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From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Mario.Limonciello@dell.com
Cc: linux-usb@vger.kernel.org, andreas.noever@gmail.com,
	michael.jamet@intel.com, YehezkelShB@gmail.com,
	rajmohan.mani@intel.com,
	nicholas.johnson-opensource@outlook.com.au, lukas@wunner.de,
	gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
	anthony.wong@canonical.com, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 22/22] thunderbolt: Do not start firmware unless asked by the user
Date: Tue, 1 Oct 2019 17:58:50 +0300
Message-ID: <20191001145850.GZ2714@lahna.fi.intel.com> (raw)
In-Reply-To: <10cccc5a8d1a43fd9769ab6c4b53aeba@AUSX13MPC105.AMER.DELL.COM>

On Tue, Oct 01, 2019 at 02:43:15PM +0000, Mario.Limonciello@dell.com wrote:
> > -----Original Message-----
> > From: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Sent: Tuesday, October 1, 2019 6:39 AM
> > To: linux-usb@vger.kernel.org
> > Cc: Andreas Noever; Michael Jamet; Mika Westerberg; Yehezkel Bernat; Rajmohan
> > Mani; Nicholas Johnson; Lukas Wunner; Greg Kroah-Hartman; Alan Stern;
> > Limonciello, Mario; Anthony Wong; linux-kernel@vger.kernel.org
> > Subject: [RFC PATCH 22/22] thunderbolt: Do not start firmware unless asked by the
> > user
> > 
> > 
> > [EXTERNAL EMAIL]
> > 
> > Since now we can do pretty much the same thing in the software
> > connection manager than the firmware would do, there is no point
> > starting it by default. Instead we can just continue using the software
> > connection manager.
> > 
> > Make it possible for user to switch between the two by adding a module
> > pararameter (start_icm) which is by default false. Having this ability
> > to enable the firmware may be useful at least when debugging possible
> > issues with the software connection manager implementation.
> 
> If the host system firmware didn't start the ICM, does that mean SW connection
> manager would just take over even on systems with discrete AR/TR controllers?

Yes. This is pretty much the case with Apple systems now.

> > 
> > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > ---
> >  drivers/thunderbolt/icm.c | 14 +++++++++++---
> >  drivers/thunderbolt/tb.c  |  4 ----
> >  2 files changed, 11 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
> > index 9c9c6ea2b790..c4a2de0f2a44 100644
> > --- a/drivers/thunderbolt/icm.c
> > +++ b/drivers/thunderbolt/icm.c
> > @@ -11,6 +11,7 @@
> > 
> >  #include <linux/delay.h>
> >  #include <linux/mutex.h>
> > +#include <linux/moduleparam.h>
> >  #include <linux/pci.h>
> >  #include <linux/pm_runtime.h>
> >  #include <linux/platform_data/x86/apple.h>
> > @@ -43,6 +44,10 @@
> >  #define ICM_APPROVE_TIMEOUT		10000	/* ms */
> >  #define ICM_MAX_LINK			4
> > 
> > +static bool start_icm;
> > +module_param(start_icm, bool, 0444);
> > +MODULE_PARM_DESC(start_icm, "start ICM firmware if it is not running (default:
> > false)");
> > +
> >  /**
> >   * struct icm - Internal connection manager private data
> >   * @request_lock: Makes sure only one message is send to ICM at time
> > @@ -1353,13 +1358,16 @@ static bool icm_ar_is_supported(struct tb *tb)
> >  {
> >  	struct pci_dev *upstream_port;
> >  	struct icm *icm = tb_priv(tb);
> > +	u32 val;
> > 
> >  	/*
> >  	 * Starting from Alpine Ridge we can use ICM on Apple machines
> >  	 * as well. We just need to reset and re-enable it first.
> 
> This comment doesn't really seem as relevant anymore.  The meaning of it
> has nothing to do with Apple anymore.

Actually it is still relevant. For USB4 the intent is to have FW/SW CM
switch in ACPI spec instead. But that is still under discussion.

> > +	 * However, only start it if explicitly asked by the user.
> >  	 */
> > -	if (!x86_apple_machine)
> > -		return true;
> > +	val = ioread32(tb->nhi->iobase + REG_FW_STS);
> > +	if (!(val & REG_FW_STS_ICM_EN) && !start_icm)
> > +		return false;
> 
> This code is already in icm_firmware_start.  Maybe split it to a small function
> So you can just have the more readable
> 
> If (!icm_firmware_running(tb) && !start_icm))

Good point. I'll do that.

