All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org,
	Sean Paul <seanpaul@chromium.org>,
	dri-devel@lists.freedesktop.org, ramalingm.c@intel.com
Subject: Re: [Intel-gfx] [PATCH 03/11] drm/i915: Disable HDCP signalling on transcoder disable
Date: Mon, 9 Dec 2019 17:18:46 +0200	[thread overview]
Message-ID: <20191209151846.GQ1208@intel.com> (raw)
In-Reply-To: <20191206135509.GE162979@art_vandelay>

On Fri, Dec 06, 2019 at 08:55:09AM -0500, Sean Paul wrote:
> On Thu, Dec 05, 2019 at 09:33:19PM +0200, Ville Syrjälä wrote:
> > On Tue, Dec 03, 2019 at 12:36:26PM -0500, Sean Paul wrote:
> > > From: Sean Paul <seanpaul@chromium.org>
> > > 
> > > Currently we rely on intel_hdcp_disable() to disable HDCP signalling in
> > > the DDI Function Control register. This patch adds a safety net by also
> > > clearing the bit when we disable the transcoder.
> > > 
> > > Once we have HDCP over MST and disappearing connectors, we want to make
> > > sure that the signalling is truly disabled even if HDCP teardown doesn't
> > > go as planned.
> > 
> > Why wouldn't it go as planned?
> > 
> 
> Because things can fail in weird and wonderful ways on unplug :-)

Not really.

> 
> It's a safety net. I saw this function and figured HDCP signalling should be
> explicitly cleared here as well.

I call it dead and confusing code. If we get here with HDCP still
enabled we have a more serious bug somewhere else.

-- 
Ville Syrjälä
Intel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

WARNING: multiple messages have this Message-ID (diff)
From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org,
	Sean Paul <seanpaul@chromium.org>,
	dri-devel@lists.freedesktop.org, ramalingm.c@intel.com
Subject: Re: [Intel-gfx] [PATCH 03/11] drm/i915: Disable HDCP signalling on transcoder disable
Date: Mon, 9 Dec 2019 17:18:46 +0200	[thread overview]
Message-ID: <20191209151846.GQ1208@intel.com> (raw)
In-Reply-To: <20191206135509.GE162979@art_vandelay>

On Fri, Dec 06, 2019 at 08:55:09AM -0500, Sean Paul wrote:
> On Thu, Dec 05, 2019 at 09:33:19PM +0200, Ville Syrjälä wrote:
> > On Tue, Dec 03, 2019 at 12:36:26PM -0500, Sean Paul wrote:
> > > From: Sean Paul <seanpaul@chromium.org>
> > > 
> > > Currently we rely on intel_hdcp_disable() to disable HDCP signalling in
> > > the DDI Function Control register. This patch adds a safety net by also
> > > clearing the bit when we disable the transcoder.
> > > 
> > > Once we have HDCP over MST and disappearing connectors, we want to make
> > > sure that the signalling is truly disabled even if HDCP teardown doesn't
> > > go as planned.
> > 
> > Why wouldn't it go as planned?
> > 
> 
> Because things can fail in weird and wonderful ways on unplug :-)

Not really.

> 
> It's a safety net. I saw this function and figured HDCP signalling should be
> explicitly cleared here as well.

I call it dead and confusing code. If we get here with HDCP still
enabled we have a more serious bug somewhere else.

-- 
Ville Syrjälä
Intel
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  reply	other threads:[~2019-12-09 15:18 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 17:36 [PATCH 00/11] drm/i915: Add support for HDCP 1.4 over MST connectors Sean Paul
2019-12-03 17:36 ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 01/11] drm/i915: Fix sha_text population code Sean Paul
2019-12-03 17:36   ` Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-04  1:05   ` Sasha Levin
2019-12-04  1:05     ` [Intel-gfx] " Sasha Levin
2019-12-03 17:36 ` [PATCH 02/11] drm/i915: Intercept Aksv writes in the aux hooks Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-05 19:32   ` Ville Syrjälä
2019-12-05 19:32     ` Ville Syrjälä
2019-12-03 17:36 ` [PATCH 03/11] drm/i915: Disable HDCP signalling on transcoder disable Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-05 19:33   ` Ville Syrjälä
2019-12-05 19:33     ` Ville Syrjälä
2019-12-06 13:55     ` Sean Paul
2019-12-06 13:55       ` Sean Paul
2019-12-09 15:18       ` Ville Syrjälä [this message]
2019-12-09 15:18         ` Ville Syrjälä
2019-12-09 16:13         ` Sean Paul
2019-12-09 16:13           ` Sean Paul
2019-12-10 10:09           ` Daniel Vetter
2019-12-10 10:09             ` Daniel Vetter
2019-12-03 17:36 ` [PATCH 04/11] drm/i915: Don't WARN on HDCP toggle if get_hw_state returns false Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-05 19:39   ` Ville Syrjälä
2019-12-05 19:39     ` [Intel-gfx] " Ville Syrjälä
2019-12-06 13:52     ` Sean Paul
2019-12-06 13:52       ` [Intel-gfx] " Sean Paul
2019-12-09 15:21       ` Ville Syrjälä
2019-12-09 15:21         ` [Intel-gfx] " Ville Syrjälä
2019-12-09 16:16         ` Sean Paul
2019-12-09 16:16           ` [Intel-gfx] " Sean Paul
2019-12-09 17:22           ` Ville Syrjälä
2019-12-09 17:22             ` [Intel-gfx] " Ville Syrjälä
2019-12-03 17:36 ` [PATCH 05/11] drm/i915: Change toggle_signalling() argument to connector Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-05 19:48   ` Ville Syrjälä
2019-12-05 19:48     ` [Intel-gfx] " Ville Syrjälä
2019-12-03 17:36 ` [PATCH 06/11] drm/i915: Factor out hdcp->value assignments Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 07/11] drm/i915: Don't fully disable HDCP on a port if multiple pipes are using it Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 08/11] drm/i915: Support DP MST in enc_to_dig_port() function Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 09/11] drm/i915: Use ddi_update_pipe in intel_dp_mst Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 10/11] drm/i915: Expose HDCP shim functions from dp for use by dp_mst Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 17:36 ` [PATCH 11/11] drm/i915: Add HDCP 1.4 support for MST connectors Sean Paul
2019-12-03 17:36   ` [Intel-gfx] " Sean Paul
2019-12-03 20:11 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for drm/i915: Add support for HDCP 1.4 over " Patchwork

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191209151846.GQ1208@intel.com \
    --to=ville.syrjala@linux.intel.com \
    --cc=airlied@linux.ie \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=ramalingm.c@intel.com \
    --cc=sean@poorly.run \
    --cc=seanpaul@chromium.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.