Re: [PATCH 05/40] soc/tegra: pmc: Fix pad voltage configuration for Tegra186

[Thierry Reding]

On Wed, Aug 01, 2018 at 07:31:55PM +0300, Aapo Vienamo wrote:
> Implement support for the PMC_IMPL_E_33V_PWR register which replaces
> PMC_PWR_DET register interface of the SoC generations preceding
> Tegra186. Also add the voltage bit offsets to the tegra186_io_pads[]
> table and the AO_HV pad.
> 
> Signed-off-by: Aapo Vienamo <avienamo@xxxxxxxxxx>
> Acked-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> ---
>  drivers/soc/tegra/pmc.c | 55 ++++++++++++++++++++++++++++++++++---------------
>  include/soc/tegra/pmc.h |  1 +
>  2 files changed, 39 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 2d6f3fc..f926332 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -65,6 +65,8 @@
>  
>  #define PWRGATE_STATUS			0x38
>  
> +#define PMC_IMPL_E_33V_PWR		0x40
> +
>  #define PMC_PWR_DET			0x48
>  
>  #define PMC_SCRATCH0_MODE_RECOVERY	BIT(31)
> @@ -154,6 +156,7 @@ struct tegra_pmc_soc {
>  	bool has_tsense_reset;
>  	bool has_gpu_clamps;
>  	bool needs_mbist_war;
> +	bool has_impl_33v_pwr;
>  
>  	const struct tegra_io_pad_soc *io_pads;
>  	unsigned int num_io_pads;
> @@ -1073,20 +1076,29 @@ int tegra_io_pad_set_voltage(enum tegra_io_pad id,
>  
>  	mutex_lock(&pmc->powergates_lock);
>  
> -	/* write-enable PMC_PWR_DET_VALUE[pad->voltage] */
> -	value = tegra_pmc_readl(PMC_PWR_DET);
> -	value |= BIT(pad->voltage);
> -	tegra_pmc_writel(value, PMC_PWR_DET);
> +	if (pmc->soc->has_impl_33v_pwr) {
> +		value = tegra_pmc_readl(PMC_IMPL_E_33V_PWR);
> +		if (voltage == TEGRA_IO_PAD_1800000UV)
> +			value &= ~BIT(pad->voltage);
> +		else
> +			value |= BIT(pad->voltage);

Nit: blank lines surrounding the if ... else ... block might improve
readability of this a little.

Thierry

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