linux-kernel - Re: [PATCH v3 05/15] phy: tegra: xusb: Rearrange UPHY init on Tegra210

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Message-ID: <20200928130849.GF3065790@ulmo>
Date:   Mon, 28 Sep 2020 15:08:49 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     JC Kuo <jckuo@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh@...nel.org, jonathanh@...dia.com,
        kishon@...com, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nkristam@...dia.com
Subject: Re: [PATCH v3 05/15] phy: tegra: xusb: Rearrange UPHY init on
 Tegra210

On Wed, Sep 09, 2020 at 04:10:31PM +0800, JC Kuo wrote:
> This commit is a preparation for enabling XUSB SC7 support.
> It rearranges Tegra210 XUSB PADCTL UPHY initialization sequence,
> for the following reasons:
> 
> 1. PLLE hardware power sequencer has to be enabled only after both
>    PEX UPHY PLL and SATA UPHY PLL are initialized.
>    tegra210_uphy_init() -> tegra210_pex_uphy_enable()
>                         -> tegra210_sata_uphy_enable()
>                         -> tegra210_plle_hw_sequence_start()
>                         -> tegra210_aux_mux_lp0_clamp_disable()
> 
> 2. At cold boot and SC7 exit, the following bits must be cleared after
>    PEX/SATA lanes are out of IDDQ (IDDQ_DISABLE=1).
>    a. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN,
>    b. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN_EARLY
>    c. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_VCORE_DOWN
> 
>    tegra210_pex_uphy_enable() and tegra210_sata_uphy_enable() are in
>    charge of bringing lanes out of IDDQ, and then AUX_MUX_LP0_* bits
>    will be cleared by tegra210_aux_mux_lp0_clamp_disable().
> 
> Signed-off-by: JC Kuo <jckuo@...dia.com>
> ---
> v3:
>    make separate changes
>    use "unsigned int" instead "int" type for PHY index
>    add blank line for better readability
>    
>  drivers/phy/tegra/xusb-tegra210.c | 203 +++++++++++++++---------------
>  drivers/phy/tegra/xusb.h          |   4 +-
>  2 files changed, 102 insertions(+), 105 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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