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, 69 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0024-drm-vc4-Notify-the-firmware-when-DRM-is-in-charge.patch b/target/linux/bcm27xx/patches-5.15/950-0024-drm-vc4-Notify-the-firmware-when-DRM-is-in-charge.patch
new file mode 100644
index 0000000000..04db8fb1d5
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0024-drm-vc4-Notify-the-firmware-when-DRM-is-in-charge.patch
@@ -0,0 +1,69 @@
+From 9e9177db83609c19bbe523cc4d20119cf09ea787 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Wed, 15 Dec 2021 10:51:17 +0100
+Subject: [PATCH] drm/vc4: Notify the firmware when DRM is in charge
+
+Once the call to drm_fb_helper_remove_conflicting_framebuffers() has
+been made, simplefb has been unregistered and the KMS driver is entirely
+in charge of the display.
+
+Thus, we can notify the firmware it can free whatever resource it was
+using to maintain simplefb functional.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
+Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
+Link: https://patchwork.freedesktop.org/patch/msgid/20211215095117.176435-5-maxime@cerno.tech
+---
+ drivers/gpu/drm/vc4/vc4_drv.c | 22 ++++++++++++++++++++++
+ 1 file changed, 22 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_drv.c
++++ b/drivers/gpu/drm/vc4/vc4_drv.c
+@@ -37,6 +37,8 @@
+ #include <drm/drm_fb_helper.h>
+ #include <drm/drm_vblank.h>
+ 
++#include <soc/bcm2835/raspberrypi-firmware.h>
++
+ #include "uapi/drm/vc4_drm.h"
+ 
+ #include "vc4_drv.h"
+@@ -217,6 +219,7 @@ static void vc4_match_add_drivers(struct
+ static int vc4_drm_bind(struct device *dev)
+ {
+ 	struct platform_device *pdev = to_platform_device(dev);
++	struct rpi_firmware *firmware = NULL;
+ 	struct drm_device *drm;
+ 	struct vc4_dev *vc4;
+ 	struct device_node *node;
+@@ -253,10 +256,29 @@ static int vc4_drm_bind(struct device *d
+ 	if (ret)
+ 		return ret;
+ 
++	node = of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware");
++	if (node) {
++		firmware = rpi_firmware_get(node);
++		of_node_put(node);
++
++		if (!firmware)
++			return -EPROBE_DEFER;
++	}
++
+ 	ret = drm_aperture_remove_framebuffers(false, &vc4_drm_driver);
+ 	if (ret)
+ 		return ret;
+ 
++	if (firmware) {
++		ret = rpi_firmware_property(firmware,
++					    RPI_FIRMWARE_NOTIFY_DISPLAY_DONE,
++					    NULL, 0);
++		if (ret)
++			drm_warn(drm, "Couldn't stop firmware display driver: %d\n", ret);
++
++		rpi_firmware_put(firmware);
++	}
++
+ 	ret = component_bind_all(dev, drm);
+ 	if (ret)
+ 		return ret;