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Wysocki" Cc: "Rafael J. Wysocki" , Paul Menzel , Mario Limonciello , "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" , Linux Kernel Mailing List , Thorsten Leemhuis , ACPI Devel Maling List , Greg Kroah-Hartman Subject: Re: `ucsi_acpi: probe of USBC000:00 failed with error -12` on Dell XPS 13 9360/9370 Message-ID: <20180518212857.GA21732@kuha.fi.intel.com> References: <69da4aa4-3d4b-0ffc-81ce-500713cd3743@molgen.mpg.de> <20180516080226.GC3536@kroah.com> <20180516115814.GB11469@kuha.fi.intel.com> <20180517085930.GD11469@kuha.fi.intel.com> <40707f34-e0a6-3114-36a3-6603bdcd8d82@molgen.mpg.de> <20180518104000.GA13595@kuha.fi.intel.com> <20180518150823.GA14756@kuha.fi.intel.com> <20180518151543.GA6501@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-usb-owner@vger.kernel.org X-Mailing-List: linux-usb@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Fri, May 18, 2018 at 10:04:02PM +0200, Rafael J. Wysocki wrote: > On Fri, May 18, 2018 at 5:15 PM, Greg Kroah-Hartman > > Given that Windows works with this same set of ACPI tables, perhaps the > > requirement isn't that this memory location be uncached? > > > > We shouldn't have to fix up ACPI tables just for Linux, we've been down > > that path before :( > > Yes, pretty much. That's not what I'm suggesting. AFAIK these Dell laptops are the only ones with this problem, so if we accept this, I fear it means we have to start maintaining DMI quirk table in the driver, and then: if (dell) ioremap_cache() else ioremap_nocache() I was really hoping we could avoid that. Or is there something else we can do in the driver? I have no idea how the windows driver works, so I will double check and test this next week, but our driver has really worked fine so far. Thanks, -- heikki