linux-kernel - Re: [PATCH v6 1/3] phy: Update PHY power control sequence

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Message-ID: <7b5f62c60cc3a2c3b9d7c4e99dcde01b@codeaurora.org>
Date:   Tue, 12 Jun 2018 08:27:34 +0800
From:   cang@...eaurora.org
To:     Manu Gautam <mgautam@...eaurora.org>
Cc:     subhashj@...eaurora.org, asutoshd@...eaurora.org,
        vivek.gautam@...eaurora.org, kishon@...com, robh+dt@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 1/3] phy: Update PHY power control sequence

On 2018-06-08 14:45, Manu Gautam wrote:
> Hi,
> 
> On 5/29/2018 10:07 AM, Can Guo wrote:
>> All PHYs should be powered on before register configuration starts. 
>> And
>> only PCIe PHYs need an extra power control before deasserts reset 
>> state.
>> 
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> ---
>>  drivers/phy/qualcomm/phy-qcom-qmp.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c 
>> b/drivers/phy/qualcomm/phy-qcom-qmp.c
>> index 97ef942..f779b0f 100644
>> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
>> @@ -982,6 +982,8 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp 
>> *qmp)
>>  	if (cfg->has_phy_com_ctrl)
>>  		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
>>  			     SW_PWRDN);
>> +	else
>> +		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
> 
> We should power-up PHYs after following dp_com_ctrl programming which
> powers-off USB-DP combo PHY when it brings DP_COM block out of reset 
> reset.
> 
> 

Sure Manu

>> 
>>  	if (cfg->has_phy_dp_com_ctrl) {
>>  		qphy_setbits(dp_com, QPHY_V3_DP_COM_POWER_DOWN_CTRL,
>> @@ -1127,7 +1129,8 @@ static int qcom_qmp_phy_init(struct phy *phy)
>>  	 * Pull out PHY from POWER DOWN state.
>>  	 * This is active low enable signal to power-down PHY.
>>  	 */
>> -	qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
>> +	if (cfg->type == PHY_TYPE_PCIE)
>> +		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
>> 
>>  	if (cfg->has_pwrdn_delay)
>>  		usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);