Re: i915 HDCP 2.2 TX encryption on Teledyne test instrument

From: Ramalingam C <ramalingam.c@intel.com>
To: "Voldman, Mikhail" <Mikhail.Voldman@Teledyne.com>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>,
	Kurmi Suresh Kumar <suresh.kumar.kurmi@intel.com>
Subject: Re: i915 HDCP 2.2 TX encryption on Teledyne test instrument
Date: Wed, 6 Nov 2019 10:42:00 +0530	[thread overview]
Message-ID: <20191106051159.GA32360@intel.com> (raw)
In-Reply-To: <BN8PR14MB3156BC64F3EB8DDAB2AC5295857E0@BN8PR14MB3156.namprd14.prod.outlook.com>

Moving to #intel-gfx

Hi,

Glad that I could help you!

On 2019-11-05 at 21:56:28 +0000, Voldman, Mikhail wrote:
> Hello Ramalingam,
> 
> Thank you for quick response. 
> Your information is very helpful. 
> But can you elaborate:
> 
> In your product, If you want to enable the HDCP always based on the sink capability, set
> the "Content protection" to DESIRED state along with desired content
> type.  [MV] should I set DESIRED protection level as DRM master?  
This needs additional kernel patch for your product to set the desired
state as default state of the property at the creation.
> 
> As these are properties, non DRM Masters can only read them. can set
> them. [MV] do you mean: " non DRM Masters can only read them, but  can't set them." 
Yes.
> Can I use MEI interface to control HDCP?
Not needed if you set the default state as desired.
-Ram
> 
> Mikhail Voldman
> System Architect
> 
> Teledyne LeCroy, Protocol Solutions Group
> 2111 Big Timber Road
> Elgin, IL  60123
> Note new email address:  mikhail.voldman@teledyne.com
> 847-888-0450 x136
> 
> Send me a file securely
> 
> 
> -----Original Message-----
> From: Ramalingam C <ramalingam.c@intel.com> 
> Sent: Monday, November 4, 2019 10:44 PM
> To: Voldman, Mikhail <Mikhail.Voldman@Teledyne.com>
> Cc: Kurmi Suresh Kumar <suresh.kumar.kurmi@intel.com>
> Subject: Re: i915 HDCP 2.2 TX encryption on Teledyne test instrument
> 
> ---External Email---
> 
> On 2019-11-04 at 20:42:49 +0000, Voldman, Mikhail wrote:
> > Hello Ramalingam,
> > 
> > We exchanged number of e-mails few months ago regarding Linux i915 HDCP 2.2 encryption  support in the new Teledyne video test instrument.
> > Thanks for your help we were able to control HDCP 2.2 encryption as DRM masters.
> > 
> > Unfortunately our product requirement specified than we need to  enable HDCP 2.2 always if attached monitor capabilities shows HDCP 2.2 support.
> > Also i915 based TX required to execute HDCP 2.2 re-authentication if Sink HPD is detected.
> > 
> > Is current Intel i915 kernel driver implementation can support desired functionality? Do you have plans to support this?
> 
> "HDCP always" will never be an upstream solution. always userspace
> driven.
> 
> In your product, If you want to enable the HDCP always based on the sink capability, set
> the "Content protection" to DESIRED state along with desired content
> type.
> 
> As these are properties, non DRM Masters can only read them. can set
> them.
> 
> Hope you are unblocked. All the best!
> 
> -Ram
> > 
> > Are current i915 allow control HDCP encryption by NOT DRM master application?
> > 
> > Any suggestion or advice by Intel HDCP 2.2 experts will be really appreciated.
> > 
> > Best Regards,
> > 
> > Mikhail Voldman
> > System Architect
> > [cid:image001.gif@01D2D0A7.919320A0]
> > Teledyne LeCroy, Protocol Solutions Group
> > 2111 Big Timber Road
> > Elgin, IL  60123
> > Note new email address:  mikhail.voldman@teledyne.com<mailto:mikhail.voldman@teledyne.com>
> > 847-888-0450 x136
> > 
> > Send me a file securely<https://transfereast.teledyne.com/filedrop/mikhail.voldman@teledyne.com>
> > 
> 
> 
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