From: Matthijs van Duin <matthijsvanduin@gmail.com> To: Tony Lindgren <tony@atomide.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: Wed, 2 Dec 2015 01:10:10 +0100 [thread overview] Message-ID: <CAALWOA-Cy7MUUE-6i7sovSQLj8g86E1gZu06+45oB20QGGQweA@mail.gmail.com> (raw) In-Reply-To: <1449013103-23238-6-git-send-email-tony@atomide.com> 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. 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.) Matthijs
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From: matthijsvanduin@gmail.com (Matthijs van Duin) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/10] ARM: OMAP2+: Disable GPIO softreset for dm81xx Date: Wed, 2 Dec 2015 01:10:10 +0100 [thread overview] Message-ID: <CAALWOA-Cy7MUUE-6i7sovSQLj8g86E1gZu06+45oB20QGGQweA@mail.gmail.com> (raw) In-Reply-To: <1449013103-23238-6-git-send-email-tony@atomide.com> 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. 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.) Matthijs
next prev parent reply other threads:[~2015-12-02 0:10 UTC|newest] Thread overview: 73+ 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 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 01/10] ARM: OMAP2+: Fix timer entries for dm814x Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 02/10] clk: ti: Add few dm814x clock aliases Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-08 16:57 ` Tony Lindgren 2015-12-08 16:57 ` Tony Lindgren 2015-12-08 19:26 ` Tero Kristo 2015-12-08 19:26 ` Tero Kristo 2015-12-08 19:26 ` Tero Kristo 2015-12-08 20:11 ` Tony Lindgren 2015-12-08 20:11 ` Tony Lindgren 2015-12-09 7:51 ` Tero Kristo 2015-12-09 7:51 ` Tero Kristo 2015-12-09 7:51 ` Tero Kristo 2015-12-10 0:56 ` Tony Lindgren 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 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 04/10] ARM: OMAP2+: Enable GPIO " Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 05/10] ARM: OMAP2+: Disable GPIO softreset for dm81xx Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-02 0:10 ` Matthijs van Duin [this message] 2015-12-02 0:10 ` Matthijs van Duin 2015-12-02 0:10 ` Matthijs van Duin 2015-12-02 0:41 ` Tony Lindgren 2015-12-02 0:41 ` Tony Lindgren 2015-12-02 0:41 ` Tony Lindgren 2015-12-02 0:54 ` Tony Lindgren 2015-12-02 0:54 ` Tony Lindgren 2015-12-02 0:54 ` Tony Lindgren 2015-12-02 1:38 ` Tony Lindgren 2015-12-02 1:38 ` Tony Lindgren 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 ` 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 ` 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 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 09/10] ARM: dts: Fix dm8148 control modules ranges Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-01 23:38 ` [PATCH 10/10] ARM: dts: Fix dm814x pinctrl address and mask Tony Lindgren 2015-12-01 23:38 ` Tony Lindgren 2015-12-02 0:25 ` Matthijs van Duin 2015-12-02 0:25 ` Matthijs van Duin 2015-12-02 0:25 ` Matthijs van Duin 2015-12-02 0:46 ` Tony Lindgren 2015-12-02 0:46 ` Tony Lindgren 2015-12-02 0:46 ` Tony Lindgren 2015-12-02 1:14 ` Matthijs van Duin 2015-12-02 1:14 ` Matthijs van Duin 2015-12-02 1:14 ` Matthijs van Duin 2015-12-02 1:22 ` Tony Lindgren 2015-12-02 1:22 ` Tony Lindgren 2015-12-02 1:22 ` Tony Lindgren 2015-12-02 16:09 ` Tony Lindgren 2015-12-02 16:09 ` Tony Lindgren 2015-12-02 16:09 ` Tony Lindgren 2015-12-02 1:21 ` Matthijs van Duin 2015-12-02 1:21 ` Matthijs van Duin 2015-12-02 1:21 ` Matthijs van Duin 2015-12-02 16:13 ` Tony Lindgren 2015-12-02 16:13 ` Tony Lindgren 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 18:17 ` Grygorii Strashko 2015-12-03 18:17 ` Grygorii Strashko 2015-12-03 19:21 ` Tony Lindgren 2015-12-03 19:21 ` Tony Lindgren
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