linux-kernel - Re: [PATCH 16/20] phy: qcom-qmp-pcie: drop start-ctrl abstraction

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Date:   Thu, 13 Oct 2022 00:20:10 +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 16/20] phy: qcom-qmp-pcie: drop start-ctrl abstraction

On 12/10/2022 11:49, Johan Hovold wrote:
> All PCIe PHYs need to start and stop the SerDes and PCS so drop the
> start-ctrl abstraction which is no longer needed since the QMP driver
> split.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 18 +++---------------
>   1 file changed, 3 insertions(+), 15 deletions(-)

I think it should be possible to also drop the pwrdn_ctrl by replacing 
it with something like no_refclk_drv_dsbl. However I'd like to 
understand why this is not required for SDX55. Is this the peculiarity 
of that platform? Or is it a specifics of the EP mode?
Many, Vinod, do you know the answer by chance?

Nevertheless, for this patch:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index d3e7e673114f..5534a4ad0243 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> @@ -1355,7 +1355,6 @@ struct qmp_phy_cfg {
>   	/* array of registers with different offsets */
>   	const unsigned int *regs;
>   
> -	unsigned int start_ctrl;
>   	unsigned int pwrdn_ctrl;
>   	/* bit offset of PHYSTATUS in QPHY_PCS_STATUS register */
>   	unsigned int phy_status;
> @@ -1491,7 +1490,6 @@ static const struct qmp_phy_cfg ipq8074_pciephy_cfg = {
>   	.num_vregs		= 0,
>   	.regs			= pciephy_regs_layout,
>   
> -	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1517,7 +1515,6 @@ static const struct qmp_phy_cfg ipq8074_pciephy_gen3_cfg = {
>   	.num_vregs		= 0,
>   	.regs			= ipq_pciephy_gen3_regs_layout,
>   
> -	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   
> @@ -1547,7 +1544,6 @@ static const struct qmp_phy_cfg ipq6018_pciephy_cfg = {
>   	.num_vregs		= 0,
>   	.regs			= ipq_pciephy_gen3_regs_layout,
>   
> -	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1575,7 +1571,6 @@ static const struct qmp_phy_cfg sdm845_qmp_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sdm845_qmp_pciephy_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1601,7 +1596,6 @@ static const struct qmp_phy_cfg sdm845_qhp_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sdm845_qhp_pciephy_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1639,7 +1633,6 @@ static const struct qmp_phy_cfg sm8250_qmp_gen3x1_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1677,7 +1670,6 @@ static const struct qmp_phy_cfg sm8250_qmp_gen3x2_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1703,7 +1695,6 @@ static const struct qmp_phy_cfg msm8998_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= pciephy_regs_layout,
>   
> -	.start_ctrl             = SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   
> @@ -1733,7 +1724,6 @@ static const struct qmp_phy_cfg sc8180x_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1761,7 +1751,6 @@ static const struct qmp_phy_cfg sdx55_qmp_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl		= PCS_START | SERDES_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
>   	.phy_status		= PHYSTATUS_4_20,
>   };
> @@ -1789,7 +1778,6 @@ static const struct qmp_phy_cfg sm8450_qmp_gen3x1_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl             = SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS,
>   };
> @@ -1832,7 +1820,6 @@ static const struct qmp_phy_cfg sm8450_qmp_gen4x2_pciephy_cfg = {
>   	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
>   	.regs			= sm8250_pcie_regs_layout,
>   
> -	.start_ctrl             = SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
>   	.phy_status		= PHYSTATUS_4_20,
>   };
> @@ -1997,7 +1984,7 @@ static int qmp_pcie_power_on(struct phy *phy)
>   	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>   
>   	/* start SerDes and Phy-Coding-Sublayer */
> -	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
> +	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], SERDES_START | PCS_START);
>   
>   	if (!cfg->skip_start_delay)
>   		usleep_range(1000, 1200);
> @@ -2030,7 +2017,8 @@ static int qmp_pcie_power_off(struct phy *phy)
>   	qphy_setbits(qphy->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>   
>   	/* stop SerDes and Phy-Coding-Sublayer */
> -	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
> +	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_START_CTRL],
> +			SERDES_START | PCS_START);
>   
>   	/* Put PHY into POWER DOWN state: active low */
>   	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],

-- 
With best wishes
Dmitry