Intel-GFX Archive on lore.kernel.org
 help / color / Atom feed
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Paulo Zanoni <przanoni@gmail.com>
Cc: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH 1/6] drm/i915/crt: don't set HOTPLUG bits on !PCH
Date: Fri, 12 Oct 2012 19:26:42 +0200
Message-ID: <CAKMK7uGheWjWm0y9q0FqDtxeOCiNs__SBKF1WeZ++fHHNzQb0A@mail.gmail.com> (raw)
In-Reply-To: <CA+gsUGQm3S=eTS6f7+M8F+KG7fhuq6AimD2ZwHJ-3LcEqqt98w@mail.gmail.com>

On Fri, Oct 12, 2012 at 7:17 PM, Paulo Zanoni <przanoni@gmail.com> wrote:
> Ok, so please do a final test: try to write something to those
> "must-be-preserved" bits and check if the values stay or not. If after
> writing 1 to bits 17-18, 20-23 you read 0, then you have my
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>. I still do plan
> to test the 6 patches of the series on hsw later btw.

I've tested a few bits on a few machines, and some do stick and some
cause ... strange things (like a seemingly random set of other
register bits also being set). I guess that's not the answer you've
been looking for. I'd still prefer if we just try to clear things,
worst case we can easily read out the current state of these reserved
bits at boot up and restore them at resume time. But I'd really prefer
if we reduce our reliance on the boot-up state from the bios as much
as possible. And in this case here the only way to figure things out
is to merge it (it's really early for 3.8 anyway) and see what
happens.

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-11 18:08 [PATCH 0/6] reduce register save/restoring accross suspend/resume Daniel Vetter
2012-10-11 18:08 ` [PATCH 1/6] drm/i915/crt: don't set HOTPLUG bits on !PCH Daniel Vetter
2012-10-12  2:47   ` Paulo Zanoni
2012-10-12  8:45     ` Daniel Vetter
2012-10-12 17:17       ` Paulo Zanoni
2012-10-12 17:26         ` Daniel Vetter [this message]
2012-10-17 21:31           ` Paulo Zanoni
2012-10-11 18:08 ` [PATCH 2/6] drm/i915/crt: explicitly set up HOTPLUG_BITS on resume Daniel Vetter
2012-10-17 21:42   ` Paulo Zanoni
2012-10-11 18:08 ` [PATCH 3/6] drm/i915: don't save/restor ADPA for kms Daniel Vetter
2012-10-17 21:49   ` Paulo Zanoni
2012-10-18 12:34     ` Daniel Vetter
2012-10-11 18:08 ` [PATCH 4/6] drm/i915: don't save/restore DP regs " Daniel Vetter
2012-10-11 18:08 ` [PATCH 5/6] drm/i915: don't save/restore irq " Daniel Vetter
2012-10-11 18:08 ` [PATCH 6/6] drm/i915: don't save/restore HWS_PGA reg " Daniel Vetter
2012-10-17  9:32   ` [PATCH 1/3] drm/i915: don't save/restore DP regs " Daniel Vetter
2012-10-17  9:32     ` [PATCH 2/3] drm/i915: don't save/restore irq " Daniel Vetter
2012-10-17  9:32     ` [PATCH 3/3] drm/i915: don't save/restore HWS_PGA reg " Daniel Vetter
2012-10-17 19:52     ` [PATCH 1/3] drm/i915: don't save/restore DP regs " Paulo Zanoni
2012-10-17 20:39       ` Daniel Vetter

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=CAKMK7uGheWjWm0y9q0FqDtxeOCiNs__SBKF1WeZ++fHHNzQb0A@mail.gmail.com \
    --to=daniel.vetter@ffwll.ch \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=przanoni@gmail.com \
    /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

Intel-GFX Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/intel-gfx/0 intel-gfx/git/0.git
	git clone --mirror https://lore.kernel.org/intel-gfx/1 intel-gfx/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 intel-gfx intel-gfx/ https://lore.kernel.org/intel-gfx \
		intel-gfx@lists.freedesktop.org
	public-inbox-index intel-gfx

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.freedesktop.lists.intel-gfx


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git