linux-kernel - Re: [PATCH v5 2/7] phy: qcom-qmp: Enable pipe

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Message-ID: <CAD=FV=XqRLLeFOfFZWscZf0U_y4_HHeGQMpEcS3FPCX6_YMcvw@mail.gmail.com>
Date:   Fri, 4 May 2018 12:47:01 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Manu Gautam <mgautam@...eaurora.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Evan Green <evgreen@...omium.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v5 2/7] phy: qcom-qmp: Enable pipe_clk before PHY initialization

Hi,

On Wed, May 2, 2018 at 2:06 PM, Manu Gautam <mgautam@...eaurora.org> wrote:
> QMP PHY for USB/PCIE requires pipe_clk for locking of
> retime buffers at the pipe interface. Driver checks for
> PHY_STATUS without enabling pipe_clk due to which
> phy_init() fails with initialization timeout.
> Though pipe_clk is output from PHY (after PLL is programmed
> during initialization sequence) to GCC clock_ctl and then fed
> back to PHY but for PHY_STATUS register to reflect successful
> initialization pipe_clk from GCC must be present.
> Since, clock driver now ignores status_check for pipe_clk on
> clk_enable/disable, driver can safely enable/disable pipe_clk
> from phy_init/exit.
>
> Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)

Given the agreement with Stephen Boyd that we'll just BRANCH_HALT_SKIP
for now, this all looks good to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>