From: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
To: Bjorn Andersson <andersson@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Daniel Baluta <daniel.baluta@nxp.com>,
Iuliana Prodan <iuliana.prodan@nxp.com>,
Marek Vasut <marex@denx.de>
Cc: linux-remoteproc@vger.kernel.org, imx@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Peng Fan <peng.fan@nxp.com>
Subject: [PATCH v3 0/2] remoteproc: imx_rproc: support non-blocking tx for i.MX7ULP
Date: Thu, 22 Aug 2024 21:48:48 +0800 [thread overview]
Message-ID: <20240822-imx_rproc-v3-0-6d943723945d@nxp.com> (raw)
The i.MX7ULP Cortex-A7 is under control of Cortex-M4. The i.MX7ULP Linux
poweroff and restart rely on rpmsg driver to send a message to Cortex-M4
firmware. Then Cortex-A7 could poweroff or restart by Cortex-M4 to
configure the i.MX7ULP power controller properly.
However the reboot and restart kernel common code use atomic notifier,
see kernel/reboot.c: do_kernel_power_off, do_kernel_restart.
Linux 'poweroff' cmd will trigger kernel 'do_kernel_power_off'
Linux 'reboot' cmd will trigger kernel 'do_kernel_restart'.
Power off and restart are totally different operations and are not
complementary. So need to make sure the mailbox be changed to non-blocking
mode in SYS_OFF_MODE_POWER_OFF_PREPARE and SYS_OFF_MODE_RESTART_PREPARE
stage. Otherwise with blocking tx mailbox, there will be kernel dump,
because of blocking mailbox will use wait_for_completion_timeout. In the
poweroff or restart case, there is no need to wait, because after M4 got
the message, M4 will put A7 to reboot or poweroff.
patch 1 is to support non-blocking tx mailbox channel
patch 2 is to switch to non-blocking tx for system poweroff or restart.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
Changes in v3:
- patch 2: Introduce an flags entry for dcfg and set IMX_RPROC_NEED_SYSTEM_OFF
for i.MX7ULP, drop used "struct sys_off_data data" and add comment(per Frank).
Drop R-b of patch 2 because of this change.
- Patch 1: commit log rewritten and R-b dropped.
(Thanks to Daniel).
- Update patch 2 commit log and cover-letter to clarify reboot and
poweroff are different operations and not complementary
(Thanks to Daniel).
- Link to v2: https://lore.kernel.org/r/20240719-imx_rproc-v2-0-cd8549aa3f1f@nxp.com
Changes in v2:
- Separated patch 5,6 from v1
- Update commit patch 1 with adding "No functional changes"
- Link to v1: https://lore.kernel.org/r/20240712-imx_rproc-v1-0-7bcf6732d328@nxp.com
---
Peng Fan (2):
remoteproc: imx_rproc: Allow setting of the mailbox transmit mode
remoteproc: imx_rproc: Add support for poweroff and reboot
drivers/remoteproc/imx_rproc.c | 54 +++++++++++++++++++++++++++++++++++++-----
drivers/remoteproc/imx_rproc.h | 4 ++++
2 files changed, 52 insertions(+), 6 deletions(-)
---
base-commit: 33a32de2d79c051f27ed57c4ac90cdb406f91928
change-id: 20240712-imx_rproc-25f3ab753c58
Best regards,
--
Peng Fan <peng.fan@nxp.com>
next reply other threads:[~2024-08-22 13:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-22 13:48 Peng Fan (OSS) [this message]
2024-08-22 13:48 ` [PATCH v3 1/2] remoteproc: imx_rproc: Allow setting of the mailbox transmit mode Peng Fan (OSS)
2024-08-23 8:11 ` Daniel Baluta
2024-08-22 13:48 ` [PATCH v3 2/2] remoteproc: imx_rproc: Add support for poweroff and reboot Peng Fan (OSS)
2024-08-23 8:12 ` Daniel Baluta
2024-08-26 15:31 ` [PATCH v3 0/2] remoteproc: imx_rproc: support non-blocking tx for i.MX7ULP Mathieu Poirier
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