bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

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

1 files changed, 43 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0268-drm-vc4-Ignore-HVS-unless-initialised.patch b/target/linux/bcm27xx/patches-5.4/950-0268-drm-vc4-Ignore-HVS-unless-initialised.patch
new file mode 100644
index 0000000000..f17f4be37d
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0268-drm-vc4-Ignore-HVS-unless-initialised.patch
@@ -0,0 +1,43 @@
+From cad68ea70d649cff90102022c5d161bf84e4ed16 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 19 Jul 2019 14:29:28 +0100
+Subject: [PATCH] drm/vc4: Ignore HVS unless initialised
+
+An upstream commit to report HVS underruns causes VC4 in firmware KMS
+mode to cross into the HVS side, where it crashes due to a NULL hvs
+pointer.
+
+Make the underrun masking conditional on the hvs pointer being
+initialised.
+
+Fixes: 531a1b622da9 ("drm/vc4: Report HVS underrun errors")
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/gpu/drm/vc4/vc4_crtc.c | 3 ++-
+ drivers/gpu/drm/vc4/vc4_kms.c  | 2 +-
+ 2 files changed, 3 insertions(+), 2 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_crtc.c
++++ b/drivers/gpu/drm/vc4/vc4_crtc.c
+@@ -801,7 +801,8 @@ static void vc4_crtc_handle_page_flip(st
+ 		 * the CRTC and encoder already reconfigured, leading to
+ 		 * underruns. This can be seen when reconfiguring the CRTC.
+ 		 */
+-		vc4_hvs_unmask_underrun(dev, vc4_crtc->channel);
++		if (vc4->hvs)
++			vc4_hvs_unmask_underrun(dev, vc4_crtc->channel);
+ 	}
+ 	spin_unlock_irqrestore(&dev->event_lock, flags);
+ }
+--- a/drivers/gpu/drm/vc4/vc4_kms.c
++++ b/drivers/gpu/drm/vc4/vc4_kms.c
+@@ -156,7 +156,7 @@ vc4_atomic_complete_commit(struct drm_at
+ 	struct vc4_crtc *vc4_crtc;
+ 	int i;
+ 
+-	for (i = 0; i < dev->mode_config.num_crtc; i++) {
++	for (i = 0; vc4->hvs && i < dev->mode_config.num_crtc; i++) {
+ 		if (!state->crtcs[i].ptr || !state->crtcs[i].commit)
+ 			continue;
+