drm/amd/display: Update downspread percent to match spreadsheet for DCN2.1

[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>

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 8fcb03e65fdb1b3cb58f3a3afe72678f0fe56475..802372f09dc7274b79eefb37fab37f7c653f3926 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -286,7 +286,7 @@ 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,