linux-kernel - Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of deassert/assert

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Message-ID: <20210329160607.GA9677@lpieralisi>
Date:   Mon, 29 Mar 2021 17:06:07 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jim Quinlan <jquinlan@...adcom.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/2] PCI: brcmstb: Use reset/rearm instead of
 deassert/assert

On Fri, Mar 12, 2021 at 03:45:55PM -0500, Jim Quinlan wrote:
> The Broadcom STB PCIe RC uses a reset control "rescal" for certain chips.
> The "rescal" implements a "pulse reset" so using assert/deassert is wrong
> for this device.  Instead, we use reset/rearm.  We need to use rearm so
> that we can reset it after a suspend/resume cycle; w/o using "rearm", the
> "rescal" device will only ever fire once.
> 
> Of course for suspend/resume to work we also need to put the reset/rearm
> calls in the suspend and resume routines.
> 
> Fixes: 740d6c3708a9 ("PCI: brcmstb: Add control of rescal reset")
> Signed-off-by: Jim Quinlan <jim2101024@...il.com>
> Acked-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)

Should I take this patch in the PCI queue ?

Thanks,
Lorenzo

> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index e330e6811f0b..3b35d629035e 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -1148,6 +1148,7 @@ static int brcm_pcie_suspend(struct device *dev)
>  
>  	brcm_pcie_turn_off(pcie);
>  	ret = brcm_phy_stop(pcie);
> +	reset_control_rearm(pcie->rescal);
>  	clk_disable_unprepare(pcie->clk);
>  
>  	return ret;
> @@ -1163,9 +1164,13 @@ static int brcm_pcie_resume(struct device *dev)
>  	base = pcie->base;
>  	clk_prepare_enable(pcie->clk);
>  
> +	ret = reset_control_reset(pcie->rescal);
> +	if (ret)
> +		goto err_disable_clk;
> +
>  	ret = brcm_phy_start(pcie);
>  	if (ret)
> -		goto err;
> +		goto err_reset;
>  
>  	/* Take bridge out of reset so we can access the SERDES reg */
>  	pcie->bridge_sw_init_set(pcie, 0);
> @@ -1180,14 +1185,16 @@ static int brcm_pcie_resume(struct device *dev)
>  
>  	ret = brcm_pcie_setup(pcie);
>  	if (ret)
> -		goto err;
> +		goto err_reset;
>  
>  	if (pcie->msi)
>  		brcm_msi_set_regs(pcie->msi);
>  
>  	return 0;
>  
> -err:
> +err_reset:
> +	reset_control_rearm(pcie->rescal);
> +err_disable_clk:
>  	clk_disable_unprepare(pcie->clk);
>  	return ret;
>  }
> @@ -1197,7 +1204,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
>  	brcm_msi_remove(pcie);
>  	brcm_pcie_turn_off(pcie);
>  	brcm_phy_stop(pcie);
> -	reset_control_assert(pcie->rescal);
> +	reset_control_rearm(pcie->rescal);
>  	clk_disable_unprepare(pcie->clk);
>  }
>  
> @@ -1278,13 +1285,13 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(pcie->perst_reset);
>  	}
>  
> -	ret = reset_control_deassert(pcie->rescal);
> +	ret = reset_control_reset(pcie->rescal);
>  	if (ret)
>  		dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
>  
>  	ret = brcm_phy_start(pcie);
>  	if (ret) {
> -		reset_control_assert(pcie->rescal);
> +		reset_control_rearm(pcie->rescal);
>  		clk_disable_unprepare(pcie->clk);
>  		return ret;
>  	}
> -- 
> 2.17.1
>