From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Patrik Flykt <patrik.flykt@linux.intel.com>, linux-can@vger.kernel.org
Cc: wg@grandegger.com, dmurphy@ti.com, sriram.dash@samsung.com,
jarkko.nikula@intel.com
Subject: Re: [PATCH 1/1] NET: mcan: Move runtime PM enable/disable to m_can_platform
Date: Mon, 19 Oct 2020 17:47:22 +0200 [thread overview]
Message-ID: <078d9bcd-cff5-12e6-22f4-0fb225b86b5e@pengutronix.de> (raw)
In-Reply-To: <20200825101736.158578-2-patrik.flykt@linux.intel.com>
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On 8/25/20 12:17 PM, Patrik Flykt wrote:
> This is a preparatory patch for upcoming PCI based M_CAN devices.
> The current PM implementation would cause PCI based drivers to
> enable PM twice, once when the pci device is added and a second
> time in m_can_class_register(). This will cause 'Unbalanced
> pm_runtime_enable!' to be logged, and is a situation that should
> be avoided.
>
> Therefore, in anticipation of PCI devices, move PM enabling out
> from M_CAN class registration to its currently only user, the
> m_can_platform driver.
Makes sense.
> Signed-off-by: Patrik Flykt <patrik.flykt@linux.intel.com>
Please rebase this patch onto linux-can/m_can
https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git/log/?h=m_can
> ---
> drivers/net/can/m_can/m_can.c | 6 +-----
> drivers/net/can/m_can/m_can_platform.c | 3 +++
> 2 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index 02c5795b7393..2c4d74113443 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -1817,7 +1817,6 @@ int m_can_class_register(struct m_can_classdev *m_can_dev)
> int ret;
>
> if (m_can_dev->pm_clock_support) {
I think pm_clock_support can be removed altogether now.
> - pm_runtime_enable(m_can_dev->dev);
> ret = m_can_clk_start(m_can_dev);
> if (ret)
> goto pm_runtime_fail;
> @@ -1847,11 +1846,8 @@ int m_can_class_register(struct m_can_classdev *m_can_dev)
> clk_disable:
> m_can_clk_stop(m_can_dev);
> pm_runtime_fail:
> - if (ret) {
> - if (m_can_dev->pm_clock_support)
> - pm_runtime_disable(m_can_dev->dev);
> + if (ret)
> free_candev(m_can_dev->net);
> - }
>
> return ret;
> }
> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
> index 38ea5e600fb8..1260e99b9322 100644
> --- a/drivers/net/can/m_can/m_can_platform.c
> +++ b/drivers/net/can/m_can/m_can_platform.c
> @@ -111,7 +111,10 @@ static int m_can_plat_probe(struct platform_device *pdev)
>
> m_can_init_ram(mcan_class);
>
> + pm_runtime_enable(mcan_class->dev);
> ret = m_can_class_register(mcan_class);
> + if (ret)
> + pm_runtime_disable(mcan_class->dev);
>
> failed_ret:
> return ret;
>
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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next prev parent reply other threads:[~2020-10-19 15:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 10:17 [PATCH 0/1] NET: mcan: Move runtime PM enable/disable to m_can_platform Patrik Flykt
2020-08-25 10:17 ` [PATCH 1/1] " Patrik Flykt
2020-09-01 18:22 ` Dan Murphy
2020-10-19 15:01 ` Patrik Flykt
2020-10-19 15:47 ` Marc Kleine-Budde [this message]
2020-10-23 11:58 ` Patrik Flykt
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