Messages in this thread | | | Date | Sun, 25 Mar 2018 13:50:40 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v3] x86: i8237: Register based on FADT legacy boot flag |
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On Thu, 22 Mar 2018, Anshuman Gupta wrote:
> From: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com> > > >From Skylake onwards, the platform controller hub (Sunrisepoint PCH) does > not support legacy DMA operations to IO ports 81h-83h, 87h, 89h-8Bh, 8Fh. > Currently this driver registers as syscore ops and its resume function is > called on every resume from S3. On Skylake and Kabylake, this causes a > resume delay of around 100ms due to port IO operations, which is a problem. > > This change allows to load the driver only when the platform bios > explicitly supports such devices or has a cut-off date earlier than 2017.
Please explain WHY 2017 is the cut-off date. I still have no clue how that is decided aside of being a random number.
Thanks,
tglx
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