This is a note to let you know that I've just added the patch titled
pmdomain: qcom: rpmhpd: Fix enabled_corner aggregation
to the 5.10-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:
pmdomain-qcom-rpmhpd-fix-enabled_corner-aggregation.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2a93c6cbd5a703d44c414a3c3945a87ce11430ba Mon Sep 17 00:00:00 2001
From: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
Date: Mon, 26 Feb 2024 17:49:57 -0800
Subject: pmdomain: qcom: rpmhpd: Fix enabled_corner aggregation
From: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
commit 2a93c6cbd5a703d44c414a3c3945a87ce11430ba upstream.
Commit 'e3e56c050ab6 ("soc: qcom: rpmhpd: Make power_on actually enable
the domain")' aimed to make sure that a power-domain that is being
enabled without any particular performance-state requested will at least
turn the rail on, to avoid filling DeviceTree with otherwise unnecessary
required-opps properties.
But in the event that aggregation happens on a disabled power-domain, with
an enabled peer without performance-state, both the local and peer
corner are 0. The peer's enabled_corner is not considered, with the
result that the underlying (shared) resource is disabled.
One case where this can be observed is when the display stack keeps mmcx
enabled (but without a particular performance-state vote) in order to
access registers and sync_state happens in the rpmhpd driver. As mmcx_ao
is flushed the state of the peer (mmcx) is not considered and mmcx_ao
ends up turning off "mmcx.lvl" underneath mmcx. This has been observed
several times, but has been painted over in DeviceTree by adding an
explicit vote for the lowest non-disabled performance-state.
Fixes: e3e56c050ab6 ("soc: qcom: rpmhpd: Make power_on actually enable the domain")
Reported-by: Johan Hovold <johan@xxxxxxxxxx>
Closes: https://lore.kernel.org/linux-arm-msm/ZdMwZa98L23mu3u6@xxxxxxxxxxxxxxxxxxxx/
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Tested-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240226-rpmhpd-enable-corner-fix-v1-1-68c004cec48c@xxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/soc/qcom/rpmhpd.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/soc/qcom/rpmhpd.c
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -261,12 +261,15 @@ static int rpmhpd_aggregate_corner(struc
unsigned int active_corner, sleep_corner;
unsigned int this_active_corner = 0, this_sleep_corner = 0;
unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
+ unsigned int peer_enabled_corner;
to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
- if (peer && peer->enabled)
- to_active_sleep(peer, peer->corner, &peer_active_corner,
+ if (peer && peer->enabled) {
+ peer_enabled_corner = max(peer->corner, peer->enable_corner);
+ to_active_sleep(peer, peer_enabled_corner, &peer_active_corner,
&peer_sleep_corner);
+ }
active_corner = max(this_active_corner, peer_active_corner);
Patches currently in stable-queue which might be from quic_bjorande@xxxxxxxxxxx are
queue-5.10/pmdomain-qcom-rpmhpd-fix-enabled_corner-aggregation.patch
