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ALSA: hda/hdmi - fix vgaswitcheroo detection for AMD 

Only enable the vga_switcheroo logic on systems with the
ATPX ACPI method.  This logic is not needed for asics
that are not part of a PX (PowerXpress)/HG (Hybrid Graphics)
platform.

Reviewed-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20191122214353.582899-2-alexander.deucher@amd.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
alistair/sunxi64-5.5-dsi
Alex Deucher 2019-11-22 16:43:50 -05:00 committed by Takashi Iwai
parent bf2aa5cadd
commit 586bc4aab8
1 changed files with 45 additions and 0 deletions
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45
sound/pci/hda/hda_intel.c
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@ -35,6 +35,7 @@
#include <linux/clocksource.h>
#include <linux/time.h>
#include <linux/completion.h>
#include <linux/acpi.h>
#ifdef CONFIG_X86
/* for snoop control */
@ -1401,6 +1402,34 @@ static int azx_dev_free(struct snd_device *device)
}
#ifdef SUPPORT_VGA_SWITCHEROO
#ifdef CONFIG_ACPI
/* ATPX is in the integrated GPU's namespace */
static bool atpx_present(void)
{
struct pci_dev *pdev = NULL;
acpi_handle dhandle, atpx_handle;
acpi_status status;
while ((pdev = pci_get_class(PCI_BASE_CLASS_DISPLAY << 16, pdev)) != NULL) {
dhandle = ACPI_HANDLE(&pdev->dev);
if (dhandle) {
status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
if (!ACPI_FAILURE(status)) {
pci_dev_put(pdev);
return true;
}
}
pci_dev_put(pdev);
}
return false;
}
#else
static bool atpx_present(void)
{
return false;
}
#endif
/*
* Check of disabled HDMI controller by vga_switcheroo
*/
@ -1412,6 +1441,22 @@ static struct pci_dev *get_bound_vga(struct pci_dev *pci)
switch (pci->vendor) {
case PCI_VENDOR_ID_ATI:
case PCI_VENDOR_ID_AMD:
if (pci->devfn == 1) {
p = pci_get_domain_bus_and_slot(pci_domain_nr(pci->bus),
pci->bus->number, 0);
if (p) {
/* ATPX is in the integrated GPU's ACPI namespace
* rather than the dGPU's namespace. However,
* the dGPU is the one who is involved in
* vgaswitcheroo.
*/
if (((p->class >> 16) == PCI_BASE_CLASS_DISPLAY) &&
atpx_present())
return p;
pci_dev_put(p);
}
}
break;
case PCI_VENDOR_ID_NVIDIA:
if (pci->devfn == 1) {
p = pci_get_domain_bus_and_slot(pci_domain_nr(pci->bus),