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    Subject[PATCH 5.6 064/194] drm/amd/display: Update downspread percent to match spreadsheet for DCN2.1
    Date
    From: Sung Lee <sung.lee@amd.com>

    [ Upstream commit 668a6741f809f2d15d125cfe2b39661e8f1655ea ]

    [WHY]
    The downspread percentage was copied over from a previous version
    of the display_mode_lib spreadsheet. This value has been updated,
    and the previous value is too high to allow for such modes as
    4K120hz. The new value is sufficient for such modes.

    [HOW]
    Update the value in dcn21_resource to match the spreadsheet.

    Signed-off-by: Sung Lee <sung.lee@amd.com>
    Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
    Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
    index 33d0a176841a5..122d3e734c59a 100644
    --- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
    +++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
    @@ -250,7 +250,7 @@ struct _vcs_dpi_soc_bounding_box_st dcn2_1_soc = {
    .dram_channel_width_bytes = 4,
    .fabric_datapath_to_dcn_data_return_bytes = 32,
    .dcn_downspread_percent = 0.5,
    - .downspread_percent = 0.5,
    + .downspread_percent = 0.38,
    .dram_page_open_time_ns = 50.0,
    .dram_rw_turnaround_time_ns = 17.5,
    .dram_return_buffer_per_channel_bytes = 8192,
    --
    2.20.1


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