From: Sascha Hauer <sha@pengutronix.de>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Andrew Lunn <andrew@lunn.ch>,
Ulf Hansson <ulf.hansson@linaro.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Eric Dumazet <edumazet@google.com>, Pavel Machek <pavel@ucw.cz>,
Will Deacon <will@kernel.org>,
Saravana Kannan <saravanak@google.com>,
Kevin Hilman <khilman@kernel.org>, Joerg Roedel <joro@8bytes.org>,
Russell King <linux@armlinux.org.uk>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Android Kernel Team <kernel-team@android.com>,
Len Brown <len.brown@intel.com>,
Linux PM <linux-pm@vger.kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
David Ahern <dsahern@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
Sascha Hauer <kernel@pengutronix.de>,
netdev <netdev@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default
Date: Wed, 22 Jun 2022 13:18:33 +0200 [thread overview]
Message-ID: <20220622111833.GW1615@pengutronix.de> (raw)
In-Reply-To: <CAHp75VdqjCoWAHV4AyYrju0o8buREA8pM5wyf8TD=rCMTs-tEA@mail.gmail.com>
On Wed, Jun 22, 2022 at 12:52:02PM +0200, Andy Shevchenko wrote:
> On Wed, Jun 22, 2022 at 10:44 AM Linus Walleij <linus.walleij@linaro.org> wrote:
> > On Wed, Jun 22, 2022 at 9:48 AM Sascha Hauer <sha@pengutronix.de> wrote:
>
> ...
>
> > > This patch has the effect that console UART devices which have "dmas"
> > > properties specified in the device tree get deferred for 10 to 20
> > > seconds. This happens on i.MX and likely on other SoCs as well. On i.MX
> > > the dma channel is only requested at UART startup time and not at probe
> > > time. dma is not used for the console. Nevertheless with this driver probe
> > > defers until the dma engine driver is available.
> > >
> > > It shouldn't go in as-is.
> >
> > This affects all machines with the PL011 UART and DMAs specified as
> > well.
> >
> > It would be best if the console subsystem could be treated special and
> > not require DMA devlink to be satisfied before probing.
>
> In 8250 we force disable DMA and PM on kernel consoles, because it's
> so-o PITA and has a lot of corner cases we may never chase down.
On i.MX this is done as well, but it doesn't help here. The driver is
not even probed when the device node contains a "dmas" property.
Sascha
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next prev parent reply other threads:[~2022-06-22 11:21 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-01 7:06 [PATCH v2 0/9] deferred_probe_timeout logic clean up Saravana Kannan
2022-06-01 7:06 ` [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state() Saravana Kannan
2022-06-09 11:44 ` Ulf Hansson
2022-06-09 19:29 ` Saravana Kannan
2022-06-21 7:28 ` Tony Lindgren
2022-06-21 19:34 ` Saravana Kannan
2022-06-22 4:58 ` Tony Lindgren
2022-06-22 19:09 ` Saravana Kannan
2022-06-23 7:01 ` Tony Lindgren
2022-06-23 8:21 ` Saravana Kannan
2022-06-27 9:10 ` Tony Lindgren
2022-06-30 23:10 ` Saravana Kannan
2022-06-30 23:26 ` Rob Herring
2022-06-30 23:30 ` Saravana Kannan
2022-07-01 5:33 ` Tony Lindgren
2022-07-01 6:12 ` Tony Lindgren
2022-07-01 8:10 ` Saravana Kannan
2022-07-01 8:26 ` Saravana Kannan
2022-07-01 13:00 ` Tony Lindgren
2022-07-12 7:12 ` Tony Lindgren
2022-07-13 0:49 ` Saravana Kannan
2022-07-13 8:06 ` Tony Lindgren
2022-07-01 15:08 ` Sudeep Holla
2022-07-01 19:13 ` Saravana Kannan
2022-07-05 8:44 ` Saravana Kannan
2022-07-01 7:38 ` Geert Uytterhoeven
2022-06-23 12:08 ` Alexander Stein
2022-07-01 0:37 ` Saravana Kannan
2022-07-01 6:01 ` (EXT) " Alexander Stein
2022-07-01 7:02 ` Saravana Kannan
2022-07-04 7:07 ` (EXT) " Alexander Stein
2022-07-05 1:24 ` Saravana Kannan
2022-07-06 13:02 ` Re: " Alexander Stein
2022-07-13 0:45 ` Saravana Kannan
2022-07-14 6:41 ` Alexander Stein
2022-07-15 22:08 ` Saravana Kannan
2022-07-01 7:30 ` Geert Uytterhoeven
2022-06-01 7:06 ` [PATCH v2 2/9] pinctrl: devicetree: " Saravana Kannan
2022-06-01 7:06 ` [PATCH v2 3/9] net: mdio: " Saravana Kannan
2022-07-05 9:11 ` Geert Uytterhoeven
2022-07-13 1:40 ` Saravana Kannan
2022-07-13 11:39 ` Geert Uytterhoeven
2022-08-15 8:38 ` Geert Uytterhoeven
2022-06-01 7:07 ` [PATCH v2 4/9] driver core: Add wait_for_init_devices_probe helper function Saravana Kannan
2022-06-01 7:07 ` [PATCH v2 5/9] net: ipconfig: Relax fw_devlink if we need to mount a network rootfs Saravana Kannan
2022-06-01 7:07 ` [PATCH v2 6/9] Revert "driver core: Set default deferred_probe_timeout back to 0." Saravana Kannan
2022-07-20 17:31 ` Geert Uytterhoeven
2022-07-20 19:01 ` Saravana Kannan
2022-07-21 8:40 ` Geert Uytterhoeven
2022-06-01 7:07 ` [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default Saravana Kannan
2022-06-22 7:47 ` Sascha Hauer
2022-06-22 8:44 ` Linus Walleij
2022-06-22 10:52 ` Andy Shevchenko
2022-06-22 11:18 ` Sascha Hauer [this message]
2022-06-22 19:40 ` Saravana Kannan
2022-06-22 20:35 ` Saravana Kannan
2022-06-22 22:30 ` Saravana Kannan
2022-06-28 13:09 ` Linus Walleij
2022-06-01 7:07 ` [PATCH v2 8/9] iommu/of: Delete usage of driver_deferred_probe_check_state() Saravana Kannan
2022-06-01 7:07 ` [PATCH v2 9/9] driver core: Delete driver_deferred_probe_check_state() Saravana Kannan
2022-06-07 18:07 ` [PATCH v2 0/9] deferred_probe_timeout logic clean up Geert Uytterhoeven
2022-06-08 0:55 ` Saravana Kannan
2022-06-08 4:17 ` Saravana Kannan
2022-06-08 10:25 ` Geert Uytterhoeven
2022-06-08 18:12 ` Saravana Kannan
2022-06-08 18:47 ` Geert Uytterhoeven
2022-06-08 21:07 ` Saravana Kannan
2022-06-08 22:49 ` Jakub Kicinski
2022-06-08 23:15 ` Saravana Kannan
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