linux-kernel - [PATCH v2 0/3] Defer TI's Remoteproc's Probe until Mailbox is Probed

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Date: Tue, 4 Jun 2024 10:47:19 +0530
From: Beleswar Padhi <b-padhi@...com>
To: <andersson@...nel.org>, <mathieu.poirier@...aro.org>
CC: <hnagalla@...com>, <u-kumar1@...com>, <afd@...com>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 0/3] Defer TI's Remoteproc's Probe until Mailbox is Probed

Hello All,

This series adds deferred probe functionality in the TI's Remoteproc
drivers. The remoteproc drivers are dependent on the omap-mailbox driver
for mbox functionalities. Sometimes, the remoteproc driver could be
probed before the mailbox driver leading to rproc boot failures. Thus,
defer the probe routine of remoteproc drivers until mailbox driver is
probed by checking the mbox_request_channel handle in probe. 

Also, use the acquired mbox handle in probe during rproc start/attach
routine instead of re-requesting. Do not free mbox handle during
stop/detach routine or error paths. This makes our k3_rproc_attach() &
k3_rproc_detach() functions NOP.

Also, use the devm_rproc_alloc() helper to automatically free created
rprocs incase of a probe defer.

v2: Changelog:
1) Added a check in k3_mbox_callback() to prevent forwarding messages to
a detached core.
2) Addressed Andrew's comments in v1 regarding some cleanup (Using
dev_err_probe, removing unused labels, adding matching mbox_free_channel
call during device removal).

Link to v1:
https://lore.kernel.org/all/20240530090737.655054-1-b-padhi@ti.com/

Beleswar Padhi (3):
  remoteproc: k3-r5: Use devm_rproc_alloc() helper
  remoteproc: k3-r5: Acquire mailbox handle during probe
  remoteproc: k3-dsp: Acquire mailbox handle during probe routine

 drivers/remoteproc/ti_k3_dsp_remoteproc.c | 76 ++++++++-------------
 drivers/remoteproc/ti_k3_r5_remoteproc.c  | 80 ++++++++---------------
 2 files changed, 54 insertions(+), 102 deletions(-)

-- 
2.34.1