[Bug 100302] [GLK] Fifo underrun when changing resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100302

--- Comment #8 from Luis Botello <luis.botello.ortega at intel.com> ---
(In reply to Ander Conselvan de Oliveira from comment #6)
> Created attachment 130896 [details] [review]
> Workaround patch
> 
> I found a better workaround. If DPF clock gating is disabled before the pipe
> scaler is enabled, the underrun doesn't happen.

With this patch there is no FIFO underruns, I used this config:

======================================
             Software
======================================
kernel version              : 4.11.0-rc7-drm-tip-patch-ander-underrun-f7dd93d+
architecture                : x86_64
bios revision               : 43.30
bios release date           : 04/11/2017
ksc                         : 1.25
xf86-video-intel (tag)      : 2.99.917
xf86-video-intel (commit)   : 2.99.917-771-gb57abe2
xorg-xserver                : 1.18.4
libdrm                      : 2.4.80
vaapi (intel-driver)        : Intel i965 driver for Intel(R) Geminilake -
1.8.2.pre1 (1.7.3-382-gdbe582c)
cairo                       : 1.15.5
xserver                     : X.Org X Server 1.19.99.1
dmc version                 : 1.4

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