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Mon, 23 Dec 2019 09:02:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 3C3A1C433CB Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=mgautam@codeaurora.org Subject: Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset To: cang@codeaurora.org, Vinod Koul Cc: Asutosh Das , Kishon Vijay Abraham I , linux-arm-msm@vger.kernel.org, Bjorn Andersson , Andy Gross , Jeffrey Hugo , linux-kernel@vger.kernel.org References: <20191219150433.2785427-1-vkoul@kernel.org> <20191219150433.2785427-4-vkoul@kernel.org> <9ef99dcac59dbdc59c7e5eb1a8724ea2@codeaurora.org> From: Manu Gautam Message-ID: <9535bad2-4870-ce6b-fe51-2a24a6e922c7@codeaurora.org> Date: Mon, 23 Dec 2019 14:32:57 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <9ef99dcac59dbdc59c7e5eb1a8724ea2@codeaurora.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/20/2019 6:19 AM, cang@codeaurora.org wrote: > On 2019-12-20 08:22, cang@codeaurora.org wrote: >> On 2019-12-19 23:04, Vinod Koul wrote: >>> For V4 QMP UFS Phy, we need to assert reset bits, configure the phy and >>> then deassert it, so add optional has_sw_reset flag and use that to >>> configure the QPHY_SW_RESET register. >>> >>> Signed-off-by: Vinod Koul >>> --- >>>  drivers/phy/qualcomm/phy-qcom-qmp.c | 10 ++++++++++ >>>  1 file changed, 10 insertions(+) >>> >>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c >>> b/drivers/phy/qualcomm/phy-qcom-qmp.c >>> index 06f971ca518e..80304b7cd895 100644 >>> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c >>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c >>> @@ -1023,6 +1023,9 @@ struct qmp_phy_cfg { >>> >>>      /* true, if PCS block has no separate SW_RESET register */ >>>      bool no_pcs_sw_reset; >>> + >>> +    /* true if sw reset needs to be invoked */ >>> +    bool has_sw_reset; >>>  }; >>> >>>  /** >>> @@ -1391,6 +1394,7 @@ static const struct qmp_phy_cfg sm8150_ufsphy_cfg = { >>> >>>      .is_dual_lane_phy    = true, >>>      .no_pcs_sw_reset    = true, >>> +    .has_sw_reset        = true, >>>  }; >>> >>>  static void qcom_qmp_phy_configure(void __iomem *base, >>> @@ -1475,6 +1479,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy) >>>                   SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET); >>>      } >>> >>> +    if (cfg->has_sw_reset) >>> +        qphy_setbits(serdes, cfg->regs[QPHY_SW_RESET], SW_RESET); >>> + >> >> Are you sure you want to set this in the serdes register? QPHY_SW_RESET >> is in its pcs register. >> >>>      if (cfg->has_phy_com_ctrl) >>>          qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL], >>>                   SW_PWRDN); >>> @@ -1651,6 +1658,9 @@ static int qcom_qmp_phy_enable(struct phy *phy) >>>      if (cfg->has_phy_dp_com_ctrl) >>>          qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET); >>> >>> +    if (cfg->has_sw_reset) >>> +        qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET); >>> + >> >> Yet you are clearing it from pcs register. >> >> Regards, >> Can Guo >> >>>      /* start SerDes and Phy-Coding-Sublayer */ >>>      qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl); > > I thought your change would be like this > > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c > index 8e642a6..a4ab4b7 100755 > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c > @@ -166,6 +166,7 @@ static const unsigned int sdm845_ufsphy_regs_layout[] = { >  }; > >  static const unsigned int sm8150_ufsphy_regs_layout[] = { > +       [QPHY_SW_RESET]                 = 0x08, >         [QPHY_START_CTRL]               = 0x00, >         [QPHY_PCS_READY_STATUS]         = 0x180, >  }; > @@ -1390,7 +1391,6 @@ static const struct qmp_phy_cfg sm8150_ufsphy_cfg = { >         .pwrdn_ctrl             = SW_PWRDN, > >         .is_dual_lane_phy       = true, > -       .no_pcs_sw_reset        = true, This makes sense to me. >  }; > >  static void qcom_qmp_phy_configure(void __iomem *base, > @@ -1475,6 +1475,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy) >                              SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET); >         } > > +       if ((cfg->type == PHY_TYPE_UFS) && (!cfg->no_pcs_sw_reset)) > +               qphy_setbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET); > + This change is not needed as POR value of SW_RESET bit is '1' which will be set as part of GCC or clk_reset. We just need to clear this bit which code already takes care of. >         if (cfg->has_phy_com_ctrl) >                 qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL], >                              SW_PWRDN); > > Regards, > Can Guo. -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project