The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Thanks, Sasha

------------------ original commit in Linus's tree ------------------

From 171b711b26cce208bb628526b1b368aeec7b6fa4 Mon Sep 17 00:00:00 2001 From: Jani Nikula jani.nikula@intel.com Date: Fri, 8 Mar 2024 18:03:42 +0200 Subject: [PATCH] drm/bridge: lt8912b: do not return negative values from .get_modes()

The .get_modes() hooks aren't supposed to return negative error codes. Return 0 for no modes, whatever the reason.

Cc: Adrien Grassein adrien.grassein@gmail.com Cc: stable@vger.kernel.org Acked-by: Thomas Zimmermann tzimmermann@suse.de Link: https://patchwork.freedesktop.org/patch/msgid/dcdddcbcb64b6f6cdc55022ee50c10... Signed-off-by: Jani Nikula jani.nikula@intel.com --- drivers/gpu/drm/bridge/lontium-lt8912b.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c index e7c4bef74aa46..4b2ae27f0a57f 100644 --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c @@ -441,23 +441,21 @@ lt8912_connector_mode_valid(struct drm_connector *connector, static int lt8912_connector_get_modes(struct drm_connector *connector) { const struct drm_edid *drm_edid; - int ret = -1; - int num = 0; struct lt8912 *lt = connector_to_lt8912(connector); u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; + int ret, num;

drm_edid = drm_bridge_edid_read(lt->hdmi_port, connector); drm_edid_connector_update(connector, drm_edid); - if (drm_edid) { - num = drm_edid_connector_add_modes(connector); - } else { - return ret; - } + if (!drm_edid) + return 0; + + num = drm_edid_connector_add_modes(connector);

ret = drm_display_info_set_bus_formats(&connector->display_info, &bus_format, 1); - if (ret) - num = ret; + if (ret < 0) + num = 0;

drm_edid_free(drm_edid); return num;