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drm/bridge: stm_lvds: Do not fail atomic_check on disabled connector

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If the connector is disabled, the new connector state has .crtc field
set to NULL and there is nothing more to validate after that point.
The .crtc field being NULL is not an error. Test for .crtc being NULL,
and if it is NULL, exit early with return 0.

This fixes a failure in suspend/resume path, where the connector is
already disabled, but .atomic_check is called, fails, returns -EINVAL
and blocks the suspend entry.

Fixes: aca1cbc1c9 ("drm/stm: lvds: add new STM32 LVDS Display Interface Transmitter driver")
Signed-off-by: Marek Vasut <marex@nabladev.com>
Acked-by: Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com>
Link: https://patch.msgid.link/20260409024928.344010-1-marex@nabladev.com
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
This commit is contained in:
Marek Vasut
2026-04-09 04:48:41 +02:00
committed by Raphael Gallais-Pou
parent 79ae8510b5
commit eecdd4bd6e
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/stm/lvds.c
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@@ -897,14 +897,14 @@ static int lvds_connector_atomic_check(struct drm_connector *connector,
if (!conn_state)
return -EINVAL;
if (!conn_state->crtc)
return 0;
if (list_empty(&connector->modes)) {
drm_dbg(connector->dev, "connector: empty modes list\n");
return -EINVAL;
}
if (!conn_state->crtc)
return -EINVAL;
panel_mode = list_first_entry(&connector->modes,
struct drm_display_mode, head);