linux-kernel - Re: [PATCH] phy: rockchip: usbdp: Check these parameters only when the corresponding set flags are set

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Message-ID: <Z86UOmPg/UDSBajZ@vaman>
Date: Mon, 10 Mar 2025 12:56:50 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Andy Yan <andyshrk@....com>
Cc: heiko@...ech.de, kishon@...nel.org, sebastian.reichel@...labora.com,
	yubing.zhang@...k-chips.com, dmitry.baryshkov@...aro.org,
	frank.wang@...k-chips.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH] phy: rockchip: usbdp: Check these parameters only when
 the corresponding set flags are set

On 06-03-25, 14:59, Andy Yan wrote:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> According documentation of phy_configure_opts_dp, at the configure
> stage, we should only verify/configure the link_rate when set_rate
> flag is set, the same applies to lanes and voltage.
> 
> So we do it as the documentation says, also record the link rate
> and lanes in phy internal for set_voltate stage.

Whenever you say also, that is a sign that it should be another patch!

> 
> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> ---
> 
>  drivers/phy/rockchip/phy-rockchip-usbdp.c | 63 +++++++++++------------
>  1 file changed, 31 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-usbdp.c b/drivers/phy/rockchip/phy-rockchip-usbdp.c
> index c04cf64f8a35..d1bbdf382aa2 100644
> --- a/drivers/phy/rockchip/phy-rockchip-usbdp.c
> +++ b/drivers/phy/rockchip/phy-rockchip-usbdp.c
> @@ -187,6 +187,8 @@ struct rk_udphy {
>  	u32 dp_aux_din_sel;
>  	bool dp_sink_hpd_sel;
>  	bool dp_sink_hpd_cfg;
> +	unsigned int link_rate;
> +	unsigned int lanes;
>  	u8 bw;
>  	int id;
>  
> @@ -1102,42 +1104,39 @@ static int rk_udphy_dp_phy_power_off(struct phy *phy)
>  	return 0;
>  }
>  
> -static int rk_udphy_dp_phy_verify_link_rate(unsigned int link_rate)
> -{
> -	switch (link_rate) {
> -	case 1620:
> -	case 2700:
> -	case 5400:
> -	case 8100:
> -		break;
> -
> -	default:
> -		return -EINVAL;
> -	}
> -
> -	return 0;
> -}
> -
>  static int rk_udphy_dp_phy_verify_config(struct rk_udphy *udphy,
>  					 struct phy_configure_opts_dp *dp)
>  {
> -	int i, ret;
> +	int i;
>  
> -	/* If changing link rate was required, verify it's supported. */
> -	ret = rk_udphy_dp_phy_verify_link_rate(dp->link_rate);
> -	if (ret)
> -		return ret;
> +	/* Verify link rate. */
> +	if (dp->set_rate) {
> +		switch (dp->link_rate) {
> +		case 1620:
> +		case 2700:
> +		case 5400:
> +		case 8100:
> +			udphy->link_rate = dp->link_rate;
> +			break;
> +
> +		default:
> +			return -EINVAL;
> +		}

why drop helper? Why not set the rate on success?

> +	}
>  
>  	/* Verify lane count. */
> -	switch (dp->lanes) {
> -	case 1:
> -	case 2:
> -	case 4:
> -		/* valid lane count. */
> -		break;
> +	if (dp->set_lanes) {
> +		switch (dp->lanes) {
> +		case 1:
> +		case 2:
> +		case 4:
> +			/* valid lane count. */
> +			udphy->lanes = dp->lanes;
> +			break;
>  
> -	default:
> -		return -EINVAL;
> +		default:
> +			return -EINVAL;
> +		}

another change where helper would have made this look better

>  	}
>  
>  	/*
> @@ -1146,7 +1145,7 @@ static int rk_udphy_dp_phy_verify_config(struct rk_udphy *udphy,
>  	 */
>  	if (dp->set_voltages) {
>  		/* Lane count verified previously. */
> -		for (i = 0; i < dp->lanes; i++) {
> +		for (i = 0; i < udphy->lanes; i++) {
>  			if (dp->voltage[i] > 3 || dp->pre[i] > 3)
>  				return -EINVAL;
>  
> @@ -1243,9 +1242,9 @@ static int rk_udphy_dp_phy_configure(struct phy *phy,
>  	}
>  
>  	if (dp->set_voltages) {
> -		for (i = 0; i < dp->lanes; i++) {
> +		for (i = 0; i < udphy->lanes; i++) {
>  			lane = udphy->dp_lane_sel[i];
> -			switch (dp->link_rate) {
> +			switch (udphy->link_rate) {
>  			case 1620:
>  			case 2700:
>  				regmap_update_bits(udphy->pma_regmap,
> -- 
> 2.34.1

-- 
~Vinod