linux-kernel - FAILED: Patch "drm/bridge: lt8912b: do not return negative values from .get_modes()" failed to apply to 5.15-stable tree

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Message-ID: <20240327121633.2832804-1-sashal@kernel.org>
Date: Wed, 27 Mar 2024 08:16:33 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	jani.nikula@...el.com
Cc: Adrien Grassein <adrien.grassein@...il.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "drm/bridge: lt8912b: do not return negative values from .get_modes()" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-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@...r.kernel.org>.

Thanks,
Sasha

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

>From 171b711b26cce208bb628526b1b368aeec7b6fa4 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@...el.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@...il.com>
Cc: stable@...r.kernel.org
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
Link: https://patchwork.freedesktop.org/patch/msgid/dcdddcbcb64b6f6cdc55022ee50c10dee8ddbc3d.1709913674.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@...el.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;
-- 
2.43.0