dab5a44067
n 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>
47 lines
1.6 KiB
Diff
47 lines
1.6 KiB
Diff
From fcb31481cff293291c6d3e7891da4be4a302cfd1 Mon Sep 17 00:00:00 2001
|
|
From: Mario Kleiner <mario.kleiner.de@gmail.com>
|
|
Date: Fri, 6 May 2016 19:26:06 +0200
|
|
Subject: [PATCH] drm/vc4: Fix drm_vblank_put/get imbalance in page flip path.
|
|
|
|
The async page flip path was missing drm_crtc_vblank_get/put
|
|
completely. The sync flip path was missing a vblank put, so async
|
|
flips only reported proper pageflip completion events by chance,
|
|
and vblank irq's never turned off after a first vsync'ed page flip
|
|
until system reboot.
|
|
|
|
Tested against Raspian kernel 4.4.8 tree on RPi 2B.
|
|
|
|
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
|
|
Cc: Eric Anholt <eric@anholt.net>
|
|
Signed-off-by: Eric Anholt <eric@anholt.net>
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_crtc.c | 4 ++++
|
|
1 file changed, 4 insertions(+)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
|
|
@@ -506,6 +506,7 @@ static void vc4_crtc_handle_page_flip(st
|
|
if (vc4_crtc->event) {
|
|
drm_crtc_send_vblank_event(crtc, vc4_crtc->event);
|
|
vc4_crtc->event = NULL;
|
|
+ drm_crtc_vblank_put(crtc);
|
|
}
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
}
|
|
@@ -556,6 +557,7 @@ vc4_async_page_flip_complete(struct vc4_
|
|
spin_unlock_irqrestore(&dev->event_lock, flags);
|
|
}
|
|
|
|
+ drm_crtc_vblank_put(crtc);
|
|
drm_framebuffer_unreference(flip_state->fb);
|
|
kfree(flip_state);
|
|
|
|
@@ -598,6 +600,8 @@ static int vc4_async_page_flip(struct dr
|
|
return ret;
|
|
}
|
|
|
|
+ WARN_ON(drm_crtc_vblank_get(crtc) != 0);
|
|
+
|
|
/* Immediately update the plane's legacy fb pointer, so that later
|
|
* modeset prep sees the state that will be present when the semaphore
|
|
* is released.
|