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    Subject[PATCH 4.14 068/140] drm/amd/powerplay/vega10: allow mclk switching with no displays
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alex Deucher <alexander.deucher@amd.com>

    commit 5825acf5c958a6820b04e9811caeb2f5e572bcd8 upstream.

    If there are no displays attached, there is no reason to disable
    mclk switching.

    Fixes mclks getting set to high when there are no displays attached.

    Reviewed-by: Eric Huang <JinhuiEric.Huang@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c | 11 +++++++----
    1 file changed, 7 insertions(+), 4 deletions(-)

    --- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
    +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
    @@ -3243,10 +3243,13 @@ static int vega10_apply_state_adjust_rul
    force_mclk_high = phm_cap_enabled(hwmgr->platform_descriptor.platformCaps,
    PHM_PlatformCaps_ForceMclkHigh);

    - disable_mclk_switching = (info.display_count > 1) ||
    - disable_mclk_switching_for_frame_lock ||
    - disable_mclk_switching_for_vr ||
    - force_mclk_high;
    + if (info.display_count == 0)
    + disable_mclk_switching = false;
    + else
    + disable_mclk_switching = (info.display_count > 1) ||
    + disable_mclk_switching_for_frame_lock ||
    + disable_mclk_switching_for_vr ||
    + force_mclk_high;

    sclk = vega10_ps->performance_levels[0].gfx_clock;
    mclk = vega10_ps->performance_levels[0].mem_clock;

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