linux-kernel - [PATCH] drm/amdgpu: Fix rejecting Tahiti GPUs

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Date:   Fri, 14 Jan 2022 07:51:41 +0100
From:   Lukas Fink <lukas.fink1@...il.com>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com
Cc:     amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Lukas Fink <lukas.fink1@...il.com>
Subject: [PATCH] drm/amdgpu: Fix rejecting Tahiti GPUs

eb4fd29afd4a ("drm/amdgpu: bind to any 0x1002 PCI diplay class device") added
generic bindings to amdgpu so that that it binds to all display class devices
with VID 0x1002 and then rejects those in amdgpu_pci_probe.

Unfortunately it reuses a driver_data value of 0 to detect those new bindings,
which is already used to denote CHIP_TAHITI ASICs.

The driver_data value given to those new bindings was changed in
dd0761fd24ea1 ("drm/amdgpu: set CHIP_IP_DISCOVERY as the asic type by default")
to CHIP_IP_DISCOVERY (=36), but it seems that the check in amdgpu_pci_probe
was forgotten to be changed. Therefore, it still rejects Tahiti GPUs.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1860
Fixes: eb4fd29afd4a ("drm/amdgpu: bind to any 0x1002 PCI diplay class device")

Signed-off-by: Lukas Fink <lukas.fink1@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 9ec58bf74012..224d073022ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1903,7 +1903,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 			return -ENODEV;
 	}

-	if (flags == 0) {
+	if (flags == CHIP_IP_DISCOVERY) {
 		DRM_INFO("Unsupported asic.  Remove me when IP discovery init is in place.\n");
 		return -ENODEV;
 	}
-- 
2.34.1