From: dev@lynxeye.de (Lucas Stach)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/4] clk: tegra: add EMC clock driver
Date: Thu, 19 Dec 2013 12:43:28 +0100 [thread overview]
Message-ID: <1387453408.1712.3.camel@tellur> (raw)
In-Reply-To: <20131219100557.GE17188@tbergstrom-lnx.Nvidia.com>
Am Donnerstag, den 19.12.2013, 12:05 +0200 schrieb Peter De Schrijver:
[...]
>
> > funny tricks like running from IRAM since we can't access SDRAM during
> > the clock change? If so, I'm not sure how having the EMC clock changing
> > code is going to help your case (2) anyway, since we'll presumably have
> > to code up a custom stub in assembly for the part of the code that runs
> > from IRAM...
> >
>
> There is no need for assembler or running from IRAM (at least from Tegra30
> onwards, I don't know about Tegra20).
>
Tegra20 doesn't need any IRAM trickery, the sequence is just:
1. set up EMC shadow registers for new clock frequency
2. change EMC divider in CAR module
This was known working on Colibri T20 before the CCF change.
Regards,
Lucas
next prev parent reply other threads:[~2013-12-19 11:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-17 9:26 [PATCH 0/4] ARM: tegra: re-enable EMC scaling function for Tegra20 Joseph Lo
2013-12-17 9:26 ` [PATCH 1/4] ARM: tegra: moving tegra_bct_strapping to tegra-soc.h for global visibility Joseph Lo
2013-12-17 22:53 ` Stephen Warren
2013-12-18 8:20 ` Joseph Lo
2013-12-17 22:58 ` Stephen Warren
2013-12-17 9:26 ` [PATCH 2/4] clk: tegra: add EMC clock driver Joseph Lo
2013-12-17 22:58 ` Stephen Warren
2013-12-18 9:42 ` Joseph Lo
2013-12-18 18:28 ` Stephen Warren
2013-12-18 19:30 ` Mike Turquette
2013-12-19 8:57 ` Joseph Lo
2013-12-19 9:43 ` Joseph Lo
2013-12-19 19:41 ` Stephen Warren
2013-12-19 10:05 ` Peter De Schrijver
2013-12-19 11:43 ` Lucas Stach [this message]
2013-12-19 11:46 ` Peter De Schrijver
2013-12-19 19:44 ` Stephen Warren
2013-12-20 11:34 ` Peter De Schrijver
2013-12-17 9:26 ` [PATCH 3/4] memory: tegra20-emc: move out Tegra20 EMC driver from mach-tegra Joseph Lo
2013-12-17 9:26 ` [PATCH 4/4] clk: tegra20: enable EMC clock driver Joseph Lo
2013-12-17 23:02 ` Stephen Warren
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=1387453408.1712.3.camel@tellur \
--to=dev@lynxeye.de \
--cc=linux-arm-kernel@lists.infradead.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;
as well as URLs for NNTP newsgroup(s).