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

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Date:   Tue, 18 Jun 2019 12:30:39 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com,
        Stephen Warren <swarren@...dotorg.org>
Cc:     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

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?