From: Tony Lindgren <tony@atomide.com>
To: Matthijs van Duin <matthijsvanduin@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Brian Hutchinson <b.hutchman@gmail.com>,
Delio Brignoli <dbrignoli@audioscience.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Philipp Rosenberger <ilu@linutronix.de>,
Paul Walmsley <paul@pwsan.com>
Subject: Re: [PATCH 05/10] ARM: OMAP2+: Disable GPIO softreset for dm81xx
Date: Tue, 1 Dec 2015 16:54:30 -0800 [thread overview]
Message-ID: <20151202005430.GY23396@atomide.com> (raw)
In-Reply-To: <20151202004136.GW23396@atomide.com>
* Tony Lindgren <tony@atomide.com> [151201 16:42]:
> * Matthijs van Duin <matthijsvanduin@gmail.com> [151201 16:11]:
> > On 2 December 2015 at 00:38, Tony Lindgren <tony@atomide.com> wrote:
> > > Looks like GPIO softreset status bit on both dm8168 and dm8148
> > > is broken and only goes high initially. After writing to sysc
> > > softreset bit, the resetdone bit never goes high again.
> >
> > The resetdone bit works fine, but it needs all clocks active to come
> > up. You're neglecting to enable the debounce clock to the GPIO module:
> >
> > > # mw.l 0x4818155c 0x2
> >
> > That should write 0x102 instead.
>
> It seems to work only once based on what I've seen :) If you try it
> after it's powered it never works. Could be I'm doing something wrong
> of course..
>
> > You can disable the debounce clock after resetting the module if you
> > don't need it, though I doubt there's any significant power savings
> > there. (More likely it exists as a separate bit to allow it to stay
> > enabled even if the module isn't, for wakeup on debounced inputs.)
>
> Hmm I tried setting HWMOD_CONTROL_OPT_CLKS_IN_RESET flag like we
> have for many SoCs to enable also sysclk18_ck but no luck. I can
> recheck that.
You're right with 0x102 it works, need to debug further.
Thanks,
Tony
next prev parent reply other threads:[~2015-12-02 0:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 23:38 [PATCH 00/10] Patches to get dm814x-evm booting to NFSroot Tony Lindgren
2015-12-01 23:38 ` [PATCH 01/10] ARM: OMAP2+: Fix timer entries for dm814x Tony Lindgren
2015-12-01 23:38 ` [PATCH 02/10] clk: ti: Add few dm814x clock aliases Tony Lindgren
2015-12-08 16:57 ` Tony Lindgren
2015-12-08 19:26 ` Tero Kristo
2015-12-08 20:11 ` Tony Lindgren
2015-12-09 7:51 ` Tero Kristo
2015-12-10 0:56 ` Tony Lindgren
2015-12-01 23:38 ` [PATCH 03/10] ARM: OMAP2+: Add DPPLS clock manager for dm814x Tony Lindgren
2015-12-01 23:38 ` [PATCH 04/10] ARM: OMAP2+: Enable GPIO " Tony Lindgren
2015-12-01 23:38 ` [PATCH 05/10] ARM: OMAP2+: Disable GPIO softreset for dm81xx Tony Lindgren
2015-12-02 0:10 ` Matthijs van Duin
2015-12-02 0:41 ` Tony Lindgren
2015-12-02 0:54 ` Tony Lindgren [this message]
2015-12-02 1:38 ` Tony Lindgren
2015-12-01 23:38 ` [PATCH 06/10] ARM: OMAP2+: Remove useless check for legacy booting for dm814x Tony Lindgren
2015-12-01 23:38 ` [PATCH 07/10] ARM: dts: Fix dm814x entries for pllss and prcm Tony Lindgren
2015-12-01 23:38 ` [PATCH 08/10] ARM: dts: Fix some mux and divider clocks to get dm814x-evm booting Tony Lindgren
2015-12-01 23:38 ` [PATCH 09/10] ARM: dts: Fix dm8148 control modules ranges Tony Lindgren
2015-12-01 23:38 ` [PATCH 10/10] ARM: dts: Fix dm814x pinctrl address and mask Tony Lindgren
2015-12-02 0:25 ` Matthijs van Duin
2015-12-02 0:46 ` Tony Lindgren
2015-12-02 1:14 ` Matthijs van Duin
2015-12-02 1:22 ` Tony Lindgren
2015-12-02 16:09 ` Tony Lindgren
2015-12-02 1:21 ` Matthijs van Duin
2015-12-02 16:13 ` Tony Lindgren
2015-12-03 18:17 ` [PATCH 00/10] Patches to get dm814x-evm booting to NFSroot Grygorii Strashko
2015-12-03 19:21 ` Tony Lindgren
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