On 8/12/2015 6:26 PM, Daniel Vetter wrote:
On Mon, Aug 10, 2015 at 05:51:48PM +0530, Sivakumar Thulasimani wrote:
On 8/10/2015 5:44 PM, Jani Nikula wrote:
On Mon, 10 Aug 2015, Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx> wrote:
On 8/10/2015 5:07 PM, Jani Nikula wrote:
On Mon, 10 Aug 2015, Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx> wrote:
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx>
On 8/10/2015 10:35 AM, Sonika Jindal wrote:
With HPD support added for all ports including PORT_A, setting hpd_pin will
result in enabling of hpd to edp as well. There is no need to enable HPD on
PORT_A hence this patch removes hpd_pin update for PORT_A, where edp will
be connected. it can be added back when required
What? You can't just go ahead and remove HPD from eDP sinks.
BR,
Jani.
Nope, we are not removing HPD for edp sinks, it was never there in the
first place. It was
enabled for CHV (even there by mistake since PORT B/C was both DP and
eDP) but it was
never there for any other plaforms nor is it used for any purpose (PSR
must use it, but i
dont see code for it as well).
Are you saying there's no HPD enabled in our *hardware* for eDP? Or
driver?
My point is, is this patch making it harder to enable eDP hpd handling
(e.g. for PSR or DP link re-training) in the future? We currently take
it into account in a few places, and if we start removing that, it will
be a loss of effort to first remove and then add it back.
BR,
Jani.
i was referring to our driver only.
Our VLV/CHV code already receives hpd for every pps on and off which is
later ignored. if we dont disable HPD on eDPs this behavior will be extended
for all platforms which i feel is too costly to keep enabled when there is
no
purpose for it right now.
don't optimize code because you "feel it's costly", only do it when you
have hard numbers. One interrupt per pps on or off transition won't be
measurable at all.
-Daniel
let me rephrase my concern then :)
a) HPD was never enabled before this patch for edp
b) this patch series will enable hpd for edp
so why should we allow hpd for edp when no one is using it and will
cause problems
unless ignored explicitly ?
--
regards,
Sivakumar
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