baytrail: HDA function disable workaround
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> Reviewed-on: http://review.coreboot.org/4926 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
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@ -31,6 +31,7 @@
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#define PUNIT_BASE_ADDRESS 0xfed05000
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#define RCBA_BASE_ADDRESS 0xfed1c000
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#define HPET_BASE_ADDRESS 0xfed00000
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#define TEMP_BASE_ADDRESS 0xfd000000
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/* IO Port base */
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#define ACPI_BASE_ADDRESS 0x0400
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@ -238,10 +238,37 @@ static inline void set_d3hot_bits(device_t dev, int offset)
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pci_write_config8(dev, offset + 4, reg8);
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}
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/* Parts of the audio subsystem are powered by the HDA device. Therefore, one
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* cannot put HDA into D3Hot. Instead perform this workaround to make some of
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* the audio paths work for LPE audio. */
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static void hda_work_around(device_t dev)
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{
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unsigned long gctl = TEMP_BASE_ADDRESS + 0x8;
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/* Need to set magic register 0x43 to 0xd7 in config space. */
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pci_write_config8(dev, 0x43, 0xd7);
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/* Need to set bit 0 of GCTL to take the device out of reset. However,
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* that requires setting up the 64-bit BAR. */
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pci_write_config32(dev, PCI_BASE_ADDRESS_0, TEMP_BASE_ADDRESS);
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pci_write_config32(dev, PCI_BASE_ADDRESS_1, 0);
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pci_write_config8(dev, PCI_COMMAND, PCI_COMMAND_MEMORY);
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write32(gctl, read32(gctl) | 0x1);
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pci_write_config8(dev, PCI_COMMAND, 0);
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pci_write_config32(dev, PCI_BASE_ADDRESS_0, 0);
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}
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static int place_device_in_d3hot(device_t dev)
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{
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unsigned offset;
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/* Parts of the HDA block are used for LPE audio as well.
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* Therefore assume the HDA will never be put into D3Hot. */
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if (dev->path.pci.devfn == PCI_DEVFN(HDA_DEV, HDA_FUNC)) {
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hda_work_around(dev);
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return 0;
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}
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offset = pci_find_capability(dev, PCI_CAP_ID_PM);
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if (offset != 0) {
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