linux-kernel - Re: [PATCH v2 2/2] phy: qcom: Introduce new eDP PHY driver

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Message-ID: <4ec86f4c-8c7c-d654-2cfe-9d879fe24950@linaro.org>
Date:   Sun, 17 Oct 2021 02:45:33 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>, linux-phy@...ts.infradead.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v2 2/2] phy: qcom: Introduce new eDP PHY driver

On 17/10/2021 02:09, Bjorn Andersson wrote:
> On Sat 16 Oct 11:36 CDT 2021, Dmitry Baryshkov wrote:
> 
>> On Sat, 16 Oct 2021 at 01:11, Bjorn Andersson
>> <bjorn.andersson@...aro.org> wrote:
> [..]
>>> diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> [..]
>>> +#define QSERDES_COM_SSC_EN_CENTER               0x0010
>>> +#define QSERDES_COM_SSC_ADJ_PER1                0x0014
>>> +#define QSERDES_COM_SSC_PER1                    0x001c
>>> +#define QSERDES_COM_SSC_PER2                    0x0020
>>> +#define QSERDES_COM_SSC_STEP_SIZE1_MODE0        0x0024
>>> +#define QSERDES_COM_SSC_STEP_SIZE2_MODE0        0x0028
>>
>> I think we might want to use register definitions from phy-qcom-qmp.h,
>> so that it would be obvious, which generations are handled by the
>> driver.
>>
> 
> I reviewed the all the registers and concluded that the QSERDES is V4,
> so I included phy-qcom-qmp.h and used the SERDES_V4 defines instead.
> 
> The registers found in the PHY and LANE_TX blocks are specific to this
> PHY, so I'm keeping these here.

Yep. They look like V4 DP_PHY registers, but with one extra register 
inserted in the middle.


-- 
With best wishes
Dmitry