target/linux/brcm2708/patches-4.19/950-0764-v3d_gem-Kick-the-clock-so-firmware-knows-we-are-usin.patch

   1 From ccf2b80332ba86e5a69f7e3a0f097d9558ad5c95 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Thu, 5 Sep 2019 17:59:14 +0100
   4 Subject: [PATCH] v3d_gem: Kick the clock so firmware knows we are
   5  using firmware clock interface
   6
   7 Setting the v3d clock to low value allows firmware to handle dvfs in case
   8 where v3d hardware is not being actively used (e.g. console use).
   9
  10 Signed-off-by: popcornmix <popcornmix@gmail.com>
  11 ---
  12  drivers/gpu/drm/v3d/v3d_gem.c | 4 ++++
  13  1 file changed, 4 insertions(+)
  14
  15 --- a/drivers/gpu/drm/v3d/v3d_gem.c
  16 +++ b/drivers/gpu/drm/v3d/v3d_gem.c
  17 @@ -1050,6 +1050,10 @@ v3d_gem_init(struct drm_device *dev)
  18         mutex_init(&v3d->clk_lock);
  19         INIT_DELAYED_WORK(&v3d->clk_down_work, v3d_clock_down_work);
  20
  21 +       /* kick the clock so firmware knows we are using firmware clock interface */
  22 +       v3d_clock_up_get(v3d);
  23 +       v3d_clock_up_put(v3d);
  24 +
  25         /* Note: We don't allocate address 0.  Various bits of HW
  26          * treat 0 as special, such as the occlusion query counters
  27          * where 0 means "disabled".