[Bug 104093] DP audio not work on KBL(regression issue)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104093

--- Comment #1 from Alice Liu <alice.liu at intel.com> ---
Here is the regression commit.

commit 6014ac122ed081feca99217bc57b2e15c7fc1a51
Author: Libin Yang <libin.yang at linux.intel.com>
Date:   Tue Oct 25 17:54:18 2016 +0300

    drm/i915/audio: set proper N/M in modeset

    When modeset occurs and the LS_CLK is set to some special values in DP
    mode, the N/M need to be set manually if audio is playing. Otherwise the
    first several seconds may be silent in audio playback.

    The relationship of Maud and Naud is expressed in the following
    equation:

    Maud/Naud = 512 * fs / f_LS_Clk

    Please refer VESA DisplayPort Standard spec for details.

    v2 by Jani:
    - organize Maud/Naud table according to DP 1.4 spec
    - add 64k and 128k audio rates
    - update HSW_AUD_M_CTS_ENABLE register when Maud not found
    - remove extra checks for port clock
    - simplify Maud/Naud lookup
    - reset patch author back to Libin

    Cc: "Zhang, Keqiao" <keqiao.zhang at intel.com>
    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Cc: "Lin, Mengdong" <mengdong.lin at intel.com>
    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Libin Yang <libin.yang at linux.intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1477407258-30599-3-git-send-email-jani.nikula@intel.com

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