This is a note to let you know that I've just added the patch titled
drm/bridge: it6505: Check power state with it6505->powered in IRQ handler
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-bridge-it6505-check-power-state-with-it6505-powered-in-irq-handler.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 e9d699af3f65d62cf195f0e7a039400093ab2af2 Mon Sep 17 00:00:00 2001
From: Pin-yen Lin <treapking@xxxxxxxxxxxx>
Date: Thu, 27 Jul 2023 18:01:10 +0800
Subject: drm/bridge: it6505: Check power state with it6505->powered in IRQ handler
From: Pin-yen Lin <treapking@xxxxxxxxxxxx>
commit e9d699af3f65d62cf195f0e7a039400093ab2af2 upstream.
On system resume, the driver might call it6505_poweron directly if the
runtime PM hasn't been enabled. In such case, pm_runtime_get_if_in_use
will always return 0 because dev->power.runtime_status stays at
RPM_SUSPENDED, and the IRQ will never be handled.
Use it6505->powered from the driver struct fixes this because it always
gets updated when it6505_poweron is called.
Fixes: 5eb9a4314053 ("drm/bridge: it6505: Guard bridge power in IRQ handler")
Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx>
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230727100131.2338127-1-treapking@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/ite-it6505.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 504d51c42f79..aadb396508c5 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2517,9 +2517,11 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
};
int int_status[3], i;
- if (it6505->enable_drv_hold || pm_runtime_get_if_in_use(dev) <= 0)
+ if (it6505->enable_drv_hold || !it6505->powered)
return IRQ_HANDLED;
+ pm_runtime_get_sync(dev);
+
int_status[0] = it6505_read(it6505, INT_STATUS_01);
int_status[1] = it6505_read(it6505, INT_STATUS_02);
int_status[2] = it6505_read(it6505, INT_STATUS_03);
--
2.41.0
Patches currently in stable-queue which might be from treapking@xxxxxxxxxxxx are
queue-6.4/drm-bridge-it6505-check-power-state-with-it6505-powered-in-irq-handler.patch
