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drm: Check for margin caps and set underscan accordingly

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For now, we're going to use either margin or underscan properties to
set up a symmetrical underscan - that way we have feature parity no
matter which props the driver supports.

We can orthogonally expose the things margins can do that symmetrical
borders can't later with a centering offset option, if we want to.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2026-05-22 11:44:48 -05:00
parent 9b26c1ed09
commit 3f501df947
1 changed files with 38 additions and 1 deletions
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39
libweston/backend-drm/modes.c
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@ -490,6 +490,42 @@ drm_head_get_kms_colorimetry_modes(const struct drm_head *head)
return colorimetry_modes;
}
static bool
drm_head_get_margin_caps(const struct drm_head *head,
uint32_t *hborder_max,
uint32_t *vborder_max)
{
const struct drm_property_info *info;
uint32_t border = 0;
info = &head->connector.props[WDRM_CONNECTOR_LEFT_MARGIN];
if (info->prop_id == 0 || info->num_range_values != 2)
goto no_margins;
border = info->range_values[1];
info = &head->connector.props[WDRM_CONNECTOR_RIGHT_MARGIN];
if (info->prop_id == 0 || info->num_range_values != 2)
goto no_margins;
*hborder_max = MIN(border, info->range_values[1]);
info = &head->connector.props[WDRM_CONNECTOR_TOP_MARGIN];
if (info->prop_id == 0 || info->num_range_values != 2)
goto no_margins;
border = info->range_values[1];
info = &head->connector.props[WDRM_CONNECTOR_BOTTOM_MARGIN];
if (info->prop_id == 0 || info->num_range_values != 2)
goto no_margins;
*vborder_max = MIN(border, info->range_values[1]);
return true;
no_margins:
*hborder_max = 0;
*vborder_max = 0;
return false;
}
static void
drm_head_get_underscan_caps(const struct drm_head *head,
uint32_t *hborder_max_out,
@ -749,7 +785,8 @@ update_head_from_connector(struct drm_head *head)
vrr_mode_mask = WESTON_VRR_MODE_GAME;
weston_head_set_supported_vrr_modes_mask(&head->base, vrr_mode_mask);
drm_head_get_underscan_caps(head, &hborder_max, &vborder_max);
if (!drm_head_get_margin_caps(head, &hborder_max, &vborder_max))
drm_head_get_underscan_caps(head, &hborder_max, &vborder_max);
weston_head_set_supported_underscan(&head->base, hborder_max, vborder_max);
drm_head_info_fini(&dhi);