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drm/radeon: fix ATPX detection on non-VGA GPUs 

Some newer PX laptops have the pci device class
set to DISPLAY_OTHER rather than DISPLAY_VGA.  This
properly detects ATPX on those laptops.

Based on a patch from: Pali Rohár <pali.rohar@gmail.com>

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Cc: airlied@gmail.com
This commit is contained in:
Alex Deucher 2014-04-15 12:44:34 -04:00 committed by Christian König
parent 3ed9a335cf
commit e9a4099a59
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/radeon/radeon_atpx_handler.c
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@ -528,6 +528,13 @@ static bool radeon_atpx_detect(void)
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
/* some newer PX laptops mark the dGPU as a non-VGA display device */
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
acpi_get_name(radeon_atpx_priv.atpx.handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",