From: Juergen Beisert <jbe@pengutronix.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/2] video: Add i.MX23/28 framebuffer driver
Date: Thu, 10 Feb 2011 09:46:33 +0000 [thread overview]
Message-ID: <201102101046.33994.jbe@pengutronix.de> (raw)
In-Reply-To: <09EC74FE2C9E8444BF2FF67BD36E1D69167919@039-SN1MPN1-003.039d.mgd.msft.net>
Li Frank-B20596 wrote:
> > +
> > + /* if it was disabled, re-enable the mode again */
> > + reg = readl(host->base + CTRL);
> > + reg |= CTRL_DOTCLK_MODE;
> > + writel(reg, host->base + CTRL);
>
> writel(CTRL_DOTCLK_MODE, host->base + CTRL_SET)
> CTRL_SET is CTRL+0x4
> SET and CLR register is easier than Read and write back.
But you must always check, if the register really has such a SET and CLEAR
feature. Not all registers have this feature...
But in this case you are right.
But I would prefer:
#define SET 4
#define CLEAR 8
[...]
writel(CTRL_DOTCLK_MODE, host->base + CTRL + SET)
:-)
Regards,
Juergen
--
Pengutronix e.K. | Juergen Beisert |
Linux Solutions for Science and Industry | Phone: +49-8766-939 228 |
Vertretung Sued/Muenchen, Germany | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2011-02-10 9:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1297257651-8002-1-git-send-email-s.hauer@pengutronix.de>
2011-02-09 13:20 ` [PATCH 1/2] video: Add i.MX23/28 framebuffer driver Sascha Hauer
2011-02-09 13:35 ` Lothar Waßmann
2011-02-10 3:16 ` Li Frank-B20596
2011-02-10 8:51 ` Juergen Beisert
2011-02-10 9:15 ` Li Frank-B20596
2011-02-10 9:52 ` Juergen Beisert
2011-02-10 10:37 ` Li Frank-B20596
2011-02-10 11:12 ` Juergen Beisert
2011-02-10 12:23 ` Li Frank-B20596
2011-02-10 9:23 ` Li Frank-B20596
2011-02-10 9:46 ` Juergen Beisert [this message]
2011-02-10 10:08 ` Li Frank-B20596
2011-02-10 10:47 ` Wolfram Sang
2011-02-10 11:51 ` Sascha Hauer
2011-02-10 12:32 ` Li Frank-B20596
[not found] ` <201102091547.12131.arnd@arndb.de>
[not found] ` <20110209153716.GN9041@pengutronix.de>
2011-02-09 16:31 ` [PATCH] " Arnd Bergmann
2011-02-10 17:09 ` Robert Schwebel
2011-02-15 14:13 ` Clark, Rob
2011-02-16 12:22 ` Arnd Bergmann
[not found] ` <AANLkTik+ounqcTJ6rhiUqKPGkwcCOKGXdsVADs6zHfPU@mail.gmail.com>
2011-02-17 1:08 ` Clark, Rob
[not found] ` <AANLkTim3iUNHsaCf7387H-X+XW0YDQsQVa1FwDvo0KvH@mail.gmail.com>
2011-02-17 15:25 ` Clark, Rob
[not found] ` <AANLkTimOUnaHNMg03cHAiNJLuGhGuMWSHt+kibxWfYMH@mail.gmail.com>
2011-02-18 4:34 ` Clark, Rob
2011-02-17 16:14 ` James Simmons
[not found] ` <AANLkTimcwr4vpycSQCH9vMaB+umh+yHD_+WD2MJNqMOB@mail.gmail.com>
[not found] ` <AANLkTimcwr4vpycSQCH9vMaB+umh+yHD_+WD2MJNqMOB-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-02-18 4:32 ` Clark, Rob
2011-02-21 3:12 ` Dave Airlie
[not found] <1297850199-1688-1-git-send-email-s.hauer@pengutronix.de>
2011-02-16 9:56 ` [PATCH 1/2] video: Add " Sascha Hauer
2011-02-18 5:24 ` Shawn Guo
2011-02-18 8:30 ` Sascha Hauer
2011-02-18 8:57 ` Shawn Guo
2011-02-18 12:29 ` Shawn Guo
2011-02-21 14:17 ` Sascha Hauer
[not found] <1298880152-28913-1-git-send-email-s.hauer@pengutronix.de>
2011-02-28 8:02 ` Sascha Hauer
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