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drm/amd/display: LFC not working on 2.0x range monitors (v2) 

[Why]
Nominal pixel clock and EDID information differ in precision so although
monitor reports maximum refresh is 2x minimum, LFC was not being
enabled.

[How]
Use minimum refresh rate as nominal/2 when EDID dictates that min
refresh = max refresh/2.

v2: squash in 64 bit divide fix

Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Aric Cyr 2020-03-11 18:10:20 -04:00 committed by Alex Deucher
parent 5c41c023f8
commit 5a6b545869
1 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
View File

@ -734,6 +734,7 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
{
struct core_freesync *core_freesync = NULL;
unsigned long long nominal_field_rate_in_uhz = 0;
unsigned long long rounded_nominal_in_uhz = 0;
unsigned int refresh_range = 0;
unsigned long long min_refresh_in_uhz = 0;
unsigned long long max_refresh_in_uhz = 0;
@ -750,17 +751,20 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
min_refresh_in_uhz = in_config->min_refresh_in_uhz;
max_refresh_in_uhz = in_config->max_refresh_in_uhz;
// Don't allow min > max
if (min_refresh_in_uhz > max_refresh_in_uhz)
min_refresh_in_uhz = max_refresh_in_uhz;
// Full range may be larger than current video timing, so cap at nominal
if (max_refresh_in_uhz > nominal_field_rate_in_uhz)
max_refresh_in_uhz = nominal_field_rate_in_uhz;
// Full range may be larger than current video timing, so cap at nominal
if (min_refresh_in_uhz > nominal_field_rate_in_uhz)
min_refresh_in_uhz = nominal_field_rate_in_uhz;
if (min_refresh_in_uhz > max_refresh_in_uhz)
min_refresh_in_uhz = max_refresh_in_uhz;
// If a monitor reports exactly max refresh of 2x of min, enforce it on nominal
rounded_nominal_in_uhz =
div_u64(nominal_field_rate_in_uhz + 50000, 100000) * 100000;
if (in_config->max_refresh_in_uhz == (2 * in_config->min_refresh_in_uhz) &&
in_config->max_refresh_in_uhz == rounded_nominal_in_uhz)
min_refresh_in_uhz = div_u64(nominal_field_rate_in_uhz, 2);
if (!vrr_settings_require_update(core_freesync,
in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz,
@ -792,11 +796,6 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
refresh_range = in_out_vrr->max_refresh_in_uhz -
in_out_vrr->min_refresh_in_uhz;
in_out_vrr->btr.margin_in_us = in_out_vrr->max_duration_in_us -
2 * in_out_vrr->min_duration_in_us;
if (in_out_vrr->btr.margin_in_us > BTR_MAX_MARGIN)
in_out_vrr->btr.margin_in_us = BTR_MAX_MARGIN;
in_out_vrr->supported = true;
}
@ -804,9 +803,14 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
in_out_vrr->btr.btr_enabled = in_config->btr;
if (in_out_vrr->max_refresh_in_uhz <
2 * in_out_vrr->min_refresh_in_uhz)
if (in_out_vrr->max_refresh_in_uhz < (2 * in_out_vrr->min_refresh_in_uhz))
in_out_vrr->btr.btr_enabled = false;
else {
in_out_vrr->btr.margin_in_us = in_out_vrr->max_duration_in_us -
2 * in_out_vrr->min_duration_in_us;
if (in_out_vrr->btr.margin_in_us > BTR_MAX_MARGIN)
in_out_vrr->btr.margin_in_us = BTR_MAX_MARGIN;
}
in_out_vrr->btr.btr_active = false;
in_out_vrr->btr.inserted_duration_in_us = 0;
@ -1008,8 +1012,8 @@ unsigned long long mod_freesync_calc_nominal_field_rate(
unsigned int total = stream->timing.h_total * stream->timing.v_total;
/* Calculate nominal field rate for stream, rounded up to nearest integer */
nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz / 10;
nominal_field_rate_in_uhz *= 1000ULL * 1000ULL * 1000ULL;
nominal_field_rate_in_uhz = stream->timing.pix_clk_100hz;
nominal_field_rate_in_uhz *= 100000000ULL;
nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz, total);