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Date: Mon, 4 Mar 2024 11:56:25 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Niklas Cassel <cassel@kernel.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: <20240304062625.GG2647@thinkpad>
References: <20240224-pci-dbi-rework-v8-0-64c7fd0cfe64@linaro.org>
 <20240224-pci-dbi-rework-v8-7-64c7fd0cfe64@linaro.org>
 <ZeBpJL1K_vAdmr2M@fedora>
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In-Reply-To: <ZeBpJL1K_vAdmr2M@fedora>

On Thu, Feb 29, 2024 at 12:23:16PM +0100, Niklas Cassel wrote:
> 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? ;)
> 

Ah, my grep skills got exposed :(

Will fix them.

- Mani

-- 
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