linux-kernel - Re: [PATCH 07/13] phy: qcom-qmp-pcie: clean up power-down handling

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Message-ID: <c3d39c4e-2099-b09a-8486-8abae7336611@linaro.org>
Date:   Wed, 28 Sep 2022 22:15:46 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/13] phy: qcom-qmp-pcie: clean up power-down handling

On 28/09/2022 18:28, Johan Hovold wrote:
> Always define the POWER_DOWN_CONTROL register instead of falling back to
> the v2 offset during power on and power off.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 20 ++++++--------------
>   1 file changed, 6 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index eea66c24cf7e..47cdb9ed80cd 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> @@ -90,12 +90,14 @@ static const unsigned int pciephy_regs_layout[QPHY_LAYOUT_SIZE] = {
>   	[QPHY_SW_RESET]			= 0x00,
>   	[QPHY_START_CTRL]		= 0x08,
>   	[QPHY_PCS_STATUS]		= 0x174,
> +	[QPHY_PCS_POWER_DOWN_CONTROL]	= 0x04,
>   };

Without symbolic names it's not obvious that 0x04 (and thus this 
regs_layout) can be used for v2 and v3, but not for v4.

>   
>   static const unsigned int sdm845_qhp_pciephy_regs_layout[QPHY_LAYOUT_SIZE] = {
>   	[QPHY_SW_RESET]			= 0x00,
>   	[QPHY_START_CTRL]		= 0x08,
>   	[QPHY_PCS_STATUS]		= 0x2ac,
> +	[QPHY_PCS_POWER_DOWN_CONTROL]	= 0x04,
>   };
>   
>   static const unsigned int sm8250_pcie_regs_layout[QPHY_LAYOUT_SIZE] = {
> @@ -1872,13 +1874,8 @@ static int qmp_pcie_init(struct phy *phy)
>   	if (ret)
>   		goto err_assert_reset;
>   
> -	if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL])
> -		qphy_setbits(pcs,
> -				cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> -				cfg->pwrdn_ctrl);
> -	else
> -		qphy_setbits(pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL,
> -				cfg->pwrdn_ctrl);
> +	qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> +			cfg->pwrdn_ctrl);
>   
>   	return 0;
>   
> @@ -1995,13 +1992,8 @@ static int qmp_pcie_power_off(struct phy *phy)
>   	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
>   
>   	/* Put PHY into POWER DOWN state: active low */
> -	if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL]) {
> -		qphy_clrbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> -			     cfg->pwrdn_ctrl);
> -	} else {
> -		qphy_clrbits(qphy->pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL,
> -				cfg->pwrdn_ctrl);
> -	}
> +	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
> +			cfg->pwrdn_ctrl);
>   
>   	return 0;
>   }

-- 
With best wishes
Dmitry