linux-kernel - Re: [PATCH v7 0/3] Add Qualcomm PCIe Endpoint driver support

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Date:   Tue, 3 Aug 2021 10:57:00 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <hemantk@...eaurora.org>, <smohanad@...eaurora.org>,
        <bjorn.andersson@...aro.org>, <sallenki@...eaurora.org>,
        <skananth@...eaurora.org>, <vpernami@...eaurora.org>,
        <vbadigan@...eaurora.org>
Subject: Re: [PATCH v7 0/3] Add Qualcomm PCIe Endpoint driver support

Hi Manivannan,

On 22/07/21 5:42 pm, Manivannan Sadhasivam wrote:
> Hello,
> 
> This series adds support for Qualcomm PCIe Endpoint controller found
> in platforms like SDX55. The Endpoint controller is based on the designware
> core with additional Qualcomm wrappers around the core.
> 
> The driver is added separately unlike other Designware based drivers that
> combine RC and EP in a single driver. This is done to avoid complexity and
> to maintain this driver autonomously.
> 
> The driver has been validated with an out of tree MHI function driver on
> SDX55 based Telit FN980 EVB connected to x86 host machine over PCIe.

Can you also validate it with in-kernel pci-endpoint-test?

It would also help if you can test your patches after
https://lore.kernel.org/r/20210803050310.27122-1-kishon@ti.com

Not expecting any dependencies but just to cross check.

Thanks
Kishon

> 
> Thanks,
> Mani
> 
> Changes in v7:
> 
> * Used existing naming convention for callback functions
> * Used active low state for PERST# gpio
> 
> Changes in v6:
> 
> * Removed status property in DT and added reviewed tag from Rob
> * Switched to _relaxed variants as suggested by Rob
> 
> Changes in v5:
> 
> * Removed the DBI register settings that are not needed
> * Used the standard definitions available in pci_regs.h
> * Added defines for all the register fields
> * Removed the left over code from previous iteration
> 
> Changes in v4:
> 
> * Removed the active_config settings needed for IPA integration
> * Switched to writel for couple of relaxed versions that sneaked in
> 
> Changes in v3:
> 
> * Lot of minor cleanups to the driver patch based on review from Bjorn and Stan.
> * Noticeable changes are:
>   - Got rid of _relaxed calls and used readl/writel
>   - Got rid of separate TCSR memory region and used syscon for getting the
>     register offsets for Perst registers
>   - Changed the wake gpio handling logic
>   - Added remove() callback and removed "suppress_bind_attrs"
>   - stop_link() callback now just disables PERST IRQ
> * Added MMIO region and doorbell interrupt to the binding
> * Added logic to write MMIO physicall address to MHI base address as it is
>   for the function driver to work
> 
> Changes in v2:
> 
> * Addressed the comments from Rob on bindings patch
> * Modified the driver as per binding change
> * Fixed the warnings reported by Kbuild bot
> * Removed the PERST# "enable_irq" call from probe()
> 
> Manivannan Sadhasivam (3):
>   dt-bindings: pci: Add devicetree binding for Qualcomm PCIe EP
>     controller
>   PCI: qcom-ep: Add Qualcomm PCIe Endpoint controller driver
>   MAINTAINERS: Add entry for Qualcomm PCIe Endpoint driver and binding
> 
>  .../devicetree/bindings/pci/qcom,pcie-ep.yaml | 158 ++++
>  MAINTAINERS                                   |  10 +-
>  drivers/pci/controller/dwc/Kconfig            |  10 +
>  drivers/pci/controller/dwc/Makefile           |   1 +
>  drivers/pci/controller/dwc/pcie-qcom-ep.c     | 710 ++++++++++++++++++
>  5 files changed, 888 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
>  create mode 100644 drivers/pci/controller/dwc/pcie-qcom-ep.c
>