linux-kernel - [PATCH 3.2 79/92] drm/radeon: handle non-VGA class pci devices with ATRM

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Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Christian König" <christian.koenig@....com>,
	"Alex Deucher" <alexdeucher@...il.com>,
	"Alex Deucher" <alexander.deucher@....com>
Subject: [PATCH 3.2 79/92] drm/radeon: handle non-VGA class pci devices
 with ATRM

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Alex Deucher <alexdeucher@...il.com>

commit d8ade3526b2aa0505132c404c05a38b73ea15490 upstream.

Newer PX systems have non-VGA pci class dGPUs.  Update
the ATRM fetch method to handle those cases.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=75401

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Christian König <christian.koenig@....com>
[bwh: Backported to 3.2: s/ACPI_HANDLE()/DEVICE_ACPI_HANDLE()/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/radeon/radeon_bios.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_bios.c
+++ b/drivers/gpu/drm/radeon/radeon_bios.c
@@ -173,6 +173,20 @@ static bool radeon_atrm_get_bios(struct
 		}
 	}
 
+	if (!found) {
+		while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
+			dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
+			if (!dhandle)
+				continue;
+
+			status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
+			if (!ACPI_FAILURE(status)) {
+				found = true;
+				break;
+			}
+		}
+	}
+
 	if (!found)
 		return false;
 

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