From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Archit Taneja <archit@ti.com>
Cc: "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>
Subject: Re: [PATCH 00/19] OMAP: DSS2: ULPS support
Date: Wed, 20 Apr 2011 09:08:38 +0300 [thread overview]
Message-ID: <1303279718.2102.10.camel@deskari> (raw)
In-Reply-To: <4DAE7270.2010306@ti.com>
On Wed, 2011-04-20 at 11:13 +0530, Archit Taneja wrote:
> On Tuesday 19 April 2011 02:52 PM, Valkeinen, Tomi wrote:
> > ULPS (Ultra-Low Power State) is a power saving method for DSI bus. When the
> > ULPS is entered, the host sends an ULPS entry sequence and pulls the DSI lines
> > down. On ULPS exit, the host sends an exit sequence and continues normal
> > operation. This allows both the host and the DSI peripheral to save some power
> > while in ULPS.
> >
> > This patch set implements ULPS support for DSS2. ULPS can be used with DSI
> > command mode displays, and as command mode displays can refresh the panel
> > independently using its own framebuffer, entering ULPS allows OMAP DSS HW to be
> > totally turned off while the image on the display stays. This in turn may allow
> > OMAP to enter deep sleep.
> >
> > Taal panel driver implements an inactivity timer which is used to enter ULPS
> > after a certain period. The period can configured via sysfs, "ulps_timeout"
> > file. A good value for the ulps_timeout depends on the use case and board, but
> > is most likely around 100-500ms.
> >
> > The patch set does not enable the ULPS timeout, but it has to be enabled either
> > manually via sysfs or from the board file.
> >
> > Tested on OMAP 4430 Blaze board. The patches are based on the current DSS2
> > master branch.
>
> Tested on 4430sdp and 3430sdp with Taal Panel.
Thanks. I've applied the ULPS patch set to my master branch.
Tomi
prev parent reply other threads:[~2011-04-20 6:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-19 9:22 [PATCH 00/19] OMAP: DSS2: ULPS support Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 01/19] OMAP: DSS2: DSI: Add lane override functions Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 02/19] OMAP: DSS2: DSI: Remove CIO LDO status check Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 03/19] OMAP: DSS2: DSI: implement ULPS enter and exit Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 04/19] OMAP: DSS2: DSI: add option to leave DSI lanes powered on Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 05/19] OMAP: DSS2: DSI: rename complexio related functions Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 06/19] OMAP: DSS2: Add FEAT_DSI_REVERSE_TXCLKESC Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 07/19] OMAP: DSS2: DSI: fix _dsi_print_reset_status Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 08/19] OMAP: DSS2: DSI: implement enable/disable SCP clk Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 09/19] OMAP: DSS2: DSI: fix CIO init and uninit Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 10/19] OMAP: DSS2: DSI: wait for TXCLKESC domain to come out of reset Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 11/19] OMAP: DSS2: DSI: add parameter to enter ulps on disable Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 12/19] OMAP: DSS2: DSI: Add DSI pad muxing support Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 13/19] OMAP: DSS2: DSI: ensure VDDS_DSI is disabled on exit Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 14/19] OMAP: DSS2: Taal: Implement configurable ESD interval Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 15/19] OMAP: DSS2: Taal: Clean up ESD queueing Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 16/19] OMAP: DSS2: Taal: Add sysfs file for ESD interval Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 17/19] OMAP: DSS2: Taal: Separate panel reset Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 18/19] OMAP: DSS2: Taal: Rename esd_wq to workqueue Tomi Valkeinen
2011-04-19 9:22 ` [PATCH 19/19] OMAP: DSS2: Taal: Implement ULPS functionality Tomi Valkeinen
2011-04-20 5:43 ` [PATCH 00/19] OMAP: DSS2: ULPS support Archit Taneja
2011-04-20 6:08 ` Tomi Valkeinen [this message]
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=1303279718.2102.10.camel@deskari \
--to=tomi.valkeinen@ti.com \
--cc=archit@ti.com \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-omap@vger.kernel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox