From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Saravana Kannan <saravanak@google.com>
Cc: Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
geert+renesas@glider.be, gregkh@linuxfoundation.org,
grygorii.strashko@ti.com, linux-omap@vger.kernel.org,
linux-pm@vger.kernel.org, peter.ujfalusi@ti.com,
rjw@rjwysocki.net, tomi.valkeinen@ti.com, tony@atomide.com,
ulf.hansson@linaro.org, kernel-team@android.com,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1] of: platform: Batch fwnode parsing in the init_machine() path
Date: Fri, 2 Oct 2020 02:19:22 +0300 [thread overview]
Message-ID: <20201001231922.GG3722@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20201001225952.3676755-1-saravanak@google.com>
Hi Saravana,
Thank you for the patch.
On Thu, Oct 01, 2020 at 03:59:51PM -0700, Saravana Kannan wrote:
> When commit 93d2e4322aa7 ("of: platform: Batch fwnode parsing when
> adding all top level devices") optimized the fwnode parsing when all top
> level devices are added, it missed out optimizing this for platform
> where the top level devices are added through the init_machine() path.
>
> This commit does the optimization for all paths by simply moving the
> fw_devlink_pause/resume() inside of_platform_default_populate().
Based on v5.9-rc5, before the patch:
[ 0.652887] cpuidle: using governor menu
[ 12.349476] No ATAGs?
After the patch:
[ 0.650460] cpuidle: using governor menu
[ 12.262101] No ATAGs?
:-(
> Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> ---
> drivers/of/platform.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index 071f04da32c8..79972e49b539 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -501,8 +501,21 @@ int of_platform_default_populate(struct device_node *root,
> const struct of_dev_auxdata *lookup,
> struct device *parent)
> {
> - return of_platform_populate(root, of_default_bus_match_table, lookup,
> - parent);
> + int ret;
> +
> + /*
> + * fw_devlink_pause/resume() are only safe to be called around top
> + * level device addition due to locking constraints.
> + */
> + if (!root)
> + fw_devlink_pause();
> +
> + ret = of_platform_populate(root, of_default_bus_match_table, lookup,
> + parent);
> +
> + if (!root)
> + fw_devlink_resume();
> + return ret;
> }
> EXPORT_SYMBOL_GPL(of_platform_default_populate);
>
> @@ -538,9 +551,7 @@ static int __init of_platform_default_populate_init(void)
> }
>
> /* Populate everything else. */
> - fw_devlink_pause();
> of_platform_default_populate(NULL, NULL, NULL);
> - fw_devlink_resume();
>
> return 0;
> }
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2020-10-01 23:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 15:25 Slow booting on x15 Tomi Valkeinen
2020-09-18 15:58 ` Laurent Pinchart
2020-09-23 7:07 ` Tony Lindgren
2020-09-23 11:13 ` Laurent Pinchart
2020-09-24 5:42 ` Tony Lindgren
2020-09-24 5:53 ` Tony Lindgren
2020-09-24 6:04 ` Tomi Valkeinen
2020-09-24 6:08 ` Tony Lindgren
2020-09-24 13:30 ` Laurent Pinchart
2020-09-25 11:51 ` Tony Lindgren
2020-09-25 11:58 ` Laurent Pinchart
2020-09-30 5:20 ` Tony Lindgren
2020-09-30 12:41 ` Peter Ujfalusi
2020-10-01 7:53 ` Tony Lindgren
2020-10-01 8:17 ` Tony Lindgren
2020-10-01 8:22 ` Laurent Pinchart
2020-10-01 12:56 ` Grygorii Strashko
2020-10-01 13:11 ` Geert Uytterhoeven
2020-10-01 13:49 ` Grygorii Strashko
2020-10-01 18:24 ` Saravana Kannan
2020-10-01 19:43 ` Grygorii Strashko
2020-10-01 22:22 ` Saravana Kannan
2020-10-01 22:30 ` Saravana Kannan
2020-10-01 22:38 ` Laurent Pinchart
2020-10-01 22:44 ` Saravana Kannan
2020-10-01 22:59 ` [PATCH v1] of: platform: Batch fwnode parsing in the init_machine() path Saravana Kannan
2020-10-01 23:19 ` Laurent Pinchart [this message]
2020-10-02 11:40 ` Grygorii Strashko
2020-10-02 15:03 ` Grygorii Strashko
2020-10-02 17:48 ` Saravana Kannan
2020-10-02 18:11 ` Grygorii Strashko
2020-10-02 14:07 ` Rob Herring
2020-10-02 17:51 ` Saravana Kannan
2020-10-02 17:54 ` Laurent Pinchart
2020-10-02 17:58 ` Saravana Kannan
2020-10-02 18:27 ` Laurent Pinchart
2020-10-02 18:35 ` Grygorii Strashko
2020-10-02 19:56 ` Saravana Kannan
2020-10-03 0:13 ` Laurent Pinchart
2020-10-27 3:29 ` Saravana Kannan
2020-10-28 7:34 ` Tomi Valkeinen
2020-10-02 20:29 ` Rob Herring
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