bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

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

1 files changed, 46 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0262-drm-vc4-Max-resolution-of-7680-is-conditional-on-bei.patch b/target/linux/bcm27xx/patches-5.4/950-0262-drm-vc4-Max-resolution-of-7680-is-conditional-on-bei.patch
new file mode 100644
index 0000000000..63931bf611
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0262-drm-vc4-Max-resolution-of-7680-is-conditional-on-bei.patch
@@ -0,0 +1,46 @@
+From 2767f778820bd7392688512ec2996943a586db6e Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.org>
+Date: Thu, 30 May 2019 15:55:15 +0100
+Subject: [PATCH] drm/vc4: Max resolution of 7680 is conditional on
+ being Pi4
+
+The max resolution had been increased from 2048 to 7680 for all
+platforms. This code is common with Pi0-3 which have a max render
+target for GL of 2048, therefore the increased resolution has to
+be conditional on the platform.
+Switch based on whether the bcm2835-v3d node is found, as that is
+not present on Pi4. (There is a potential configuration on Pi0-3
+with no v3d, but this is very unlikely).
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
+---
+ drivers/gpu/drm/vc4/vc4_kms.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_kms.c
++++ b/drivers/gpu/drm/vc4/vc4_kms.c
+@@ -18,6 +18,7 @@
+ #include <drm/drm_plane_helper.h>
+ #include <drm/drm_probe_helper.h>
+ #include <drm/drm_vblank.h>
++#include <drm/drm_drv.h>
+ 
+ #include "vc4_drv.h"
+ #include "vc4_regs.h"
+@@ -536,8 +537,14 @@ int vc4_kms_load(struct drm_device *dev)
+ 		return ret;
+ 	}
+ 
+-	dev->mode_config.max_width = 7680;
+-	dev->mode_config.max_height = 7680;
++	if (!drm_core_check_feature(dev, DRIVER_RENDER)) {
++		/* No V3D as part of vc4. Assume this is Pi4. */
++		dev->mode_config.max_width = 7680;
++		dev->mode_config.max_height = 7680;
++	} else {
++		dev->mode_config.max_width = 2048;
++		dev->mode_config.max_height = 2048;
++	}
+ 	dev->mode_config.funcs = &vc4_mode_funcs;
+ 	dev->mode_config.preferred_depth = 24;
+ 	dev->mode_config.async_page_flip = true;