bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

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

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0228-drm-vc4-Fix-vblank-timestamping-for-firmwarekms.patch b/target/linux/bcm27xx/patches-5.4/950-0228-drm-vc4-Fix-vblank-timestamping-for-firmwarekms.patch
new file mode 100644
index 0000000000..3b03c98088
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0228-drm-vc4-Fix-vblank-timestamping-for-firmwarekms.patch
@@ -0,0 +1,53 @@
+From c71f09dafd82a37a488029f33552a45a99d0a9a6 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Tue, 2 Apr 2019 13:29:00 -0700
+Subject: [PATCH] drm/vc4: Fix vblank timestamping for firmwarekms.
+
+The core doesn't expect a false return from the scanoutpos function in
+normal usage, so we were doing the precise vblank timestamping path
+and thus "immediate" vblank disables (even though firmwarekms can't
+actually disable vblanks interrupts, sigh), and the kernel would get
+confused when getting timestamp info when also turning vblanks back
+on.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/gpu/drm/vc4/vc4_crtc.c         | 3 ---
+ drivers/gpu/drm/vc4/vc4_firmware_kms.c | 7 +++++++
+ 2 files changed, 7 insertions(+), 3 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_crtc.c
++++ b/drivers/gpu/drm/vc4/vc4_crtc.c
+@@ -97,9 +97,6 @@ bool vc4_crtc_get_scanoutpos(struct drm_
+ 	int vblank_lines;
+ 	bool ret = false;
+ 
+-	if (vc4->firmware_kms)
+-		return 0;
+-
+ 	/* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
+ 
+ 	/* Get optional system timestamp before query. */
+--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
++++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+@@ -20,6 +20,7 @@
+ #include "drm/drm_crtc_helper.h"
+ #include "drm/drm_fourcc.h"
+ #include "drm/drm_probe_helper.h"
++#include "drm/drm_drv.h"
+ #include "linux/clk.h"
+ #include "linux/debugfs.h"
+ #include "drm/drm_fb_cma_helper.h"
+@@ -673,6 +674,12 @@ static int vc4_fkms_bind(struct device *
+ 
+ 	vc4->firmware_kms = true;
+ 
++	/* firmware kms doesn't have precise a scanoutpos implementation, so
++	 * we can't do the precise vblank timestamp mode.
++	 */
++	drm->driver->get_scanout_position = NULL;
++	drm->driver->get_vblank_timestamp = NULL;
++
+ 	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
+ 	if (!vc4_crtc)
+ 		return -ENOMEM;