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

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Message-ID: <v36mrliwd7rarqofbitv5mtb6kd3n3hmuwp6bgg67krnvzejd6@luityjlkb7nn>
Date: Mon, 27 May 2024 11:46:29 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Neil Armstrong <neil.armstrong@...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 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?

>  	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
> 

-- 
With best wishes
Dmitry