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Message-ID: <9e3b0b10-7605-4203-a4c0-351b51b2e63b@suse.de>
Date: Tue, 13 Aug 2024 19:45:49 +0300
From: Stanimir Varbanov <svarbanov@...e.de>
To: Jim Quinlan <james.quinlan@...adcom.com>, 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>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com
Cc: 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: Re: [PATCH v5 03/12] PCI: brcmstb: Use common error handling code in
brcm_pcie_probe()
Hi Jim,
On 8/1/24 01:28, Jim Quinlan wrote:
> o Move the clk_prepare_enable() below the resource allocations.
> o Move the clk_prepare_enable() out of __brcm_pcie_remove() but
> add it to the end of brcm_pcie_remove().
> o Add a jump target (clk_disable_unprepare) so that a bit of exception
> handling can be better reused at the end of this function implementation.
> o Use dev_err_probe() where it makes sense.
Those dev_err_probe produce these errors on RPi5:
rpi5:~ # dmesg -l err
[ 1.004960] brcm-pcie 1000110000.pcie: error 0000000000000000: could
not assert reset 'swinit'
[ 1.013812] brcm-pcie 1000110000.pcie: error 0000000000000000: could
not de-assert reset 'swinit' after asserting
[ 1.024222] brcm-pcie 1000110000.pcie: error 0000000000000000: failed
to deassert 'rescal'
[ 1.533839] brcm-pcie 1000110000.pcie: link down
[ 1.627564] brcm-pcie 1000120000.pcie: error 0000000000000000: could
not assert reset 'swinit'
[ 1.636415] brcm-pcie 1000120000.pcie: error 0000000000000000: could
not de-assert reset 'swinit' after asserting
[ 1.646829] brcm-pcie 1000120000.pcie: error 0000000000000000: failed
to deassert 'rescal'
... as you can see there is no error at all.
~Stan
>
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> ---
> drivers/pci/controller/pcie-brcmstb.c | 34 ++++++++++++---------------
> 1 file changed, 15 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index c08683febdd4..7595e7009192 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -1473,7 +1473,6 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie)
> dev_err(pcie->dev, "Could not stop phy\n");
> if (reset_control_rearm(pcie->rescal))
> dev_err(pcie->dev, "Could not rearm rescal reset\n");
> - clk_disable_unprepare(pcie->clk);
> }
>
> static void brcm_pcie_remove(struct platform_device *pdev)
> @@ -1484,6 +1483,7 @@ static void brcm_pcie_remove(struct platform_device *pdev)
> pci_stop_root_bus(bridge->bus);
> pci_remove_root_bus(bridge->bus);
> __brcm_pcie_remove(pcie);
> + clk_disable_unprepare(pcie->clk);
> }
>
> static const int pcie_offsets[] = {
> @@ -1613,31 +1613,26 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>
> pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
>
> - ret = clk_prepare_enable(pcie->clk);
> - if (ret) {
> - dev_err(&pdev->dev, "could not enable clock\n");
> - return ret;
> - }
> pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
> - if (IS_ERR(pcie->rescal)) {
> - clk_disable_unprepare(pcie->clk);
> + if (IS_ERR(pcie->rescal))
> return PTR_ERR(pcie->rescal);
> - }
> +
> pcie->perst_reset = devm_reset_control_get_optional_exclusive(&pdev->dev, "perst");
> - if (IS_ERR(pcie->perst_reset)) {
> - clk_disable_unprepare(pcie->clk);
> + if (IS_ERR(pcie->perst_reset))
> return PTR_ERR(pcie->perst_reset);
> - }
>
> - ret = reset_control_reset(pcie->rescal);
> + ret = clk_prepare_enable(pcie->clk);
> if (ret)
> - dev_err(&pdev->dev, "failed to deassert 'rescal'\n");
> + return dev_err_probe(&pdev->dev, ret, "could not enable clock\n");
> +
> + ret = reset_control_reset(pcie->rescal);
> + if (dev_err_probe(&pdev->dev, ret, "failed to deassert 'rescal'\n"))
> + goto clk_disable_unprepare;
>
> ret = brcm_phy_start(pcie);
> if (ret) {
> reset_control_rearm(pcie->rescal);
> - clk_disable_unprepare(pcie->clk);
> - return ret;
> + goto clk_disable_unprepare;
> }
>
> ret = brcm_pcie_setup(pcie);
> @@ -1654,10 +1649,8 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
> if (pci_msi_enabled() && msi_np == pcie->np) {
> ret = brcm_pcie_enable_msi(pcie);
> - if (ret) {
> - dev_err(pcie->dev, "probe of internal MSI failed");
> + if (dev_err_probe(pcie->dev, ret, "probe of internal MSI failed"))
> goto fail;
> - }
> }
>
> bridge->ops = pcie->type == BCM7425 ? &brcm7425_pcie_ops : &brcm_pcie_ops;
> @@ -1678,6 +1671,9 @@ static int brcm_pcie_probe(struct platform_device *pdev)
>
> fail:
> __brcm_pcie_remove(pcie);
> +clk_disable_unprepare:
> + clk_disable_unprepare(pcie->clk);
> +
> return ret;
> }
>
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