From mboxrd@z Thu Jan 1 00:00:00 1970 From: shijie.huang@arm.com (Huang Shijie) Date: Tue, 18 Aug 2015 11:36:55 +0800 Subject: [PATCH 1/3] Honor ACPI _CCA attribute setting In-Reply-To: <55CDF74C.3050703@arm.com> References: <1439416290-21228-1-git-send-email-jeremy.linton@arm.com> <1439416290-21228-2-git-send-email-jeremy.linton@arm.com> <55CD4832.7070301@amd.com> <55CDF74C.3050703@arm.com> Message-ID: <20150818033655.GB9990@free64-pc.asiapac.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Aug 14, 2015 at 09:12:28AM -0500, Jeremy Linton wrote: > Hello Suravee, > > On 08/13/2015 08:45 PM, Suravee Suthikulpanit wrote: > > On 8/13/15 04:51, Jeremy Linton wrote: > >> ACPI configurations can now mark devices as noncoherent, > >> support that choice. > > > > This change was in my earlier revisions for the original patch series to > > add ACPI CCA support. At the time, this was pushed back since we were > > not sure whether this would be a useful case, and whether such hardware > > exists. > > Yes, I was made aware of that conversation during the review here. > > Basically, the ARM Juno development platform has a mix of coherent and > noncoherent devices. The EHCI being one of the primary noncoherent > peripherals. Without which, the usefulness of the platform for > developing with an ACPI kernel is limited. > Tesed-by: Huang Shijie