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authorhersen wu <hersenxs.wu@amd.com>2019-08-02 16:01:37 -0400
committerAlex Deucher <alexander.deucher@amd.com>2019-08-23 11:46:02 -0500
commitf49cfa279b9a2214172d13e87fe6a11bd3941f67 (patch)
treeeb29f996558047584af36c5bdab96cedc27c072f /drivers/nubus
parent9a7bfcb6acee07ae891ad28d40a1535aab3134a9 (diff)
drm/amd/display: flicking observed while installing driver on Navi10 CF
[WHY] value of dchub_ref_clock is decided by dchubbub global timer settings which is programmed by vbios command table disp_init. for multi-GPU case, vbios is posted only for primary GPU. without vbios posted for the secondary GPU, value of dchub_ref_clock is not set properly. this value will affect dcn bandwidth calcuation and cause underflow. user will see screen flicking during driver installation for dual GPU case. [HOW] dc init_hw always call vbios command table disp_init to make sure dchubbub global timer is configured and enable. Signed-off-by: hersen wu <hersenxs.wu@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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