linux-kernel - Re: [PATCH V3 02/17] pinctrl: tegra: add suspend and resume support

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Date:   Wed, 19 Jun 2019 10:33:08 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Stephen Warren <swarren@...dotorg.org>
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        jonathanh@...dia.com, tglx@...utronix.de, jason@...edaemon.net,
        marc.zyngier@....com, linus.walleij@...aro.org, stefan@...er.ch,
        mark.rutland@....com, pdeschrijver@...dia.com, pgaikwad@...dia.com,
        sboyd@...nel.org, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org, jckuo@...dia.com, josephl@...dia.com,
        talho@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, mperttunen@...dia.com,
        spatra@...dia.com, robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V3 02/17] pinctrl: tegra: add suspend and resume support

On Tue, Jun 18, 2019 at 09:41:03AM -0600, Stephen Warren wrote:
> On 6/18/19 3:30 AM, Dmitry Osipenko wrote:
> > 18.06.2019 12:22, Dmitry Osipenko пишет:
> > > 18.06.2019 10:46, Sowjanya Komatineni пишет:
> > > > This patch adds suspend and resume support for Tegra pinctrl driver
> > > > and registers them to syscore so the pinmux settings are restored
> > > > before the devices resume.
> > > > 
> > > > Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> > > > ---
> > > >   drivers/pinctrl/tegra/pinctrl-tegra.c    | 62 ++++++++++++++++++++++++++++++++
> > > >   drivers/pinctrl/tegra/pinctrl-tegra.h    |  5 +++
> > > >   drivers/pinctrl/tegra/pinctrl-tegra114.c |  1 +
> > > >   drivers/pinctrl/tegra/pinctrl-tegra124.c |  1 +
> > > >   drivers/pinctrl/tegra/pinctrl-tegra20.c  |  1 +
> > > >   drivers/pinctrl/tegra/pinctrl-tegra210.c | 13 +++++++
> > > >   drivers/pinctrl/tegra/pinctrl-tegra30.c  |  1 +
> > > >   7 files changed, 84 insertions(+)
> > > > 
> > > > diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
> > > > index 34596b246578..ceced30d8bd1 100644
> > > > --- a/drivers/pinctrl/tegra/pinctrl-tegra.c
> > > > +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
> > > > @@ -20,11 +20,16 @@
> > > >   #include <linux/pinctrl/pinmux.h>
> > > >   #include <linux/pinctrl/pinconf.h>
> > > >   #include <linux/slab.h>
> > > > +#include <linux/syscore_ops.h>
> > > >   #include "../core.h"
> > > >   #include "../pinctrl-utils.h"
> > > >   #include "pinctrl-tegra.h"
> > > > +#define EMMC2_PAD_CFGPADCTRL_0			0x1c8
> > > > +#define EMMC4_PAD_CFGPADCTRL_0			0x1e0
> > > > +#define EMMC_DPD_PARKING			(0x1fff << 14)
> > > > +
> > > >   static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
> > > >   {
> > > >   	return readl(pmx->regs[bank] + reg);
> > > > @@ -619,6 +624,48 @@ static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
> > > >   			pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
> > > >   		}
> > > >   	}
> > > > +
> > > > +	if (pmx->soc->has_park_padcfg) {
> > > > +		val = pmx_readl(pmx, 0, EMMC2_PAD_CFGPADCTRL_0);
> > > > +		val &= ~EMMC_DPD_PARKING;
> > > > +		pmx_writel(pmx, val, 0, EMMC2_PAD_CFGPADCTRL_0);
> > > > +
> > > > +		val = pmx_readl(pmx, 0, EMMC4_PAD_CFGPADCTRL_0);
> > > > +		val &= ~EMMC_DPD_PARKING;
> > > > +		pmx_writel(pmx, val, 0, EMMC4_PAD_CFGPADCTRL_0);
> > > > +	}
> > > > +}
> > > 
> > > Is there any reason why parked_bit can't be changed to parked_bitmask like I was
> > > asking in a comment to v2?
> > > 
> > > I suppose that it's more preferable to keep pinctrl-tegra.c platform-agnostic for
> > > consistency when possible, hence adding platform specifics here should be discouraged.
> > > And then the parked_bitmask will also result in a proper hardware description in the code.
> > > 
> > 
> > I'm now also vaguely recalling that Stephen Warren had some kind of a "code generator"
> > for the pinctrl drivers. So I guess all those tables were auto-generated initially.
> > 
> > Stephen, maybe you could adjust the generator to take into account the bitmask (of
> > course if that's a part of the generated code) and then re-gen it all for Sowjanya?
> 
> https://github.com/NVIDIA/tegra-pinmux-scripts holds the scripts that
> generate tegra-pinctrlNNN.c. See  	soc-to-kernel-pinctrl-driver.py. IIRC,
> tegra-pinctrl.c (the core file) isn't auto-generated. Sowjanya is welcome to
> send a patch to that repo if the code needs to be updated.

If we want to do that, we may need to start off by bringing the pinmux
scripts up to date with the latest version of the generated files. There
have been a number of changes in the meantime that cause the scripts to
generate a bit of diff with regards to what's currently upstream. Sounds
like something fairly trivial, though.

Thierry

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