This is a note to let you know that I've just added the patch titled
drm/i915: Fix HPD polling, reenabling the output poll work as needed
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-fix-hpd-polling-reenabling-the-output-poll-work-as-needed.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1dcc437427bbcebc8381226352f7ade08a271191 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@xxxxxxxxx>
Date: Tue, 22 Aug 2023 14:30:15 +0300
Subject: drm/i915: Fix HPD polling, reenabling the output poll work as needed
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From: Imre Deak <imre.deak@xxxxxxxxx>
commit 1dcc437427bbcebc8381226352f7ade08a271191 upstream.
After the commit in the Fixes: line below, HPD polling stopped working
on i915, since after that change calling drm_kms_helper_poll_enable()
doesn't restart drm_mode_config::output_poll_work if the work was
stopped (no connectors needing polling) and enabling polling for a
connector (during runtime suspend or detecting an HPD IRQ storm).
After the above change calling drm_kms_helper_poll_enable() is a nop
after it's been called already and polling for some connectors was
disabled/re-enabled.
Fix this by calling drm_kms_helper_poll_reschedule() added in the
previous patch instead, which reschedules the work whenever expected.
Fixes: d33a54e3991d ("drm/probe_helper: sort out poll_running vs poll_enabled")
CC: stable@xxxxxxxxxxxxxxx # 6.4+
Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230822113015.41224-2-imre.deak@xxxxxxxxx
(cherry picked from commit 50452f2f76852322620b63e62922b85e955abe94)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_hotplug.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
@@ -210,7 +210,7 @@ intel_hpd_irq_storm_switch_to_polling(st
/* Enable polling and queue hotplug re-enabling. */
if (hpd_disabled) {
- drm_kms_helper_poll_enable(&dev_priv->drm);
+ drm_kms_helper_poll_reschedule(&dev_priv->drm);
mod_delayed_work(system_wq, &dev_priv->display.hotplug.reenable_work,
msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
}
@@ -644,7 +644,7 @@ static void i915_hpd_poll_init_work(stru
drm_connector_list_iter_end(&conn_iter);
if (enabled)
- drm_kms_helper_poll_enable(&dev_priv->drm);
+ drm_kms_helper_poll_reschedule(&dev_priv->drm);
mutex_unlock(&dev_priv->drm.mode_config.mutex);
Patches currently in stable-queue which might be from imre.deak@xxxxxxxxx are
queue-6.4/drm-i915-fix-hpd-polling-reenabling-the-output-poll-work-as-needed.patch
queue-6.4/drm-add-an-hpd-poll-helper-to-reschedule-the-poll-work.patch
