linux-kernel - [PATCH v3 04/12] PCI: brcmstb: Use bridge reset if available

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Message-ID: <fc972506-7fde-4b79-ac51-4657409e462f@marvell.com>
Date: Wed, 17 Jul 2024 00:36:52 +0530
From: Amit Singh Tomar <amitsinght@...vell.com>
To: Jim Quinlan <james.quinlan@...adcom.com>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        Stanimir Varbanov <svarbanov@...e.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
        "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: [PATCH v3 04/12] PCI: brcmstb: Use bridge reset if available

On 7/17/2024 12:10 AM, Jim Quinlan wrote:
> On Sat, Jul 13, 2024 at 3:12 PM Amit Singh Tomar <amitsinght@...vell.com> wrote:
>>
>> On 7/11/2024 3:46 AM, Jim Quinlan wrote:
>>> The 7712 SOC has a bridge reset which can be described in the device tree.
>>> If it is present, use it. Otherwise, continue to use the legacy method to
>>> reset the bridge.
>>>
>>> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
>>> ---
>>>    drivers/pci/controller/pcie-brcmstb.c | 22 +++++++++++++++++-----
>>>    1 file changed, 17 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
>>> index c257434edc08..92816d8d215a 100644
>>> --- a/drivers/pci/controller/pcie-brcmstb.c
>>> +++ b/drivers/pci/controller/pcie-brcmstb.c
>>> @@ -265,6 +265,7 @@ struct brcm_pcie {
>>>        enum pcie_type          type;
>>>        struct reset_control    *rescal;
>>>        struct reset_control    *perst_reset;
>>> +     struct reset_control    *bridge;
>>>        int                     num_memc;
>>>        u64                     memc_size[PCIE_BRCM_MAX_MEMC];
>>>        u32                     hw_rev;
>>> @@ -732,12 +733,19 @@ static void __iomem *brcm7425_pcie_map_bus(struct pci_bus *bus,
>>>
>>>    static void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
>>>    {
>>> -     u32 tmp, mask =  RGR1_SW_INIT_1_INIT_GENERIC_MASK;
>>> -     u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
>>> +     if (pcie->bridge) {
>>> +             if (val)
>>> +                     reset_control_assert(pcie->bridge);
>>> +             else
>>> +                     reset_control_deassert(pcie->bridge);
>>> +     } else {
>>> +             u32 tmp, mask =  RGR1_SW_INIT_1_INIT_GENERIC_MASK;
>>> +             u32 shift = RGR1_SW_INIT_1_INIT_GENERIC_SHIFT;
>>>
>>> -     tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
>>> -     tmp = (tmp & ~mask) | ((val << shift) & mask);
>>> -     writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
>>> +             tmp = readl(pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
>>> +             tmp = (tmp & ~mask) | ((val << shift) & mask);
>>> +             writel(tmp, pcie->base + PCIE_RGR1_SW_INIT_1(pcie));
>>> +     }
>>>    }
>>>
>>>    static void brcm_pcie_bridge_sw_init_set_7278(struct brcm_pcie *pcie, u32 val)
>>> @@ -1621,6 +1629,10 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>>>        if (IS_ERR(pcie->perst_reset))
>>>                return PTR_ERR(pcie->perst_reset);
>>>
>>> +     pcie->bridge = devm_reset_control_get_optional_exclusive(&pdev->dev, "bridge");
>>> +     if (IS_ERR(pcie->bridge))
>>> +             return PTR_ERR(pcie->bridge);
>> How about using "dev_err_probe," which utilizes "dev_err" for logging
>> error messages and recording the deferred probe reason?
> 
> Hello Amit,
> 
> Someone else brought this up and I want to defer moving to
> dev_err_probe() in a future series.  I'd like to get this series out
> now as Stan is waiting to apply his commits on top of it.
> 

Sure, that's fine with me.

Thanks,
-Amit