[PATCH 6.6 193/396] drm/bridge: lt8912b: do not return negative values from .get_modes()

Greg Kroah-Hartman
2024-04-01T16:45:20Z

From: Jani Nikula <jani.nikula@intel.com>

[ Upstream commit 171b711b26cce208bb628526b1b368aeec7b6fa4 ]

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/dcdddcbcb64b6f6cdc55022ee50c10dee8ddbc3d.1709913674.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 f0ebd56b4736a..e5839c89a355a 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -430,23 +430,21 @@ 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;
--
2.43.0