linux-kernel - Re: [PATCH v2 3/7] phy: qcom: qmp-combo: introduce QPHY

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Date: Mon, 27 May 2024 10:48:12 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] phy: qcom: qmp-combo: introduce QPHY_MODE

On 27/05/2024 10:46, Dmitry Baryshkov wrote:
> On Mon, May 27, 2024 at 10:42:35AM +0200, Neil Armstrong wrote:
>> Introduce an enum for the QMP Combo PHY modes, use it in the
>> QMP commmon phy init function and default to COMBO mode.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>>   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 41 +++++++++++++++++++++++++++----
>>   1 file changed, 36 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
>> index 183cd9cd1884..788e4c05eaf2 100644
>> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
>> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
>> @@ -61,6 +61,12 @@
>>   
>>   #define PHY_INIT_COMPLETE_TIMEOUT		10000
>>   
>> +enum qphy_mode {
>> +	QPHY_MODE_COMBO = 0,
>> +	QPHY_MODE_DP_ONLY,
>> +	QPHY_MODE_USB_ONLY,
>> +};
>> +
>>   /* set of registers with offsets different per-PHY */
>>   enum qphy_reg_layout {
>>   	/* PCS registers */
>> @@ -1503,6 +1509,7 @@ struct qmp_combo {
>>   
>>   	struct mutex phy_mutex;
>>   	int init_count;
>> +	enum qphy_mode init_mode;
>>   
>>   	struct phy *usb_phy;
>>   	enum phy_mode mode;
>> @@ -2589,12 +2596,33 @@ static int qmp_combo_com_init(struct qmp_combo *qmp, bool force)
>>   	if (qmp->orientation == TYPEC_ORIENTATION_REVERSE)
>>   		val |= SW_PORTSELECT_VAL;
>>   	writel(val, com + QPHY_V3_DP_COM_TYPEC_CTRL);
>> -	writel(USB3_MODE | DP_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
>>   
>> -	/* bring both QMP USB and QMP DP PHYs PCS block out of reset */
>> -	qphy_clrbits(com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
>> -			SW_DPPHY_RESET_MUX | SW_DPPHY_RESET |
>> -			SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
>> +	switch (qmp->init_mode) {
>> +	case QPHY_MODE_COMBO:
>> +		writel(USB3_MODE | DP_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
>> +
>> +		/* bring both QMP USB and QMP DP PHYs PCS block out of reset */
>> +		qphy_clrbits(com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
>> +				SW_DPPHY_RESET_MUX | SW_DPPHY_RESET |
>> +				SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
>> +		break;
>> +
>> +	case QPHY_MODE_DP_ONLY:
>> +		writel(DP_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
>> +
>> +		/* bring QMP DP PHY PCS block out of reset */
>> +		qphy_clrbits(com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
>> +				SW_DPPHY_RESET_MUX | SW_DPPHY_RESET);
>> +		break;
>> +
>> +	case QPHY_MODE_USB_ONLY:
>> +		writel(USB3_MODE, com + QPHY_V3_DP_COM_PHY_MODE_CTRL);
>> +
>> +		/* bring QMP USB PHY PCS block out of reset */
>> +		qphy_clrbits(com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
>> +				SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
>> +		break;
>> +	}
>>   
>>   	qphy_clrbits(com, QPHY_V3_DP_COM_SWI_CTRL, 0x03);
>>   	qphy_clrbits(com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
>> @@ -3603,6 +3631,9 @@ static int qmp_combo_probe(struct platform_device *pdev)
>>   	if (ret)
>>   		goto err_node_put;
>>   
>> +	/* Set PHY_MODE as combo by default */
>> +	qmp->init_mode = QPHY_MODE_COMBO;
>> +
> 
> I see that COMBO mode is backwards compatible with existing code. But
> shouldn't the USB-only be a default mode?

No because it would break existing platforms without "mode-switch" in DT.

Neil

> 
>>   	qmp->usb_phy = devm_phy_create(dev, usb_np, &qmp_combo_usb_phy_ops);
>>   	if (IS_ERR(qmp->usb_phy)) {
>>   		ret = PTR_ERR(qmp->usb_phy);
>>
>> -- 
>> 2.34.1
>>
>