linux-kernel - [PATCH 1/2] drm/msm/adreno: allow headless setup on SM8150 MTP

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Date: Sun, 23 Jun 2024 21:34:19 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Rob Clark <robdclark@...il.com>,
	Sean Paul <sean@...rly.run>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/2] drm/msm/adreno: allow headless setup on SM8150 MTP

Commit f30ac26def18 ("arm64: dts: qcom: add sm8150 GPU nodes") re-used
amd,imageon compatible for the SM8150 just to enable headless mode due
to missing display controller nodes.  This work-around was later
narrowed to the SM8150 MTP board in commit 1642ab96efa4 ("arm64: dts:
qcom: sm8150: Don't start Adreno in headless mode").

This was not a correct solution, because the Qualcomm SM8150 SoC does
not have an AMD GPU and the SM8150 MTP board does not have magically
different GPU than SM8150 SoC.

Rely on board compatible to achieve the same in a Devicetree-correct
way.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/gpu/drm/msm/adreno/adreno_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index c3703a51287b..a8afe0b6429b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -838,7 +838,8 @@ static int adreno_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	if (of_device_is_compatible(pdev->dev.of_node, "amd,imageon"))
+	if (of_device_is_compatible(pdev->dev.of_node, "amd,imageon") ||
+	    of_machine_is_compatible("qcom,sm8150-mtp"))
 		adreno_device_register_headless();
 
 	return 0;
-- 
2.43.0