linux-kernel - Re: [PATCH] phy: qcom: qmp-combo: fix Display Port PHY configuration for SM8550

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Date:   Thu, 1 Jun 2023 11:42:01 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Abel Vesa <abel.vesa@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom: qmp-combo: fix Display Port PHY configuration
 for SM8550



On 1.06.2023 11:39, Neil Armstrong wrote:
> The SM8550 PHY also uses a different offset for the CMN_STATUS reg,
> use the right one for the v6 Display Port configuration.
> 
> Fixes: 49742e9edab3 ("phy: qcom-qmp-combo: Add support for SM8550")
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
Must have been fun to debug.. 

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 33cc99d9c77d..bebce8c591a3 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2151,6 +2151,7 @@ static void qmp_v4_configure_dp_tx(struct qmp_combo *qmp)
>  static int qmp_v456_configure_dp_phy(struct qmp_combo *qmp,
>  				     unsigned int com_resetm_ctrl_reg,
>  				     unsigned int com_c_ready_status_reg,
> +				     unsigned int com_cmn_status_reg,
>  				     unsigned int dp_phy_status_reg)
>  {
>  	const struct phy_configure_opts_dp *dp_opts = &qmp->dp_opts;
> @@ -2207,14 +2208,14 @@ static int qmp_v456_configure_dp_phy(struct qmp_combo *qmp,
>  			10000))
>  		return -ETIMEDOUT;
>  
> -	if (readl_poll_timeout(qmp->dp_serdes + QSERDES_V4_COM_CMN_STATUS,
> +	if (readl_poll_timeout(qmp->dp_serdes + com_cmn_status_reg,
>  			status,
>  			((status & BIT(0)) > 0),
>  			500,
>  			10000))
>  		return -ETIMEDOUT;
>  
> -	if (readl_poll_timeout(qmp->dp_serdes + QSERDES_V4_COM_CMN_STATUS,
> +	if (readl_poll_timeout(qmp->dp_serdes + com_cmn_status_reg,
>  			status,
>  			((status & BIT(1)) > 0),
>  			500,
> @@ -2250,6 +2251,7 @@ static int qmp_v4_configure_dp_phy(struct qmp_combo *qmp)
>  
>  	ret = qmp_v456_configure_dp_phy(qmp, QSERDES_V4_COM_RESETSM_CNTRL,
>  					QSERDES_V4_COM_C_READY_STATUS,
> +					QSERDES_V4_COM_CMN_STATUS,
>  					QSERDES_V4_DP_PHY_STATUS);
>  	if (ret < 0)
>  		return ret;
> @@ -2314,6 +2316,7 @@ static int qmp_v5_configure_dp_phy(struct qmp_combo *qmp)
>  
>  	ret = qmp_v456_configure_dp_phy(qmp, QSERDES_V4_COM_RESETSM_CNTRL,
>  					QSERDES_V4_COM_C_READY_STATUS,
> +					QSERDES_V4_COM_CMN_STATUS,
>  					QSERDES_V4_DP_PHY_STATUS);
>  	if (ret < 0)
>  		return ret;
> @@ -2373,6 +2376,7 @@ static int qmp_v6_configure_dp_phy(struct qmp_combo *qmp)
>  
>  	ret = qmp_v456_configure_dp_phy(qmp, QSERDES_V6_COM_RESETSM_CNTRL,
>  					QSERDES_V6_COM_C_READY_STATUS,
> +					QSERDES_V6_COM_CMN_STATUS,
>  					QSERDES_V6_DP_PHY_STATUS);
>  	if (ret < 0)
>  		return ret;
> 
> ---
> base-commit: d4cee89031c80066ec461bb77b5e13a4f37d5fd2
> change-id: 20230601-topic-sm8550-upstream-dp-phy-init-fix-ed90c001592d
> 
> Best regards,