From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: Re: [PATCH v2 2/2] clk: tegra20: Enable lock-status polling for PLLs Date: Tue, 4 Sep 2018 12:06:36 +0300 Message-ID: <201809041206.37080.digetx@gmail.com> References: <20180830184210.5369-1-digetx@gmail.com> <909e2a52-4116-9ee7-db23-8ea1dfffade0@gmail.com> <20180903080111.GR1636@tbergstrom-lnx.Nvidia.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180903080111.GR1636@tbergstrom-lnx.Nvidia.com> Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: Peter De Schrijver Cc: Thierry Reding , Jonathan Hunter , Prashant Gaikwad , Michael Turquette , Stephen Boyd , linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org On Monday 03 September 2018 11:01:11 Peter De Schrijver wrote: > On Fri, Aug 31, 2018 at 12:45:17PM +0300, Dmitry Osipenko wrote: > > On 8/31/18 12:29 PM, Peter De Schrijver wrote: > > > On Thu, Aug 30, 2018 at 09:42:10PM +0300, Dmitry Osipenko wrote: > > >> Currently all PLL's on Tegra20 use a hardcoded delay despite of having > > >> a lock-status bit. The lock-status polling was disabled ~7 years ago > > >> because PLLE was failing to lock and was a suspicion that other PLLs > > >> might be faulty too. Other PLLs are okay, hence enable the lock-status > > >> polling for them. This reduces delay of any operation that require PLL > > >> to lock. > > >> > > >> Signed-off-by: Dmitry Osipenko > > >> --- > > >> > > >> Changelog: > > >> > > >> v2: Don't enable polling for PLLE as it known to not being able to > > >> lock. > > > > > > This isn't correct. The lock bit of PLLE can declare lock too early, > > > but the PLL itself does lock. > > > > Indeed, it locks but can't be polled for the lock-status as it doesn't > > have the lock-status bit. > > > > Do you want me to adjust the commit description or it is fine as is? > > I think it's better to adjust it. Okay. I expect to get a review from you for the other clock (and related) patches too and will send the new version once all the current patches will be reviewed. Please take a look at them once you'll have some free time, thanks. > > It is also a bit odd that PLLE has "lock_delay = 0", is it correct? > > That seems odd yes.. :)