linux-kernel - [PATCH] drm/msm/adreno: Check for zap node availability

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Date: Fri, 17 May 2024 12:50:19 -0700
From: Rob Clark <robdclark@...il.com>
To: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org,
	linux-arm-msm@...r.kernel.org,
	Rob Clark <robdclark@...omium.org>,
	Nikita Travkin <nikita@...n.ru>,
	Rob Clark <robdclark@...il.com>,
	Abhinav Kumar <quic_abhinavk@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Sean Paul <sean@...rly.run>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Bjorn Andersson <quic_bjorande@...cinc.com>,
	Connor Abbott <cwabbott0@...il.com>,
	Ruan Jinjie <ruanjinjie@...wei.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/msm/adreno: Check for zap node availability

From: Rob Clark <robdclark@...omium.org>

This should allow disabling the zap node via an overlay, for slbounce.

Suggested-by: Nikita Travkin <nikita@...n.ru>
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index d9ea15994ae9..a00241e3373b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -46,7 +46,7 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
 	}
 
 	np = of_get_child_by_name(dev->of_node, "zap-shader");
-	if (!np) {
+	if (!np || !of_device_is_available(np)) {
 		zap_available = false;
 		return -ENODEV;
 	}
-- 
2.45.1