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drm/amd/display: Add comments to v_total calculation and drop legacy TODO

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[WHY & HOW]
This commit just adds some simple comments to help understand the
calculation of V total duration for Freesync. Also, remove a legacy TODO
comment from link service type.

Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira
2024-02-14 13:32:32 -07:00
committed by Alex Deucher
parent 2c8c7a2cd8
commit f1b8479dc9
2 changed files with 2 additions and 3 deletions
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4
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
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@@ -158,13 +158,13 @@ static unsigned int calc_v_total_from_duration(
if (duration_in_us > vrr->max_duration_in_us)
duration_in_us = vrr->max_duration_in_us;
if (dc_is_hdmi_signal(stream->signal)) {
if (dc_is_hdmi_signal(stream->signal)) { // change for HDMI to comply with spec
uint32_t h_total_up_scaled;
h_total_up_scaled = stream->timing.h_total * 10000;
v_total = div_u64((unsigned long long)duration_in_us
* stream->timing.pix_clk_100hz + (h_total_up_scaled - 1),
h_total_up_scaled);
h_total_up_scaled); //ceiling for MMax and MMin for MVRR
} else {
v_total = div64_u64(div64_u64(((unsigned long long)(
duration_in_us) * (stream->timing.pix_clk_100hz / 10)),