target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch

   1 From c4bd9665b145cacfdf9cbd5f3d83ed0961080236 Mon Sep 17 00:00:00 2001
   2 From: Mario Kleiner <mario.kleiner.de@gmail.com>
   3 Date: Tue, 19 Jul 2016 20:59:01 +0200
   4 Subject: [PATCH] drm/vc4: Enable/Disable vblanks properly in crtc en/disable.
   5
   6 Add missing drm_crtc_vblank_on/off() calls so vblank irq
   7 handling/updating/timestamping never runs with a crtc shut down
   8 or during its shutdown/startup, as that causes large jumps in
   9 vblank count and trouble for compositors.
  10
  11 Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
  12 Signed-off-by: Eric Anholt <eric@anholt.net>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
  15  1 file changed, 6 insertions(+)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_crtc.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
  19 @@ -468,6 +468,9 @@ static void vc4_crtc_disable(struct drm_
  20         int ret;
  21         require_hvs_enabled(dev);
  22
  23 +       /* Disable vblank irq handling before crtc is disabled. */
  24 +       drm_crtc_vblank_off(crtc);
  25 +
  26         if (VC4_DSI_USE_FIRMWARE_SETUP &&
  27             (CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_DSI)) {
  28                 /* Skip disabling the PV/HVS for the channel if it was
  29 @@ -531,6 +534,9 @@ static void vc4_crtc_enable(struct drm_c
  30         /* Turn on the pixel valve, which will emit the vstart signal. */
  31         CRTC_WRITE(PV_V_CONTROL,
  32                    CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
  33 +
  34 +       /* Enable vblank irq handling after crtc is started. */
  35 +       drm_crtc_vblank_on(crtc);
  36  }
  37
  38  static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,