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From: Thierry Reding <thierry.reding@gmail.com>
To: Dmitry Osipenko <digetx@gmail.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: Jonathan Hunter <jonathanh@nvidia.com>,
	Peter De Schrijver <pdeschrijver@nvidia.com>,
	Prashant Gaikwad <pgaikwad@nvidia.com>,
	Marcel Ziswiler <marcel@ziswiler.com>,
	Marc Dietrich <marvin24@gmx.de>,
	linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 0/4] Restore ULPI USB on Tegra20
Date: Mon, 30 Apr 2018 11:48:21 +0200	[thread overview]
Message-ID: <20180430094821.GC2476@ulmo> (raw)
In-Reply-To: <20180426235818.10018-1-digetx@gmail.com>

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On Fri, Apr 27, 2018 at 02:58:14AM +0300, Dmitry Osipenko wrote:
> Hello,
> 
> This series of patches fixes ULPI USB on Tegra20. The original problem
> was reported by Marcel Ziswiler, he found that "ulpi-link" clock was
> incorrectly set to CDEV2 instead of PLL_P_OUT4. Marcel made a patch
> that changed the "ulpi-link" clock to PLL_P_OUT4 and that fixed issue
> with the USB for the devices that have CDEV2 being enabled by bootloader.
> The patch got into the kernel and later Marc Dietrich found that USB
> stopped working on the "paz00" Tegra20 board. After a bit of discussion
> was revealed that PLL_P_OUT4 is the parent clock of the CDEV2 and clock
> driver was setting CDEV2's parent incorrectly. The parent clock is actually
> determined by the pinmuxing config of CDEV2 pingroup. This patchset fixes
> the parent of CDEV2 clock by making Tegra's pinctrl driver a clock provider,
> providing CDEV1/2 clock muxes (thanks to Peter De Schrijver for the
> suggestion), and then setting these clock muxes as parents for the CDEV1/2
> clocks. In the end Marcel's CDEV2->PLL_P_OUT4 change is reverted since CDEV2
> (aka MCLK2) is the actual clock source for "ulpi-link".
> 
> Dmitry Osipenko (4):
>   clk: tegra20: Add DEV1/DEV2 OSC dividers
>   pinctrl: tegra20: Provide CDEV1/2 clock muxes
>   clk: tegra20: Set correct parents for CDEV1/2 clocks
>   ARM: dts: tegra20: Revert "Fix ULPI regression on Tegra20"
> 
>  arch/arm/boot/dts/tegra20.dtsi          |  2 +-
>  drivers/clk/tegra/clk-tegra20.c         | 18 +++++++++++----
>  drivers/pinctrl/tegra/pinctrl-tegra.c   | 11 ---------
>  drivers/pinctrl/tegra/pinctrl-tegra.h   | 11 +++++++++
>  drivers/pinctrl/tegra/pinctrl-tegra20.c | 30 ++++++++++++++++++++++++-
>  5 files changed, 55 insertions(+), 17 deletions(-)

Stephen, Michael, Linus,

as far as I can tell there aren't any build dependencies between the
above, so technically these could all be merged through the individual
trees. There's a runtime dependency from patch 2 on patch 1 and from
patch 3 on patch 2, though I don't think they will cause any actual
failures at runtime.

But I can also pick this up into the Tegra tree and send out pull
requests to you for v4.18 (at around v4.17-rc6), if that's what you
prefer.

Thierry

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  parent reply	other threads:[~2018-04-30  9:48 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26 23:58 Dmitry Osipenko
2018-04-26 23:58 ` [PATCH v1 1/4] clk: tegra20: Add DEV1/DEV2 OSC dividers Dmitry Osipenko
2018-04-27 12:33   ` Marcel Ziswiler
2018-04-27 12:54     ` Dmitry Osipenko
2018-04-27 13:00       ` Marcel Ziswiler
2018-05-03 11:59         ` Dmitry Osipenko
2018-05-03 12:02           ` Dmitry Osipenko
2018-05-03 12:30             ` Marcel Ziswiler
2018-05-03 12:35               ` Dmitry Osipenko
2018-04-30  7:48   ` Peter De Schrijver
2018-04-26 23:58 ` [PATCH v1 2/4] pinctrl: tegra20: Provide CDEV1/2 clock muxes Dmitry Osipenko
2018-04-30  7:46   ` Peter De Schrijver
2018-05-02 12:32   ` Linus Walleij
2018-04-26 23:58 ` [PATCH v1 3/4] clk: tegra20: Set correct parents for CDEV1/2 clocks Dmitry Osipenko
2018-04-30  7:46   ` Peter De Schrijver
2018-05-01 21:31   ` Stephen Boyd
2018-04-26 23:58 ` [PATCH v1 4/4] ARM: dts: tegra20: Revert "Fix ULPI regression on Tegra20" Dmitry Osipenko
2018-04-27 12:30 ` [PATCH v1 0/4] Restore ULPI USB on Tegra20 Marc Dietrich
2018-04-30  9:48 ` Thierry Reding [this message]
2018-04-30 11:28   ` Thierry Reding
2018-05-01 21:30     ` Stephen Boyd
2018-05-02 12:58     ` Linus Walleij

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