target/linux/bcm27xx/patches-4.19/950-0112-drm-vc4-Fix-warning-about-vblank-interrupts-before-D.patch

   1 From 36e1081459121883f9881a579c809c7b87895146 Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Mon, 5 Feb 2018 18:01:02 +0000
   4 Subject: [PATCH] drm/vc4: Fix warning about vblank interrupts before
   5  DRM core is ready.
   6
   7 The SMICS interrupt fires continuously, but since it's 1/100 the rate
   8 of the USB interrupts, we don't really need a way to turn it off.  We
   9 do need to make sure that we don't tell DRM about it until DRM has
  10 asked for the interrupt at least once, because otherwise it will throw
  11 a warning at boot time.
  12
  13 Signed-off-by: Eric Anholt <eric@anholt.net>
  14 ---
  15  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 10 ++++++----
  16  1 file changed, 6 insertions(+), 4 deletions(-)
  17
  18 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  20 @@ -43,6 +43,7 @@ struct vc4_crtc {
  21
  22         struct drm_pending_vblank_event *event;
  23         u32 overscan[4];
  24 +       bool vblank_enabled;
  25  };
  26
  27  static inline struct vc4_crtc *to_vc4_crtc(struct drm_crtc *crtc)
  28 @@ -420,7 +421,8 @@ static irqreturn_t vc4_crtc_irq_handler(
  29
  30         if (stat & SMICS_INTERRUPTS) {
  31                 writel(0, vc4_crtc->regs + SMICS);
  32 -               drm_crtc_handle_vblank(&vc4_crtc->base);
  33 +               if (vc4_crtc->vblank_enabled)
  34 +                       drm_crtc_handle_vblank(&vc4_crtc->base);
  35                 vc4_crtc_handle_page_flip(vc4_crtc);
  36                 ret = IRQ_HANDLED;
  37         }
  38 @@ -443,9 +445,9 @@ static int vc4_page_flip(struct drm_crtc
  39
  40  static int vc4_fkms_enable_vblank(struct drm_crtc *crtc)
  41  {
  42 -       /* XXX: Need a way to enable/disable the interrupt, to avoid
  43 -        * DRM warnings at boot time.
  44 -        */
  45 +       struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
  46 +
  47 +       vc4_crtc->vblank_enabled = true;
  48
  49         return 0;
  50  }