[PATCH] drm/amd/amdgpu: Allow broadcast on debugfs read (v2)

[Christian König]

I briefly remember reading in some hardware doc that this actually has a 
defined behavior.

It was something about applying either bit wise "and" or "or" on the 
resulting bits and returning that to the reader.

This way you can check with a single broadcast read if an error occurred 
or if any of the instances are busy.

But if you don't actually use it I suggest to not implement this.

Regards,
Christian.

Am 11.10.2016 um 12:26 schrieb StDenis, Tom:
>
> That actually makes sense.  It came up because mmPA_SC_RASTER_CONFIG 
> (and _1) are read by libdrm with a selection of 0/*/* for 
> se/sh/instance so I wanted to be able to reproduce that via the 
> debugfs interface for testing.
>
>
> But ya, if you use the broadcast bit who are you reading from then ... 
> hmm..
>
>
> Tom
>
>
>
> ------------------------------------------------------------------------
> *From:* amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of 
> Michel Dänzer <michel.daenzer at mailbox.org>
> *Sent:* Monday, October 10, 2016 23:52
> *To:* Tom St Denis
> *Cc:* amd-gfx at lists.freedesktop.org
> *Subject:* Re: [PATCH] drm/amd/amdgpu: Allow broadcast on debugfs read 
> (v2)
> On 09/10/16 08:58 PM, Tom St Denis wrote:
> > Allow any of the se/sh/instance fields to be
> > specified as a broadcast by submitting 0x3FF.
> >
> > (v2) Fix broadcast range checking
> >
> > Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
>
> I'm not sure how a "broadcast read" is supposed to work? I can only see
> the register specs talking about broadcast in connection with writes.
>
>
> -- 
> Earthling Michel Dänzer               | http://www.amd.com 
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