linux-kernel - [PATCH v2 2/8] drm/panfrost: Handle inexistent GPU during probe

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Message-ID: <20241128211223.1805830-3-adrian.larumbe@collabora.com>
Date: Thu, 28 Nov 2024 21:06:17 +0000
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc: kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/8] drm/panfrost: Handle inexistent GPU during probe

Just in case we're dealing with a yet not recognised device.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Reviewed-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panfrost/panfrost_gpu.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index 69425104ca97..da55dc7c0552 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -236,9 +236,10 @@ static const struct panfrost_model gpu_models[] = {
 	 */
 	GPU_MODEL(g57, 0x9003,
 		GPU_REV(g57, 0, 0)),
+	{0},
 };
 
-static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
+static int panfrost_gpu_init_features(struct panfrost_device *pfdev)
 {
 	u32 gpu_id, num_js, major, minor, status, rev;
 	const char *name = "unknown";
@@ -323,6 +324,12 @@ static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
 		break;
 	}
 
+	if (!model->name) {
+		dev_err(pfdev->base.dev, "GPU model not found: mali-%s id rev %#x %#x\n",
+			name, gpu_id, rev);
+		return -ENODEV;
+	}
+
 	bitmap_from_u64(pfdev->features.hw_features, hw_feat);
 	bitmap_from_u64(pfdev->features.hw_issues, hw_issues);
 
@@ -343,6 +350,8 @@ static void panfrost_gpu_init_features(struct panfrost_device *pfdev)
 
 	dev_info(pfdev->base.dev, "shader_present=0x%0llx l2_present=0x%0llx",
 		 pfdev->features.shader_present, pfdev->features.l2_present);
+
+	return 0;
 }
 
 void panfrost_cycle_counter_get(struct panfrost_device *pfdev)
@@ -485,7 +494,9 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
 	if (err)
 		return err;
 
-	panfrost_gpu_init_features(pfdev);
+	err = panfrost_gpu_init_features(pfdev);
+	if (err)
+		return err;
 
 	err = dma_set_mask_and_coherent(pfdev->base.dev,
 					DMA_BIT_MASK(FIELD_GET(0xff00,
-- 
2.47.0