linux-kernel - [PATCH v3 0/2] remoteproc: k3-r5: Wait for core0 power-up before powering up core1

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Date: Tue, 30 Apr 2024 16:23:05 +0530
From: Beleswar Padhi <b-padhi@...com>
To: <andersson@...nel.org>
CC: <mathieu.poirier@...aro.org>, <s-anna@...com>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <u-kumar1@...com>, <nm@...com>, <devarsht@...com>, <hnagalla@...com>
Subject: [PATCH v3 0/2] remoteproc: k3-r5: Wait for core0 power-up before powering up core1

PSC controller has a limitation that it can only power-up the second core
when the first core is in ON state. Power-state for core0 should be equal
to or higher than core1, else the kernel is seen hanging during rproc
loading.

Make the powering up of cores sequential, by waiting for the current core
to power-up before proceeding to the next core, with a timeout of 2sec.
Add a wait queue event in k3_r5_cluster_rproc_init call, that will wait
for the current core to be released from reset before proceeding with the
next core.

Also, ensure that core1 can not be powered on before core0 when starting
cores from sysfs. Similarly, ensure that core0 can not be shutdown
before core1 from sysfs.

v3: Changelog:
1) Added my own Signed-off-by in PATCH 1, specifying the changes done
2) Addressed changes requested by adding comments in code in PATCH 1

Link to v2:
https://lore.kernel.org/all/20240424130504.494916-1-b-padhi@ti.com/

v2: Changelog:
1) Fixed multi-line comment format
2) Included root cause of bug in comments
3) Added a patch to ensure power-up/shutdown is sequential via sysfs

Link to v1:
https://lore.kernel.org/all/20230906124756.3480579-1-a-nandan@ti.com/

Apurva Nandan (1):
  remoteproc: k3-r5: Wait for core0 power-up before powering up core1

Beleswar Padhi (1):
  remoteproc: k3-r5: Do not allow core1 to power up before core0 via
    sysfs

 drivers/remoteproc/ti_k3_r5_remoteproc.c | 56 +++++++++++++++++++++++-
 1 file changed, 54 insertions(+), 2 deletions(-)

-- 
2.34.1