[Bug 100439] New: [GLK] cdclock frequency is always the same

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100439

            Bug ID: 100439
           Summary: [GLK] cdclock frequency is always the same
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: luis.botello.ortega at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: GLK
     i915 features: display/Other

Created attachment 130517
  --> https://bugs.freedesktop.org/attachment.cgi?id=130517&action=edit
dmesg

==Bug detailed description==
--------------------------------------------------
cdclock frequency is always the same, it does not matter if reslution is
changed on displays

==Steps to reproduce==
--------------------------------------------------
1. set a 4k resolution
2. cat /sys/kernel/debug/dri/0/i915_frequency_info |grep "Current CD clock
frequency:"
3. set a HD resolution
4. cat /sys/kernel/debug/dri/0/i915_frequency_info |grep "Current CD clock
frequency:"

==Actual results==
--------------------------------------------------
cdclock frequency is always the same (316800 kHz) , it does not matter if
reslution is changed on displays 

==Expected results==
--------------------------------------------------
cdclock frequency must change according to resolution set on display

==Hardware configuration==
--------------------------------------------------
CPU Name : Genuine Intel(R) CPU @ 1.10GHz (family: 6, model: 122) 4 cores
Graphic: Intel Corporation Device 3184 (rev 01) prog-if 00 VGA controller
RVP SKU : GLK RVP1
SOC : GML A1 Soc
QDF : Ql9R
Reworks : F23

==Software configuration==
--------------------------------------------------
kernel version            : 4.11.0-rc4-drm-tip-ww14-commit-dabd992+
architecture              : x86_64
os version                : Ubuntu 16.10
os codename               : yakkety
[sudo] password for gfx: kernel driver             : i915
bios revision             : 36.51
ksc                       : 1.13
modesetting               : modesetting_drv.so
xorg-xserver              : 1.18.4
libdrm                    : 2.4.75
vaapi (intel-driver)      : Intel i965 driver for Intel(R) Geminilake -
1.8.1.pre1 (1.7.3-358-g228e4fc)
cairo                     : 1.15.5
xserver                   : X.Org X Server 1.19.99.1
intel-gpu-tools (tag)     : intel-gpu-tools-1.18-40-g429dd43
intel-gpu-tools (commit)  : 429dd43

==kernel configuration==
--------------------------------------------------
commit dabd992961047cf26698036f563aa86a083284ac
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Tue Mar 28 18:26:27 2017 +0300

    drm-tip: 2017y-03m-28d-15h-25m-54s UTC integration manifest


Kernel version : 4.11.0-rc4-dabd992
Architecture : source amd64 all

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