linux-kernel - Re: [PATCH] PCI: dw-rockchip: Skip waiting for link up

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Message-ID: <5EFEAC8C-6BAA-46BC-9EED-F0D89952D3E5@kernel.org>
Date: Mon, 13 Jan 2025 22:14:21 +0100
From: Niklas Cassel <cassel@...nel.org>
To: Bjorn Helgaas <helgaas@...nel.org>
CC: Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Heiko Stuebner <heiko@...ech.de>, Damien Le Moal <dlemoal@...nel.org>,
 Anand Moon <linux.amoon@...il.com>, linux-pci@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org,
 Krishna chaitanya chundru <quic_krichai@...cinc.com>
Subject: Re: [PATCH] PCI: dw-rockchip: Skip waiting for link up



On 13 January 2025 20:27:20 CET, Bjorn Helgaas <helgaas@...nel.org> wrote:
>On Mon, Jan 13, 2025 at 11:59:34AM +0100, Niklas Cassel wrote:
>> The Root Complex specific device tree binding for pcie-dw-rockchip has the
>> 'sys' interrupt marked as required.
>> 
>> The driver requests the 'sys' IRQ unconditionally, and errors out if not
>> provided.
>> 
>> Thus, we can unconditionally set use_linkup_irq before calling
>> dw_pcie_host_init().
>> 
>> This will skip the wait for link up (since the bus will be enumerated once
>> the link up IRQ is triggered), which reduces the bootup time.
>> 
>> Signed-off-by: Niklas Cassel <cassel@...nel.org>
>
>Thanks!  I was just reviewing the addition of your dll_link_up IRQ
>handler, and was about to ask whether you wanted to set use_linkup_irq
>to avoid the wait, but here's the patch already :)

:)

>
>I think I'll sort out the branches so the dll_link_up IRQ handler,
>this patch, and the corresponding qcom change go on the same branch as
>Krishna's patch to skip waiting if pp->use_linkup_irq.

That sounds like a good idea.

Thank you!


Kind regards,
Niklas

>
>> ---
>>  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
>> index 1170e1107508bd793b610949b0afe98516c177a4..62034affb95fbb965aad3cebc613a83e31c90aee 100644
>> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
>> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
>> @@ -435,6 +435,7 @@ static int rockchip_pcie_configure_rc(struct rockchip_pcie *rockchip)
>>  
>>  	pp = &rockchip->pci.pp;
>>  	pp->ops = &rockchip_pcie_host_ops;
>> +	pp->use_linkup_irq = true;
>>  
>>  	return dw_pcie_host_init(pp);
>>  }
>> 
>> ---
>> base-commit: 2adda4102931b152f35d054055497631ed97fe73
>> change-id: 20250113-rockchip-no-wait-403ffbc42313
>> 
>> Best regards,
>> -- 
>> Niklas Cassel <cassel@...nel.org>
>>