From a29997b7ac1f5c816b543e0c56aa2b5b56baac24 Mon Sep 17 00:00:00 2001
From: Dillon Varone <dillon.varone@amd.com>
Date: Wed, 13 Nov 2024 16:44:15 -0500
Subject: drm/amd/display: Limit VTotal range to max hw cap minus fp
[WHY & HOW]
Hardware does not support the VTotal to be between fp2 lines of the
maximum possible VTotal, so add a capability flag to track it and apply
where necessary.
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jun Lei <jun.lei@amd.com>
Reviewed-by: Anthony Koo <anthony.koo@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
(limited to 'drivers/gpu/drm/amd/display/modules/freesync/freesync.c')
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index f980a84dceef..2b3964529539 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -122,6 +122,17 @@ static unsigned int calc_duration_in_us_from_v_total(
return duration_in_us;
}
+static unsigned int calc_max_hardware_v_total(const struct dc_stream_state *stream)
+{
+ unsigned int max_hw_v_total = stream->ctx->dc->caps.max_v_total;
+
+ if (stream->ctx->dc->caps.vtotal_limited_by_fp2) {
+ max_hw_v_total -= stream->timing.v_front_porch + 1;
+ }
+
+ return max_hw_v_total;
+}
+
unsigned int mod_freesync_calc_v_total_from_refresh(
const struct dc_stream_state *stream,
unsigned int refresh_in_uhz)
@@ -1016,7 +1027,7 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
if (stream->ctx->dc->caps.max_v_total != 0 && stream->timing.h_total != 0) {
min_hardware_refresh_in_uhz = div64_u64((stream->timing.pix_clk_100hz * 100000000ULL),
- (stream->timing.h_total * (long long)stream->ctx->dc->caps.max_v_total));
+ (stream->timing.h_total * (long long)calc_max_hardware_v_total(stream)));
}
/* Limit minimum refresh rate to what can be supported by hardware */
min_refresh_in_uhz = min_hardware_refresh_in_uhz > in_config->min_refresh_in_uhz ?
--
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