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Subject[PATCH 3.8 033/121] drm/radeon: fix ATPX detection on non-VGA GPUs
Date
3.8.13.24 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexdeucher@gmail.com>

commit e9a4099a59cc598a44006059dd775c25e422b772 upstream.

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: airlied@gmail.com
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/gpu/drm/radeon/radeon_atpx_handler.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index cbb06d7..8c44ef5 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -523,6 +523,13 @@ 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",
--
1.9.1
--
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