linux-kernel - Re: [PATCH v4 3/3] ata: ahci_tegra: Add AHCI support for Tegra186

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Message-ID: <594c622e-4505-3448-1c7b-eae8f36cbad8@gmail.com>
Date:   Thu, 8 Apr 2021 00:36:13 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>, axboe@...nel.dk,
        thierry.reding@...il.com, jonathanh@...dia.com, robh+dt@...nel.org
Cc:     pchandru@...dia.com, devicetree@...r.kernel.org,
        linux-ide@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] ata: ahci_tegra: Add AHCI support for Tegra186

07.04.2021 04:25, Sowjanya Komatineni пишет:
> +	if (!tegra->pdev->dev.pm_domain) {
> +		ret = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_SATA,
> +							tegra->sata_clk,
> +							tegra->sata_rst);
> +		if (ret)
> +			goto disable_regulators;
> +	}
>  

Hi,

Why you haven't added condition for tegra_powergate_power_off()? I think
it should break GENPD and legacy PD API isn't not supported by T186 at all.

I'm also not sure whether the power up/down sequence is correct using GENPD.

Moreover the driver doesn't support runtime PM, so GENPD should be
always off?