brcm2708: update linux 4.4 patches to latest version

As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

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

1 files changed, 0 insertions, 126 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0452-drm-vc4-Make-pageflip-completion-handling-more-robus.patch b/target/linux/brcm2708/patches-4.4/0452-drm-vc4-Make-pageflip-completion-handling-more-robus.patch
deleted file mode 100644
index 00701f8334..0000000000
--- a/target/linux/brcm2708/patches-4.4/0452-drm-vc4-Make-pageflip-completion-handling-more-robus.patch
+++ /dev/null
@@ -1,126 +0,0 @@
-From cb182bb6180c57b28636669a613861023fd8f03d Mon Sep 17 00:00:00 2001
-From: Mario Kleiner <mario.kleiner.de@gmail.com>
-Date: Wed, 18 May 2016 14:02:46 +0200
-Subject: [PATCH] drm/vc4: Make pageflip completion handling more robust.
-
-Protect both the setup of the pageflip event and the
-latching of the new requested displaylist head pointer
-by the event lock, so we can't get into a situation
-where vc4_atomic_flush latches the new display list via
-HVS_WRITE, then immediately gets preempted before queueing
-the pageflip event, then the page-flip completes in hw and
-the vc4_crtc_handle_page_flip() runs and no-ops due to
-lack of a pending pageflip event, then vc4_atomic_flush
-continues and only then queues the pageflip event - after
-the page flip handling already no-oped. This would cause
-flip completion handling only at the next vblank - one
-frame too late.
-
-In vc4_crtc_handle_page_flip() check the actual DL head
-pointer in SCALER_DISPLACTX against the requested pointer
-for page flip to make sure that the flip actually really
-completed in the current vblank and doesn't get deferred
-to the next one because the DL head pointer was written
-a bit too late into SCALER_DISPLISTX, after start of
-vblank, and missed the boat. This avoids handling a
-pageflip completion too early - one frame too early.
-
-According to Eric, DL head pointer updates which were
-written into the HVS DISPLISTX reg get committed to hardware
-at the last pixel of active scanout. Our vblank interrupt
-handler, as triggered by PV_INT_VFP_START irq, gets to run
-earliest at the first pixel of HBLANK at the end of the
-last scanline of active scanout, ie. vblank irq handling
-runs at least 1 pixel duration after a potential pageflip
-completion happened in hardware.
-
-This ordering of events in the hardware, together with the
-lock protection and SCALER_DISPLACTX sampling of this patch,
-guarantees that pageflip completion handling only runs at
-exactly the vblank irq of actual pageflip completion in all
-cases.
-
-Background info from Eric about the relative timing of
-HVS, PV's and trigger points for interrupts, DL updates:
-
-https://lists.freedesktop.org/archives/dri-devel/2016-May/107510.html
-
-Tested on RPi 2B with hardware timing measurement equipment
-and shown to no longer complete flips too early or too late.
-
-Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
-Reviewed-by: Eric Anholt <eric@anholt.net>
-(cherry picked from commit 56d1fe0979dc9b73c1c12ee07722ac380d42a0c4)
----
- drivers/gpu/drm/vc4/vc4_crtc.c | 28 ++++++++++++++++++----------
- drivers/gpu/drm/vc4/vc4_regs.h |  4 ++++
- 2 files changed, 22 insertions(+), 10 deletions(-)
-
---- a/drivers/gpu/drm/vc4/vc4_crtc.c
-+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
-@@ -465,14 +465,6 @@ static void vc4_crtc_atomic_flush(struct
- 
- 	WARN_ON_ONCE(dlist_next - dlist_start != vc4_state->mm.size);
- 
--	HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
--		  vc4_state->mm.start);
--
--	if (debug_dump_regs) {
--		DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
--		vc4_hvs_dump_state(dev);
--	}
--
- 	if (crtc->state->event) {
- 		unsigned long flags;
- 
-@@ -482,8 +474,20 @@ static void vc4_crtc_atomic_flush(struct
- 
- 		spin_lock_irqsave(&dev->event_lock, flags);
- 		vc4_crtc->event = crtc->state->event;
--		spin_unlock_irqrestore(&dev->event_lock, flags);
- 		crtc->state->event = NULL;
-+
-+		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
-+			  vc4_state->mm.start);
-+
-+		spin_unlock_irqrestore(&dev->event_lock, flags);
-+	} else {
-+		HVS_WRITE(SCALER_DISPLISTX(vc4_crtc->channel),
-+			  vc4_state->mm.start);
-+	}
-+
-+	if (debug_dump_regs) {
-+		DRM_INFO("CRTC %d HVS after:\n", drm_crtc_index(crtc));
-+		vc4_hvs_dump_state(dev);
- 	}
- }
- 
-@@ -509,10 +513,14 @@ static void vc4_crtc_handle_page_flip(st
- {
- 	struct drm_crtc *crtc = &vc4_crtc->base;
- 	struct drm_device *dev = crtc->dev;
-+	struct vc4_dev *vc4 = to_vc4_dev(dev);
-+	struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(crtc->state);
-+	u32 chan = vc4_crtc->channel;
- 	unsigned long flags;
- 
- 	spin_lock_irqsave(&dev->event_lock, flags);
--	if (vc4_crtc->event) {
-+	if (vc4_crtc->event &&
-+	    (vc4_state->mm.start == HVS_READ(SCALER_DISPLACTX(chan)))) {
- 		drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
- 		vc4_crtc->event = NULL;
- 		drm_crtc_vblank_put(crtc);
---- a/drivers/gpu/drm/vc4/vc4_regs.h
-+++ b/drivers/gpu/drm/vc4/vc4_regs.h
-@@ -343,6 +343,10 @@
- #define SCALER_DISPLACT0                        0x00000030
- #define SCALER_DISPLACT1                        0x00000034
- #define SCALER_DISPLACT2                        0x00000038
-+#define SCALER_DISPLACTX(x)			(SCALER_DISPLACT0 +	\
-+						 (x) * (SCALER_DISPLACT1 - \
-+							SCALER_DISPLACT0))
-+
- #define SCALER_DISPCTRL0                        0x00000040
- # define SCALER_DISPCTRLX_ENABLE		BIT(31)
- # define SCALER_DISPCTRLX_RESET			BIT(30)