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baytrail: HDA function disable workaround

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Parts of the audio path are common between the HDA and LPE.
However, those parts are power-controlled by the D-state of
the HDA device. Therefore, one cannot put the HDA into D3Hot
because those audio paths will be shutdown.

BUG=chrome-os-partner:22871
BRANCH=None
TEST=Built and booted through depthcharge. Disabling HDA still
     causes a shutdown when performing warm reset, however I
     was able to verify the magic sequence was being performed.

Change-Id: I3b01356d85a4b7b902bd896b8eb9e7bc509fcc42
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175491
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Aaron Durbin 2013-10-30 17:07:46 -05:00 • committed by chrome-internal-fetch
commit d8cc529c5a
2 changed files with 28 additions and 0 deletions
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1
src/soc/intel/baytrail/baytrail/iomap.h
View file

@ -31,6 +31,7 @@
#define PUNIT_BASE_ADDRESS 0xfed05000
#define RCBA_BASE_ADDRESS 0xfed1c000
#define HPET_BASE_ADDRESS 0xfed00000
#define TEMP_BASE_ADDRESS 0xfd000000
/* IO Port base */
#define ACPI_BASE_ADDRESS 0x0400

27
src/soc/intel/baytrail/southcluster.c
View file

@ -217,10 +217,37 @@ static inline void set_d3hot_bits(device_t dev, int offset)
pci_write_config8(dev, offset + 4, reg8);
}
/* Parts of the audio subsystem are powered by the HDA device. Therefore, one
* cannot put HDA into D3Hot. Instead perform this workaround to make some of
* the audio paths work for LPE audio. */
static void hda_work_around(device_t dev)
{
unsigned long gctl = TEMP_BASE_ADDRESS + 0x8;
/* Need to set magic register 0x43 to 0xd7 in config space. */
pci_write_config8(dev, 0x43, 0xd7);
/* Need to set bit 0 of GCTL to take the device out of reset. However,
* that requires setting up the 64-bit BAR. */
pci_write_config32(dev, PCI_BASE_ADDRESS_0, TEMP_BASE_ADDRESS);
pci_write_config32(dev, PCI_BASE_ADDRESS_1, 0);
pci_write_config8(dev, PCI_COMMAND, PCI_COMMAND_MEMORY);
write32(gctl, read32(gctl) | 0x1);
pci_write_config8(dev, PCI_COMMAND, 0);
pci_write_config32(dev, PCI_BASE_ADDRESS_0, 0);
}
static int place_device_in_d3hot(device_t dev)
{
unsigned offset;
/* Parts of the HDA block are used for LPE audio as well.
* Therefore assume the HDA will never be put into D3Hot. */
if (dev->path.pci.devfn == PCI_DEVFN(HDA_DEV, HDA_FUNC)) {
hda_work_around(dev);
return 0;
}
offset = pci_find_capability(dev, PCI_CAP_ID_PM);
if (offset != 0) {