Subject: Re: [PATCH 00/15] PCI: brcmstb: enable PCIe for STB chips

From: Bjorn Helgaas <[email-masked]>
Date: Wed, 20 May 2020 11:15:41 -0500

On Tue, May 19, 2020 at 04:33:58PM -0400, Jim Quinlan wrote:
> This patchset expands the usefulness of the Broadcom Settop Box PCIe
> controller by building upon the PCIe driver used currently by the
> Raspbery Pi.  Other forms of this patchset were submitted by me years
> ago and not accepted; the major sticking point was the code required
> for the DMA remapping needed for the PCIe driver to work [1].
> 
> There have been many changes to the DMA and OF subsystems since that
> time, making a cleaner and less intrusive patchset possible.  This
> patchset implements a generalization of "dev->dma_pfn_offset", except
> that instead of a single scalar offset it provides for multiple
> offsets via a function which depends upon the "dma-ranges" property of
> the PCIe host controller.  This is required for proper functionality
> of the BrcmSTB PCIe controller and possibly some other devices.
> 
> [1] https://lore.kernel.org/linux-arm-kernel/[email-masked]/
> 
> Jim Quinlan (15):
>   PCI: brcmstb: PCIE_BRCMSTB depends on ARCH_BRCMSTB
>   ahci_brcm: fix use of BCM7216 reset controller
>   dt-bindings: PCI: Add bindings for more Brcmstb chips
>   PCI: brcmstb: Add compatibily of other chips
>   PCI: brcmstb: Add suspend and resume pm_ops
>   PCI: brcmstb: Asserting PERST is different for 7278
>   PCI: brcmstb: Add control of rescal reset
>   of: Include a dev param in of_dma_get_range()
>   device core: Add ability to handle multiple dma offsets
>   dma-direct: Invoke dma offset func if needed
>   arm: dma-mapping: Invoke dma offset func if needed
>   PCI: brcmstb: Set internal memory viewport sizes
>   PCI: brcmstb: Accommodate MSI for older chips
>   PCI: brcmstb: Set bus max burst side by chip type
>   PCI: brcmstb: add compatilbe chips to match list

If you have occasion to post a v2 for other reasons,

s/PCIE_BRCMSTB depends on ARCH_BRCMSTB/Allow PCIE_BRCMSTB on ARCH_BRCMSTB also/
s/ahci_brcm: fix use of BCM7216 reset controller/ata: ahci_brcm: Fix .../
s/Add compatibily of other chips/Add bcm7278 register info/
s/Asserting PERST is different for 7278/Add bcm7278 PERST support/
s/Set bus max burst side/Set bus max burst size/
s/add compatilbe chips.*/Add bcm7211, bcm7216, bcm7445, bcm7278 to match list/

Rewrap commit logs to use full 75 character lines (to allow for the 4
spaces added by git log).

In commit logs, s/This commit// (use imperative mood instead).

In "Accommodate MSI for older chips" commit log, s/commont/common/.

>  .../bindings/pci/brcm,stb-pcie.yaml           |  40 +-
>  arch/arm/include/asm/dma-mapping.h            |  17 +-
>  drivers/ata/ahci_brcm.c                       |  14 +-
>  drivers/of/address.c                          |  54 ++-
>  drivers/of/device.c                           |   2 +-
>  drivers/of/of_private.h                       |   8 +-
>  drivers/pci/controller/Kconfig                |   4 +-
>  drivers/pci/controller/pcie-brcmstb.c         | 403 +++++++++++++++---
>  include/linux/device.h                        |   9 +-
>  include/linux/dma-direct.h                    |  16 +
>  include/linux/dma-mapping.h                   |  44 ++
>  kernel/dma/Kconfig                            |  12 +
>  12 files changed, 542 insertions(+), 81 deletions(-)
> 
> -- 
> 2.17.1
> 

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