linux-kernel - Re: [PATCH] phy: qcom: qmp-combo: Fix register base for QSERDES_DP_PHY

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Message-ID: <Zg9MQOAZpsndSNtb@hu-bjorande-lv.qualcomm.com>
Date: Thu, 4 Apr 2024 17:56:32 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Stephen Boyd <swboyd@...omium.org>
CC: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
        <linux-kernel@...r.kernel.org>, <patches@...ts.linux.dev>,
        <linux-arm-msm@...r.kernel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        <linux-phy@...ts.infradead.org>, <freedreno@...ts.freedesktop.org>,
        "Douglas
 Anderson" <dianders@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        "Steev
 Klimaszewski" <steev@...i.org>,
        Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH] phy: qcom: qmp-combo: Fix register base for
 QSERDES_DP_PHY_MODE

On Thu, Apr 04, 2024 at 05:01:03PM -0700, Stephen Boyd wrote:
> The register base that was used to write to the QSERDES_DP_PHY_MODE
> register was 'dp_dp_phy' before commit 815891eee668 ("phy:
> qcom-qmp-combo: Introduce orientation variable"). There isn't any
> explanation in the commit why this is changed, so I suspect it was an
> oversight or happened while being extracted from some other series.

Thanks for catching that, I wrote that patch long before Johan did the
rename of "pcs" to "dp_dp_phy", and must have missed that while later
rebasing the patch.

Reviewed-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Regards,
Bjorn

> Oddly the value being 0x4c or 0x5c doesn't seem to matter for me, so I
> suspect this is dead code, but that can be fixed in another patch. It's
> not good to write to the wrong register space, and maybe some other
> version of this phy relies on this.
> 
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Neil Armstrong <neil.armstrong@...aro.org>
> Cc: Abel Vesa <abel.vesa@...aro.org>
> Cc: Steev Klimaszewski <steev@...i.org>
> Cc: Johan Hovold <johan+linaro@...nel.org>
> Cc: Bjorn Andersson <quic_bjorande@...cinc.com>
> Fixes: 815891eee668 ("phy: qcom-qmp-combo: Introduce orientation variable")
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 7d585a4bbbba..746d009d702b 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2150,9 +2150,9 @@ static bool qmp_combo_configure_dp_mode(struct qmp_combo *qmp)
>  	writel(val, qmp->dp_dp_phy + QSERDES_DP_PHY_PD_CTL);
>  
>  	if (reverse)
> -		writel(0x4c, qmp->pcs + QSERDES_DP_PHY_MODE);
> +		writel(0x4c, qmp->dp_dp_phy + QSERDES_DP_PHY_MODE);
>  	else
> -		writel(0x5c, qmp->pcs + QSERDES_DP_PHY_MODE);
> +		writel(0x5c, qmp->dp_dp_phy + QSERDES_DP_PHY_MODE);
>  
>  	return reverse;
>  }
> 
> base-commit: 4cece764965020c22cff7665b18a012006359095
> -- 
> https://chromeos.dev
>