linux-kernel - [PATCH V2 0/2] remoteproc: imx: add start up delay

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Date:   Wed,  2 Nov 2022 19:24:49 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     andersson@...nel.org, mathieu.poirier@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH V2 0/2] remoteproc: imx: add start up delay

From: Peng Fan <peng.fan@....com>

V2:
 Rebased on linux-next

V1:
 https://lore.kernel.org/lkml/20220609123500.3492475-1-peng.fan@oss.nxp.com/

There is case that after remoteproc start remote processor[M4], the M4
runs slow and before M4 finish its own rpmsg framework initialization,
linux sends out vring kick message, then M4 firmware drops the kick
message. Some NXP released Cortex-M[x] images has such limitation that
it requires linux sends out vring kick message after M4 firmware finish
its rpmsg framework initialization.

The best case is to use a method to let M4 notify Linux that M4 has
finished initialization, but we could not patch released firmware,
then update driver to detect notification.

So add delay before linux send out vring kick message. It is not good to
use a fixed time delay in driver, so I choose to get that from device
tree.

Peng Fan (2):
  dt-bindings: remoteproc: imx_rproc: add fsl,startup-delay-ms
  remoteproc: imx_rproc: delay after kick remote processor

 .../devicetree/bindings/remoteproc/fsl,imx-rproc.yaml    | 4 ++++
 drivers/remoteproc/imx_rproc.c                           | 9 +++++++++
 2 files changed, 13 insertions(+)

-- 
2.37.1