  reply index

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-01 11:38 [RFC PATCH 00/22] thunderbolt: Add support for USB4 Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 01/22] thunderbolt: Introduce tb_switch_is_icm() Mika Westerberg
2019-10-01 12:10   ` Greg Kroah-Hartman
2019-10-01 12:46     ` Mika Westerberg
2019-10-01 13:36       ` Mario.Limonciello
2019-10-01 13:48         ` Mika Westerberg
2019-10-01 13:50           ` Mario.Limonciello
2019-10-01 13:52             ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 02/22] thunderbolt: Log switch route string on config read/write timeout Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 03/22] thunderbolt: Log warning if adding switch fails Mika Westerberg
2019-10-01 12:18   ` Greg Kroah-Hartman
2019-10-01 12:48     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 04/22] thunderbolt: Make tb_sw_write() take const parameter Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 05/22] thunderbolt: Add helper macros to iterate over switch ports Mika Westerberg
2019-10-02 14:17   ` Oliver Neukum
2019-10-02 14:28     ` Mika Westerberg
2019-10-06 12:15       ` Lukas Wunner
2019-10-01 11:38 ` [RFC PATCH 06/22] thunderbolt: Add support for lane bonding Mika Westerberg
2019-10-01 12:38   ` Greg Kroah-Hartman
2019-10-01 12:53     ` Mika Westerberg
2019-10-02 14:21       ` Oliver Neukum
2019-10-02 14:30         ` Mika Westerberg
2019-10-03  8:25           ` Oliver Neukum
2019-10-03  8:53             ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 07/22] thunderbolt: Add default linking between ports if not provided by DROM Mika Westerberg
2019-10-01 12:39   ` Greg Kroah-Hartman
2019-10-01 13:14     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 08/22] thunderbolt: Add downstream PCIe port mappings for Alpine and Titan Ridge Mika Westerberg
2019-10-01 12:40   ` Greg Kroah-Hartman
2019-10-01 13:27     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 09/22] thunderbolt: Convert basic adapter register names to follow the USB4 spec Mika Westerberg
2019-10-01 12:41   ` Greg Kroah-Hartman
2019-10-01 13:28     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 10/22] thunderbolt: Convert PCIe adapter register names to use USB4 names Mika Westerberg
2019-10-01 12:42   ` Greg Kroah-Hartman
2019-10-01 11:38 ` [RFC PATCH 11/22] thunderbolt: Convert DP adapter register names to follow the USB4 spec Mika Westerberg
2019-10-01 12:42   ` Greg Kroah-Hartman
2019-10-01 11:38 ` [RFC PATCH 12/22] thunderbolt: Add Display Port CM handshake for Titan Ridge devices Mika Westerberg
2019-10-01 12:44   ` Greg Kroah-Hartman
2019-10-01 13:30     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 13/22] thunderbolt: Add Display Port adapter pairing and resource management Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 14/22] thunderbolt: Add bandwidth management for Display Port tunnels Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 15/22] thunderbolt: Make tb_find_port() available to other files Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 16/22] thunderbolt: Call tb_eeprom_get_drom_offset() from tb_eeprom_read_n() Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 17/22] thunderbolt: Add initial support for USB4 Mika Westerberg
2019-10-01 12:47   ` Greg Kroah-Hartman
2019-10-01 13:09     ` Mika Westerberg
2019-10-01 14:53       ` Greg Kroah-Hartman
2019-10-01 14:59         ` Mario.Limonciello
2019-10-01 15:13           ` Mika Westerberg
2019-10-01 15:22           ` Greg KH
2019-10-01 15:32             ` Mika Westerberg
2019-10-01 15:07         ` Mika Westerberg
2019-10-01 15:19           ` Greg Kroah-Hartman
2019-10-01 15:26             ` Mika Westerberg
2019-10-01 16:27           ` Oliver Neukum
2019-10-02  8:30             ` Mika Westerberg
2019-10-02  8:39               ` Greg Kroah-Hartman
2019-10-02  8:49                 ` Mika Westerberg
2019-10-01 17:05   ` Mario.Limonciello
2019-10-01 18:14     ` Mario.Limonciello
2019-10-02  8:39       ` Mika Westerberg
2019-10-02 15:09         ` Mario.Limonciello
2019-10-02 15:36           ` Yehezkel Bernat
2019-10-02 16:00             ` Mario.Limonciello
2019-10-03  8:00               ` Mika Westerberg
2019-10-03 14:41                 ` Mario.Limonciello
2019-10-04  7:54                   ` Mika Westerberg
2019-10-04  8:07                     ` Yehezkel Bernat
2019-10-04  8:19                       ` Mika Westerberg
2019-10-04 11:19                         ` Yehezkel Bernat
2019-10-04 14:05                           ` Mario.Limonciello
2019-10-04 14:19                             ` Mario.Limonciello
2019-10-04 14:21                             ` Mika Westerberg
     [not found]                               ` <1570201357.2.0@kellner.me>
2019-10-04 15:16                                 ` Mika Westerberg
2019-10-04 15:22                                   ` Christian Kellner
2019-10-02  8:34     ` Mika Westerberg
2019-10-02 15:04       ` Mario.Limonciello
2019-10-01 11:38 ` [RFC PATCH 18/22] thunderbolt: Make tb_switch_find_cap() available to other files Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 19/22] thunderbolt: Add support for Time Management Unit Mika Westerberg
2019-10-02 16:52   ` Mani, Rajmohan
2019-10-03  8:01     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 20/22] thunderbolt: Add support for USB tunnels Mika Westerberg
2019-10-03  8:42   ` Oliver Neukum
2019-10-03  8:52     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 21/22] thunderbolt: Update documentation with the USB4 information Mika Westerberg
2019-10-01 14:17   ` Mario.Limonciello
2019-10-01 14:21     ` Mika Westerberg
2019-10-01 11:38 ` [RFC PATCH 22/22] thunderbolt: Do not start firmware unless asked by the user Mika Westerberg
2019-10-01 14:43   ` Mario.Limonciello
2019-10-01 14:58     ` Mika Westerberg [this message]
2019-10-01 16:53       ` Mario.Limonciello
2019-10-02  8:48         ` Mika Westerberg
2019-10-01 12:49 ` [RFC PATCH 00/22] thunderbolt: Add support for USB4 Greg Kroah-Hartman
2019-10-01 13:42   ` Mika Westerberg

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