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Date: Thu, 29 Feb 2024 12:23:16 +0100
From: Niklas Cassel <cassel@kernel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>,
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Subject: Re: [PATCH v8 07/10] PCI: dwc: ep: Remove "core_init_notifier" flag
Message-ID: <ZeBpJL1K_vAdmr2M@fedora>
References: <20240224-pci-dbi-rework-v8-0-64c7fd0cfe64@linaro.org>
 <20240224-pci-dbi-rework-v8-7-64c7fd0cfe64@linaro.org>
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In-Reply-To: <20240224-pci-dbi-rework-v8-7-64c7fd0cfe64@linaro.org>

Hello Mani,

On Sat, Feb 24, 2024 at 12:24:13PM +0530, Manivannan Sadhasivam wrote:
> "core_init_notifier" flag is set by the glue drivers requiring refclk from
> the host to complete the DWC core initialization. Also, those drivers will
> send a notification to the EPF drivers once the initialization is fully
> completed using the pci_epc_init_notify() API. Only then, the EPF drivers
> will start functioning.
> 
> For the rest of the drivers generating refclk locally, EPF drivers will
> start functioning post binding with them. EPF drivers rely on the
> 'core_init_notifier' flag to differentiate between the drivers.
> Unfortunately, this creates two different flows for the EPF drivers.
> 
> So to avoid that, let's get rid of the "core_init_notifier" flag and follow
> a single initialization flow for the EPF drivers. This is done by calling
> the dw_pcie_ep_init_notify() from all glue drivers after the completion of
> dw_pcie_ep_init_registers() API. This will allow all the glue drivers to
> send the notification to the EPF drivers once the initialization is fully
> completed.
> 
> Only difference here is that, the drivers requiring refclk from host will
> send the notification once refclk is received, while others will send it
> during probe time itself.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> ---
>  drivers/pci/controller/dwc/pci-dra7xx.c           |  2 ++
>  drivers/pci/controller/dwc/pci-imx6.c             |  2 ++
>  drivers/pci/controller/dwc/pci-keystone.c         |  2 ++
>  drivers/pci/controller/dwc/pci-layerscape-ep.c    |  2 ++
>  drivers/pci/controller/dwc/pcie-designware-plat.c |  2 ++
>  drivers/pci/controller/dwc/pcie-qcom-ep.c         |  1 -
>  drivers/pci/controller/dwc/pcie-rcar-gen4.c       |  2 ++
>  drivers/pci/controller/dwc/pcie-tegra194.c        |  1 -
>  drivers/pci/controller/dwc/pcie-uniphier-ep.c     |  2 ++
>  drivers/pci/endpoint/functions/pci-epf-test.c     | 18 +++++-------------
>  include/linux/pci-epc.h                           |  3 ---

pcie-artpec6.c:static const struct dw_pcie_ep_ops pcie_ep_ops = {
pcie-keembay.c:static const struct dw_pcie_ep_ops keembay_pcie_ep_ops = {

Where is the love for these drivers? ;)


Kind regards,
Niklas