linux-kernel - Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

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Date:   Fri, 20 Dec 2019 08:49:53 +0800
From:   cang@...eaurora.org
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Asutosh Das <asutoshd@...eaurora.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

On 2019-12-20 08:22, cang@...eaurora.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 <vkoul@...nel.org>
>> ---
>>  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,
  };

  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);
+
         if (cfg->has_phy_com_ctrl)
                 qphy_setbits(serdes, 
cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
                              SW_PWRDN);

Regards,
Can Guo.