bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0901-drm-vc4-drv-Register-a-different-driver-on-BCM2711.patch b/target/linux/bcm27xx/patches-5.15/950-0901-drm-vc4-drv-Register-a-different-driver-on-BCM2711.patch
new file mode 100644
index 0000000000..515a3b59a4
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0901-drm-vc4-drv-Register-a-different-driver-on-BCM2711.patch
@@ -0,0 +1,128 @@
+From bf001e8bacbf627525ec90027bfea19b788d6d8e Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Thu, 21 Apr 2022 11:08:22 +0200
+Subject: [PATCH] drm/vc4: drv: Register a different driver on BCM2711
+
+Prior to the BCM2711/RaspberryPi4, the GPU was a part of the display
+components of the SoC. It was thus a part of the vc4 driver.
+
+However, with the BCM2711, it got split out and thus the v3d driver was
+created. The vc4 driver now only handles the display part.
+
+We didn't properly split out the code when doing the BCM2711 support
+though, and most of the code around buffer allocations is still
+involved, even though it doesn't have the backing hardware anymore.
+
+Let's start the split out by creating a new drm_driver that only reports
+and uses what we support on the BCM2711. The ioctl were properly
+filtered already, but we were still exposing a .gem_create_object hook,
+as well as having an .open and .postclose hooks which are only relevant
+on older generations.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_drv.c | 51 ++++++++++++++++++++++++++++-------
+ 1 file changed, 42 insertions(+), 9 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_drv.c
++++ b/drivers/gpu/drm/vc4/vc4_drv.c
+@@ -78,6 +78,19 @@ int vc4_dumb_fixup_args(struct drm_mode_
+ 	return 0;
+ }
+ 
++static int vc4_dumb_create(struct drm_file *file_priv,
++			   struct drm_device *dev,
++			   struct drm_mode_create_dumb *args)
++{
++	int ret;
++
++	ret = vc4_dumb_fixup_args(args);
++	if (ret)
++		return ret;
++
++	return drm_gem_cma_dumb_create_internal(file_priv, dev, args);
++}
++
+ static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
+ 			       struct drm_file *file_priv)
+ {
+@@ -175,7 +188,7 @@ static const struct drm_ioctl_desc vc4_d
+ 	DRM_IOCTL_DEF_DRV(VC4_PERFMON_GET_VALUES, vc4_perfmon_get_values_ioctl, DRM_RENDER_ALLOW),
+ };
+ 
+-static struct drm_driver vc4_drm_driver = {
++static const struct drm_driver vc4_drm_driver = {
+ 	.driver_features = (DRIVER_MODESET |
+ 			    DRIVER_ATOMIC |
+ 			    DRIVER_GEM |
+@@ -204,6 +217,27 @@ static struct drm_driver vc4_drm_driver
+ 	.patchlevel = DRIVER_PATCHLEVEL,
+ };
+ 
++static const struct drm_driver vc5_drm_driver = {
++	.driver_features = (DRIVER_MODESET |
++			    DRIVER_ATOMIC |
++			    DRIVER_GEM),
++
++#if defined(CONFIG_DEBUG_FS)
++	.debugfs_init = vc4_debugfs_init,
++#endif
++
++	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(vc4_dumb_create),
++
++	.fops = &vc4_drm_fops,
++
++	.name = DRIVER_NAME,
++	.desc = DRIVER_DESC,
++	.date = DRIVER_DATE,
++	.major = DRIVER_MAJOR,
++	.minor = DRIVER_MINOR,
++	.patchlevel = DRIVER_PATCHLEVEL,
++};
++
+ static int compare_dev(struct device *dev, void *data)
+ {
+ 	return dev == data;
+@@ -254,6 +288,7 @@ static bool firmware_kms(void)
+ static int vc4_drm_bind(struct device *dev)
+ {
+ 	struct platform_device *pdev = to_platform_device(dev);
++	const struct drm_driver *driver;
+ 	struct rpi_firmware *firmware = NULL;
+ 	struct drm_device *drm;
+ 	struct vc4_dev *vc4;
+@@ -265,12 +300,10 @@ static int vc4_drm_bind(struct device *d
+ 	dev->coherent_dma_mask = DMA_BIT_MASK(32);
+ 
+ 	is_vc5 = of_device_is_compatible(dev->of_node, "brcm,bcm2711-vc5");
+-
+-	/* If VC4 V3D is missing, don't advertise render nodes. */
+-	node = of_find_matching_node_and_match(NULL, vc4_v3d_dt_match, NULL);
+-	if (!node || !of_device_is_available(node))
+-		vc4_drm_driver.driver_features &= ~DRIVER_RENDER;
+-	of_node_put(node);
++	if (is_vc5)
++		driver = &vc5_drm_driver;
++	else
++		driver = &vc4_drm_driver;
+ 
+ 	node = of_find_matching_node_and_match(NULL, vc4_dma_range_matches,
+ 					       NULL);
+@@ -282,7 +315,7 @@ static int vc4_drm_bind(struct device *d
+ 			return ret;
+ 	}
+ 
+-	vc4 = devm_drm_dev_alloc(dev, &vc4_drm_driver, struct vc4_dev, base);
++	vc4 = devm_drm_dev_alloc(dev, driver, struct vc4_dev, base);
+ 	if (IS_ERR(vc4))
+ 		return PTR_ERR(vc4);
+ 	vc4->is_vc5 = is_vc5;
+@@ -314,7 +347,7 @@ static int vc4_drm_bind(struct device *d
+ 			return -EPROBE_DEFER;
+ 	}
+ 
+-	ret = drm_aperture_remove_framebuffers(false, &vc4_drm_driver);
++	ret = drm_aperture_remove_framebuffers(false, driver);
+ 	if (ret)
+ 		return ret;
+