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Message-ID: <20251204152403.256c135a@canb.auug.org.au>
Date: Thu, 4 Dec 2025 15:24:03 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Dave Airlie <airlied@...hat.com>, Alex Deucher <alexdeucher@...il.com>
Cc: Alex Deucher <alexander.deucher@....com>, Ivan Lipski
<ivan.lipski@....com>, DRI <dri-devel@...ts.freedesktop.org>, Linux Kernel
Mailing List <linux-kernel@...r.kernel.org>, Linux Next Mailing List
<linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the drm tree
Hi all,
After merging the drm tree, today's linux-next build (x86_64 allmodconfig)
failed like this:
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4026:13: error: redefinition of 'are_sinks_equal'
4026 | static bool are_sinks_equal(const struct dc_sink *sink1, const struct dc_sink *sink2)
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3935:13: note: previous definition of 'are_sinks_equal' with type 'bool(const struct dc_sink *, const struct dc_sink *)' {aka '_Bool(const struct dc_sink *, const struct dc_sink *)'}
3935 | static bool are_sinks_equal(const struct dc_sink *sink1, const struct dc_sink *sink2)
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4058:13: error: redefinition of 'hdmi_hpd_debounce_work'
4058 | static void hdmi_hpd_debounce_work(struct work_struct *work)
| ^~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3967:13: note: previous definition of 'hdmi_hpd_debounce_work' with type 'void(struct work_struct *)'
3967 | static void hdmi_hpd_debounce_work(struct work_struct *work)
| ^~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3967:13: error: 'hdmi_hpd_debounce_work' defined but not used [-Werror=unused-function]
cc1: all warnings being treated as errors
Caused by commit
c918e75e1ed9 ("drm/amd/display: Add an HPD filter for HDMI")
merging badly with commit
c97da4785b3b ("drm/amd/display: Add an HPD filter for HDMI")
from Linus' tree :-(
I have applied the following merge fix patch for tosay.
From 1be223e7e9978a416cbdb835ea283da95abf7b58 Mon Sep 17 00:00:00 2001
From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 4 Dec 2025 14:43:35 +1100
Subject: [PATCH] fix up for duplicate commit "drm/amd/display: Add an HPD
filter for HDMI"
merging badly
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 91 -------------------
1 file changed, 91 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8b43d49dffcd..740711ac1037 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3949,97 +3949,6 @@ static bool are_sinks_equal(const struct dc_sink *sink1, const struct dc_sink *s
}
-/**
- * DOC: hdmi_hpd_debounce_work
- *
- * HDMI HPD debounce delay in milliseconds. When an HDMI display toggles HPD
- * (such as during power save transitions), this delay determines how long to
- * wait before processing the HPD event. This allows distinguishing between a
- * physical unplug (>hdmi_hpd_debounce_delay)
- * and a spontaneous RX HPD toggle (<hdmi_hpd_debounce_delay).
- *
- * If the toggle is less than this delay, the driver compares sink capabilities
- * and permits a hotplug event if they changed.
- *
- * The default value of 1500ms was chosen based on experimental testing with
- * various monitors that exhibit spontaneous HPD toggling behavior.
- */
-static void hdmi_hpd_debounce_work(struct work_struct *work)
-{
- struct amdgpu_dm_connector *aconnector =
- container_of(to_delayed_work(work), struct amdgpu_dm_connector,
- hdmi_hpd_debounce_work);
- struct drm_connector *connector = &aconnector->base;
- struct drm_device *dev = connector->dev;
- struct amdgpu_device *adev = drm_to_adev(dev);
- struct dc *dc = aconnector->dc_link->ctx->dc;
- bool fake_reconnect = false;
- bool reallow_idle = false;
- bool ret = false;
- guard(mutex)(&aconnector->hpd_lock);
-
- /* Re-detect the display */
- scoped_guard(mutex, &adev->dm.dc_lock) {
- if (dc->caps.ips_support && dc->ctx->dmub_srv->idle_allowed) {
- dc_allow_idle_optimizations(dc, false);
- reallow_idle = true;
- }
- ret = dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
- }
-
- if (ret) {
- /* Apply workaround delay for certain panels */
- apply_delay_after_dpcd_poweroff(adev, aconnector->dc_sink);
- /* Compare sinks to determine if this was a spontaneous HPD toggle */
- if (are_sinks_equal(aconnector->dc_link->local_sink, aconnector->hdmi_prev_sink)) {
- /*
- * Sinks match - this was a spontaneous HDMI HPD toggle.
- */
- drm_dbg_kms(dev, "HDMI HPD: Sink unchanged after debounce, internal re-enable\n");
- fake_reconnect = true;
- }
-
- /* Update connector state */
- amdgpu_dm_update_connector_after_detect(aconnector);
-
- drm_modeset_lock_all(dev);
- dm_restore_drm_connector_state(dev, connector);
- drm_modeset_unlock_all(dev);
-
- /* Only notify OS if sink actually changed */
- if (!fake_reconnect && aconnector->base.force == DRM_FORCE_UNSPECIFIED)
- drm_kms_helper_hotplug_event(dev);
- }
-
- /* Release the cached sink reference */
- if (aconnector->hdmi_prev_sink) {
- dc_sink_release(aconnector->hdmi_prev_sink);
- aconnector->hdmi_prev_sink = NULL;
- }
-
- scoped_guard(mutex, &adev->dm.dc_lock) {
- if (reallow_idle && dc->caps.ips_support)
- dc_allow_idle_optimizations(dc, true);
- }
-}
-
-static bool are_sinks_equal(const struct dc_sink *sink1, const struct dc_sink *sink2)
-{
- if (!sink1 || !sink2)
- return false;
- if (sink1->sink_signal != sink2->sink_signal)
- return false;
-
- if (sink1->dc_edid.length != sink2->dc_edid.length)
- return false;
-
- if (memcmp(sink1->dc_edid.raw_edid, sink2->dc_edid.raw_edid,
- sink1->dc_edid.length) != 0)
- return false;
- return true;
-}
-
-
/**
* DOC: hdmi_hpd_debounce_work
*
--
2.52.0
--
Cheers,
Stephen Rothwell
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