linux-kernel - Re: [PATCH 1/2] phy: qcom-qmp-combo: Square out 8550 POWER_STATE

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Date:   Fri, 1 Sep 2023 20:30:15 +0300
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     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>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] phy: qcom-qmp-combo: Square out 8550
 POWER_STATE_CONFIG1

On 23-08-29 22:59:04, Konrad Dybcio wrote:
> There are two instances of the POWER_STATE_CONFIG1 register: one in
> the PCS space and another one in PCS_USB.
> 
> The downstream init sequence pokes the latter one while we've been poking
> the former one (and misnamed it as the latter one, impostor!). Fix that
> up to avoid UB.
> 
> Fixes: 49742e9edab3 ("phy: qcom-qmp-combo: Add support for SM8550")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c      | 2 +-
>  drivers/phy/qualcomm/phy-qcom-qmp-pcs-usb-v6.h | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index cbb28afce135..843099d314bf 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -859,10 +859,10 @@ static const struct qmp_phy_init_tbl sm8550_usb3_pcs_tbl[] = {
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_PCS_TX_RX_CONFIG, 0x0c),
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_EQ_CONFIG1, 0x4b),
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_EQ_CONFIG5, 0x10),
> -	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_USB3_POWER_STATE_CONFIG1, 0x68),
>  };
>  
>  static const struct qmp_phy_init_tbl sm8550_usb3_pcs_usb_tbl[] = {
> +	QMP_PHY_INIT_CFG(QPHY_USB_Q6_PCS_USB3_POWER_STATE_CONFIG1, 0x68),
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_USB3_LFPS_DET_HIGH_COUNT_VAL, 0xf8),
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_USB3_RXEQTRAINING_DFE_TIME_S2, 0x07),
>  	QMP_PHY_INIT_CFG(QPHY_USB_V6_PCS_USB3_RCVR_DTCT_DLY_U3_L, 0x40),
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-usb-v6.h b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-usb-v6.h
> index 9510e63ba9d8..b9060c242fd2 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-usb-v6.h
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-usb-v6.h
> @@ -12,7 +12,7 @@
>  #define QPHY_USB_V6_PCS_LOCK_DETECT_CONFIG3		0xcc
>  #define QPHY_USB_V6_PCS_LOCK_DETECT_CONFIG6		0xd8
>  #define QPHY_USB_V6_PCS_REFGEN_REQ_CONFIG1		0xdc
> -#define QPHY_USB_V6_PCS_USB3_POWER_STATE_CONFIG1	0x90
> +#define QPHY_USB_V6_PCS_POWER_STATE_CONFIG1		0x90
>  #define QPHY_USB_V6_PCS_RX_SIGDET_LVL			0x188
>  #define QPHY_USB_V6_PCS_RCVR_DTCT_DLY_P1U2_L		0x190
>  #define QPHY_USB_V6_PCS_RCVR_DTCT_DLY_P1U2_H		0x194
> @@ -23,6 +23,7 @@
>  #define QPHY_USB_V6_PCS_EQ_CONFIG1			0x1dc
>  #define QPHY_USB_V6_PCS_EQ_CONFIG5			0x1ec
>  
> +#define QPHY_USB_Q6_PCS_USB3_POWER_STATE_CONFIG1	0x00
>  #define QPHY_USB_V6_PCS_USB3_LFPS_DET_HIGH_COUNT_VAL	0x18
>  #define QPHY_USB_V6_PCS_USB3_RXEQTRAINING_DFE_TIME_S2	0x3c
>  #define QPHY_USB_V6_PCS_USB3_RCVR_DTCT_DLY_U3_L		0x40
> 
> -- 
> 2.42.0
>