linux-kernel - [PATCH 0/4] remoteproc: k3-r5: Introduce suspend to ram support

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Date: Fri, 21 Jun 2024 17:00:54 +0200
From: Richard Genoud <richard.genoud@...tlin.com>
To: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>,
	Suman Anna <s-anna@...com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Udit Kumar <u-kumar1@...com>,
	Thomas Richard <thomas.richard@...tlin.com>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Hari Nagalla <hnagalla@...com>,
	Théo Lebrun <theo.lebrun@...tlin.com>,
	linux-remoteproc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Richard Genoud <richard.genoud@...tlin.com>
Subject: [PATCH 0/4] remoteproc: k3-r5: Introduce suspend to ram support

This series enables the suspend to ram with R5F remote processors on TI K3
platform.

The 1st patch is actually a fix, independent from the others

The 2nd patch introduces the suspend/resume handlers.
On suspend, the running rprocs will be stopped (or detached) and then
re-loaded in resume.
The logic behind this is:
 - shutdown the cores that Linux started to save power in suspend.
 - detach the cores that were started before Linux.

Then, the 3rd and 4th patches introduce the graceful shutdown of remote
procs. This will give them a chance to release resources and shut down
in a civilized manner.

Without this series, the suspend fails with:

omap-mailbox 31f81000.mailbox: fifo 1 has unexpected unread messages
omap-mailbox 31f81000.mailbox: PM: dpm_run_callback(): platform_pm_suspend returns -16
omap-mailbox 31f81000.mailbox: PM: platform_pm_suspend returned -16 after 16328 usecs
omap-mailbox 31f81000.mailbox: PM: failed to suspend: error -16

Patches 2 and 4 are based on work from Hari Nagalla <hnagalla@...com>.

@Hari, please feel free to add your Co-developed-by:/Signed-off-by:

Tested on J7200X SoM
Series is based on v6.10-rc4

Richard Genoud (4):
  remoteproc: k3-r5: Fix IPC-only mode detection
  remoteproc: k3-r5: Introduce PM suspend/resume handlers
  remoteproc: k3-r5: k3_r5_rproc_stop: code reorder
  remoteproc: k3-r5: support for graceful stop of remote cores

 drivers/remoteproc/omap_remoteproc.h     |   9 +-
 drivers/remoteproc/ti_k3_r5_remoteproc.c | 196 +++++++++++++++++++++--
 2 files changed, 188 insertions(+), 17 deletions(-)