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From: Arnd Bergmann <arnd@arndb.de>
To: Felipe Balbi <balbi@kernel.org>
Cc: Peter Chen <hzpeterchen@gmail.com>, Leo Li <pku.leo@gmail.com>,
	Grygorii Strashko <grygorii.strashko@ti.com>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	Sekhar Nori <nsekhar@ti.com>, lkml <linux-kernel@vger.kernel.org>,
	Stuart Yoder <stuart.yoder@nxp.com>,
	Scott Wood <oss@buserror.net>,
	David Fisher <david.fisher1@synopsys.com>,
	"Thang Q. Nguyen" <tqnguyen@apm.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev
Date: Tue, 06 Sep 2016 12:46:06 +0200	[thread overview]
Message-ID: <4416687.vUjZzKWZG6@wuerfel> (raw)
In-Reply-To: <87bn01o7jg.fsf@linux.intel.com>

On Tuesday, September 6, 2016 9:40:19 AM CEST Felipe Balbi wrote:
> 
> this only solves the problem for DT devices. Legacy devices and
> PCI-based systems will still suffer from the same problem. At least for
> dwc3, I will only be taking patches that solve the problem for all
> users, not a subset of them.

I don't think legacy devices are a worry, because they wouldn't
have this problem. For the PCI case, you are right that it cannot
work, in particular for machines that have complex IOMMU setup.

Some architectures (at least arm64 and sparc) check the bus_type of
a device in order to find the correct set of dma_map_ops for that
device, so there is no real way to handle this as long as you
pass a platform_device into an API that expects a pci_device.

	Arnd

  reply	other threads:[~2016-09-06 10:46 UTC|newest]

Thread overview: 91+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-25 19:21 [PATCH] usb: dwc3: host: inherit dma configuration from parent dev Grygorii Strashko
2016-04-26  6:17 ` Felipe Balbi
2016-04-26  8:14   ` Grygorii Strashko
2016-04-27  5:41     ` Felipe Balbi
2016-04-27 11:55       ` Grygorii Strashko
2016-04-27 13:59       ` Catalin Marinas
2016-04-27 14:11         ` Arnd Bergmann
2016-04-27 15:50           ` Catalin Marinas
2016-04-27 16:04             ` Arnd Bergmann
2016-04-27 16:53               ` Felipe Balbi
2016-04-27 17:42                 ` Arnd Bergmann
2016-04-27 17:59                   ` Alan Stern
2016-04-27 18:08                     ` Arnd Bergmann
2016-04-27 20:05                       ` Felipe Balbi
2016-04-27 21:05                         ` Arnd Bergmann
2016-04-28  6:37                           ` Felipe Balbi
2016-04-28 14:16                             ` Russell King - ARM Linux
2016-04-28 14:23                               ` Arnd Bergmann
2016-04-28 14:27                                 ` Felipe Balbi
2016-09-01 22:14                                   ` Leo Li
2016-09-02 10:43                                     ` Arnd Bergmann
2016-09-02 10:47                                       ` Russell King - ARM Linux
2016-09-02 11:08                                         ` Felipe Balbi
2016-09-02 14:11                                           ` Felipe Balbi
2016-09-02 14:21                                           ` Alan Stern
2016-09-02 15:51                                             ` Arnd Bergmann
2016-09-07  7:17                                               ` Roger Quadros
2016-09-07  8:29                                                 ` Arnd Bergmann
2016-09-07 13:04                                                   ` Roger Quadros
2016-09-07 14:38                                                     ` Arnd Bergmann
2016-09-02 16:23                                           ` Grygorii Strashko
2016-09-02 10:53                                       ` Felipe Balbi
2016-09-02 11:55                                         ` Robin Murphy
2016-09-02 12:56                                           ` Felipe Balbi
2016-09-02 13:10                                           ` Arnd Bergmann
2016-09-02 22:16                                       ` Leo Li
2016-09-05 15:39                                         ` Arnd Bergmann
2016-09-06  6:35                                           ` Peter Chen
2016-09-06  6:40                                             ` Felipe Balbi
2016-09-06 10:46                                               ` Arnd Bergmann [this message]
2016-09-06 10:50                                                 ` Felipe Balbi
2016-09-06 13:27                                                   ` Arnd Bergmann
2016-09-07  6:51                                                     ` Felipe Balbi
2016-09-07  7:44                                                     ` Peter Chen
2016-09-07  8:52                                                       ` Arnd Bergmann
2016-09-07  9:29                                                         ` Peter Chen
2016-09-07  9:35                                                           ` Russell King - ARM Linux
2016-09-07 10:18                                                             ` Felipe Balbi
2016-09-06 10:38                                             ` Arnd Bergmann
2016-09-07  6:33                                               ` Peter Chen
2016-09-07  8:48                                                 ` Arnd Bergmann
2016-09-07  9:55                                                   ` Peter Chen
2016-09-07 10:33                                                     ` Robin Murphy
2016-09-07 10:47                                                       ` Felipe Balbi
2016-09-14 16:31                                                         ` Lorenzo Pieralisi
2016-09-14 21:50                                                           ` Arnd Bergmann
2016-09-07 10:24                                                   ` Felipe Balbi
2016-09-07 15:24                                                     ` Arnd Bergmann
2016-09-07 16:08                                                       ` Alan Stern
2016-09-07 19:45                                                         ` Arnd Bergmann
2016-09-08  1:15                                                       ` Peter Chen
2016-09-08  8:02                                                         ` Arnd Bergmann
2016-09-08  8:03                                                       ` Felipe Balbi
2016-09-08  8:26                                                         ` Arnd Bergmann
2016-09-08  8:29                                                           ` Felipe Balbi
2016-09-08  8:45                                                             ` Arnd Bergmann
2016-09-08  9:43                                                               ` Felipe Balbi
2016-09-08 10:17                                                                 ` Arnd Bergmann
2016-09-08 11:00                                                                   ` Felipe Balbi
2016-09-08 11:11                                                                     ` Arnd Bergmann
2016-09-08 11:20                                                                       ` Felipe Balbi
2016-09-08 11:39                                                                         ` Arnd Bergmann
2016-09-08 11:52                                                                           ` Felipe Balbi
2016-09-08 12:46                                                                             ` Arnd Bergmann
2016-09-08 12:02                                                                     ` Grygorii Strashko
2016-09-08 12:14                                                                       ` Arnd Bergmann
2016-09-08 12:28                                                                   ` Peter Chen
2016-09-08 12:52                                                                     ` Arnd Bergmann
2016-09-09  1:37                                                                       ` Peter Chen
2016-09-08 12:59                                                                     ` Grygorii Strashko
2016-09-09  1:52                                                                       ` Peter Chen
2016-09-21 11:06                                                       ` Sriram Dash
2016-09-21 11:31                                                         ` Arnd Bergmann
2016-09-21 11:43                                                           ` Sriram Dash
2016-09-21 12:48                                                             ` Arnd Bergmann
2016-09-22  5:02                                                               ` Sriram Dash
2016-10-07 22:46                                                                 ` Leo Li
2016-09-21 17:14                                                             ` [PATCH] usb: xhci: Fix the patch inherit dma configuration from kbuild test robot
2016-04-27 20:57                   ` [PATCH] usb: dwc3: host: inherit dma configuration from parent dev Felipe Balbi
2016-04-27 14:14         ` Grygorii Strashko
2016-05-05 17:07 ` Brian Norris

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