linux-kernel - [PATCH] drm/gud: rearrange gud_probe() to prepare for function splitting

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Message-ID: <20251019185642.14266-2-rubenru09@aol.com>
Date: Sun, 19 Oct 2025 19:53:48 +0100
From: Ruben Wauters <rubenru09@....com>
To: 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>
Cc: Ruben Wauters <rubenru09@....com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/gud: rearrange gud_probe() to prepare for function splitting

gud_prove() is currently very large and does many things, including
pipeline setup and feature detection, as well as having USB functions.

This patch re-orders the code in gud_probe() to make it more organised
and easier to split apart in the future.

Signed-off-by: Ruben Wauters <rubenru09@....com>
---
I wanted to move mode config to just before pipeline init, however mode
config is edited in feature detection so I was unsure how to go about it
exactly.
Further untangling of this may be required before splitting it out
---
 drivers/gpu/drm/gud/gud_drv.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/gud/gud_drv.c b/drivers/gpu/drm/gud/gud_drv.c
index b7345c8d823d..583f7f8f4c00 100644
--- a/drivers/gpu/drm/gud/gud_drv.c
+++ b/drivers/gpu/drm/gud/gud_drv.c
@@ -463,10 +463,6 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		return PTR_ERR(gdrm);
 
 	drm = &gdrm->drm;
-	drm->mode_config.funcs = &gud_mode_config_funcs;
-	ret = drmm_mode_config_init(drm);
-	if (ret)
-		return ret;
 
 	gdrm->flags = le32_to_cpu(desc.flags);
 	gdrm->compression = desc.compression & GUD_COMPRESSION_LZ4;
@@ -483,11 +479,18 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	if (ret)
 		return ret;
 
+	/* Mode config init*/
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return ret;
+
 	drm->mode_config.min_width = le32_to_cpu(desc.min_width);
 	drm->mode_config.max_width = le32_to_cpu(desc.max_width);
 	drm->mode_config.min_height = le32_to_cpu(desc.min_height);
 	drm->mode_config.max_height = le32_to_cpu(desc.max_height);
+	drm->mode_config.funcs = &gud_mode_config_funcs;
 
+	/*Format init*/
 	formats_dev = devm_kmalloc(dev, GUD_FORMATS_MAX_NUM, GFP_KERNEL);
 	/* Add room for emulated XRGB8888 */
 	formats = devm_kmalloc_array(dev, GUD_FORMATS_MAX_NUM + 1, sizeof(*formats), GFP_KERNEL);
@@ -587,6 +590,7 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 			return -ENOMEM;
 	}
 
+	/*Pipeline init*/
 	ret = drm_universal_plane_init(drm, &gdrm->plane, 0,
 				       &gud_plane_funcs,
 				       formats, num_formats,
@@ -598,15 +602,6 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	drm_plane_helper_add(&gdrm->plane, &gud_plane_helper_funcs);
 	drm_plane_enable_fb_damage_clips(&gdrm->plane);
 
-	devm_kfree(dev, formats);
-	devm_kfree(dev, formats_dev);
-
-	ret = gud_get_properties(gdrm);
-	if (ret) {
-		dev_err(dev, "Failed to get properties (error=%d)\n", ret);
-		return ret;
-	}
-
 	ret = drm_crtc_init_with_planes(drm, &gdrm->crtc, &gdrm->plane, NULL,
 					&gud_crtc_funcs, NULL);
 	if (ret)
@@ -621,6 +616,13 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	}
 
 	drm_mode_config_reset(drm);
+	drm_kms_helper_poll_init(drm);
+
+	ret = gud_get_properties(gdrm);
+	if (ret) {
+		dev_err(dev, "Failed to get properties (error=%d)\n", ret);
+		return ret;
+	}
 
 	usb_set_intfdata(intf, gdrm);
 
@@ -638,7 +640,8 @@ static int gud_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	if (ret)
 		return ret;
 
-	drm_kms_helper_poll_init(drm);
+	devm_kfree(dev, formats);
+	devm_kfree(dev, formats_dev);
 
 	drm_client_setup(drm, NULL);
 
-- 
2.51.0