[PATCH v7 0/3] Timer support for ARM Tegra

[Svyatoslav Ryhel]

Yes, it works perfectly fine on the T20/T30/T124/T186 and T210, T114
board no one has on hand. Timer enabling has to be adjusted as Thierry
suggested.

вт, 31 січ. 2023 р. о 17:18 Tom Warren <TWarren at nvidia.com> пише:
>
> Has this been tested yet? I want to get it into the next PR, and I need a tested-by for V7 before I can do that.
>
> Thanks,
>
> Tom
>
> -----Original Message-----
> From: Svyatoslav R. <clamor95 at gmail.com>
> Sent: Friday, January 27, 2023 1:28 PM
> To: Thierry Reding <thierry.reding at gmail.com>
> Cc: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>; Tom Warren <twarren at nvidia.com>; Marek Vasut <marex at denx.de>; Maxim Schwalm <maxim.schwalm at gmail.com>; Dmitry Osipenko <digetx at gmail.com>; Jonas Schwöbel <jonasschwoebel at yahoo.de>; Agneli <poczt at protonmail.ch>; Heinrich Schuchardt <xypron.glpk at gmx.de>; Michal Simek <michal.simek at amd.com>; Stefan Roese <sr at denx.de>; Eugen Hristev <eugen.hristev at microchip.com>; Michael Walle <michael at walle.cc>; Simon Glass <sjg at chromium.org>; Jim Liu <jim.t90615 at gmail.com>; William Zhang <william.zhang at broadcom.com>; Rick Chen <rick at andestech.com>; Stefan Herbrechtsmeier <stefan.herbrechtsmeier at weidmueller.com>; Andre Przywara <andre.przywara at arm.com>; Jaehoon Chung <jh80.chung at samsung.com>; u-boot at lists.denx.de
> Subject: Re: [PATCH v7 0/3] Timer support for ARM Tegra
>
> External email: Use caution opening links or attachments
>
>
> On 1/27/23 19:15, Thierry Reding wrote:
> > On Fri, Jan 27, 2023 at 09:13:09AM +0200, Svyatoslav Ryhel wrote:
> >> - ARM: tegra: remap clock_osc_freq for all Tegra family Enum
> >> clock_osc_freq was designed to use only with T20.
> >> This patch remaps it to use additional frequencies, added in
> >> T30+ SoC while maintaining backwards compatibility with T20.
> >>
> >> - drivers: timer: add timer driver for ARMv7 based Tegra devices Add
> >> timer support for T20/T30/T114/T124 and T210 based devices.
> >> Driver is based on DM, has device tree support and can be used on SPL
> >> and early boot stage.
> >>
> >> Arm64 Tegra (apart T210) according to comment in tegra-common.h use
> >> architected timer.
> >>
> >> - ARM: tegra: include timer as default option Enable TIMER as default
> >> option for all Tegra devices and enable TEGRA_TIMER for
> >> TEGRA_ARMV7_COMMON and TEGRA210.
> >> Additionally enable SPL_TIMER if build as SPL part and drop
> >> deprecated configs from common header.
> >>
> >> P. S. I have no arm64 Tegra and according to comment in
> >> tegra-common.h Use the Tegra US timer on ARMv7, but the architected
> >> timer on ARMv8.
> >>
> >> ---
> >> Changeog from V6
> >>   - use clk_m as timer calibration clock (this should properly fix T210)
> >>   - enable timer for T210
> >>
> >> Changed from v5:
> >>   - added paz00 tester
> >>
> >> Changed from v4:
> >>   - added comments
> >>
> >> Changed from v3:
> >>   - removed BOOTSTAGE ifdefs
> >>   - use early timer on boot stage unconditionally
> >> ---
> >> Svyatoslav Ryhel (3):
> >>    ARM: tegra: remap clock_osc_freq for all Tegra family
> >>    drivers: timer: add driver for ARMv7 based Tegra devices and T210
> >>    ARM: tegra: include timer as default option
> >>
> >>   arch/arm/Kconfig                        |   1 +
> >>   arch/arm/include/asm/arch-tegra/clock.h |   9 +-
> >>   arch/arm/mach-tegra/Kconfig             |   3 +
> >>   arch/arm/mach-tegra/clock.c             |  17 +++-
> >>   arch/arm/mach-tegra/cpu.c               |  70 ++++++++++---
> >>   arch/arm/mach-tegra/tegra114/clock.c    |  13 +--
> >>   arch/arm/mach-tegra/tegra124/clock.c    |  13 +--
> >>   arch/arm/mach-tegra/tegra20/clock.c     |   4 +-
> >>   arch/arm/mach-tegra/tegra210/clock.c    |  22 +---
> >>   arch/arm/mach-tegra/tegra30/clock.c     |  10 +-
> >>   drivers/timer/Kconfig                   |   8 ++
> >>   drivers/timer/Makefile                  |   1 +
> >>   drivers/timer/tegra-timer.c             | 130 ++++++++++++++++++++++++
> >>   drivers/usb/host/ehci-tegra.c           |  46 +++++++--
> >>   include/configs/tegra-common.h          |   6 --
> >>   15 files changed, 274 insertions(+), 79 deletions(-)
> >>   create mode 100644 drivers/timer/tegra-timer.c
> > Ugh... turns out I had completely messed up the testing on Tegra186
> > and it wasn't working at all. The problem is that the selection of the
> > TIMER symbol for all of Tegra causes the driver model to be used, but
> > there is no DM driver for the architected timer that's used on Tegra186.
> >
> > The quickest fix would be to do this:
> >
> > --- >8 ---
> > diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
> > index b50eec5b8c9b..05c8ce0e08dd 100644
> > --- a/arch/arm/mach-tegra/Kconfig
> > +++ b/arch/arm/mach-tegra/Kconfig
> > @@ -56,7 +56,6 @@ config TEGRA_COMMON
> >       select MISC
> >       select OF_CONTROL
> >       select SPI
> > -     select TIMER
> >       imply CMD_DM
> >       imply CRC32_VERIFY
> >
> > @@ -83,6 +82,7 @@ config TEGRA_ARMV7_COMMON
> >       select TEGRA_PINCTRL
> >       select TEGRA_PMC
> >       select TEGRA_TIMER
> > +     select TIMER
> >
> >   config TEGRA_ARMV8_COMMON
> >       bool "Tegra 64-bit common options"
> > @@ -137,6 +137,7 @@ config TEGRA210
> >       select TEGRA_PMC
> >       select TEGRA_PMC_SECURE
> >       select TEGRA_TIMER
> > +     select TIMER
> >
> >   config TEGRA186
> >       bool "Tegra186 family"
> > --- >8 ---
> >
> > So basically make TIMER selected on everything except Tegra186, so
> > that on Tegra186 things are basically unmodified.
>
> I can propose to include 'select TIMER' directly into TEGRA_TIMER config option. This will eliminate need of including it into mach-tegra Kconfigs.
>
> BTW, may you check current patch set on T124 and T210 if those work properly. My T30 devices work fine and same as before after switch to clk_m as timer calibration clock.
>
> Best Regards, Svyatoslav R.
>
> > Thierry