.devfn != PCI_DEVFN(21, 0))
serialio_enable_d3hot(dev); /* all but SDMA */
switch (dev->path.pci.devfn) {
case PCI_DEVFN(21, 0): /* SDMA */