linux-kernel - Re: [PATCH v2 00/14] PCI: brcmstb: enable PCIe for STB chips

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Date:   Fri, 29 May 2020 11:48:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     linux-pci@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list@...adcom.com,
        Alan Stern <stern@...land.harvard.edu>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Corey Minyard <minyard@....org>,
        Dan Williams <dan.j.williams@...el.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux-foundation.org>,
        Julien Grall <julien.grall@....com>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Oliver Neukum <oneukum@...e.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Saravana Kannan <saravanak@...gle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Wolfram Sang <wsa@...nel.org>
Subject: Re: [PATCH v2 00/14] PCI: brcmstb: enable PCIe for STB chips

On Tue, May 26, 2020 at 03:12:39PM -0400, Jim Quinlan wrote:
> v2:
> Commit: "device core: Add ability to handle multiple dma offsets"
>   o Added helper func attach_dma_pfn_offset_map() in address.c (Chistoph)
>   o Helpers funcs added to __phys_to_dma() & __dma_to_phys() (Christoph)
>   o Added warning when multiple offsets are needed and !DMA_PFN_OFFSET_MAP
>   o dev->dma_pfn_map => dev->dma_pfn_offset_map
>   o s/frm/from/ for dma_pfn_offset_frm_{phys,dma}_addr() (Christoph)
>   o In device.h: s/const void */const struct dma_pfn_offset_region */
>   o removed 'unlikely' from unlikely(dev->dma_pfn_offset_map) since
>     guarded by CONFIG_DMA_PFN_OFFSET_MAP (Christoph)
>   o Since dev->dma_pfn_offset is copied in usb/core/{usb,message}.c, now
>     dev->dma_pfn_offset_map is copied as well.
>   o Merged two of the DMA commits into one (Christoph).
> 
> Commit "arm: dma-mapping: Invoke dma offset func if needed":
>   o Use helper functions instead of #if CONFIG_DMA_PFN_OFFSET
> 
> Other commits' changes:
>   o Removed need for carrying of_id var in priv (Nicolas)
>   o Commit message rewordings (Bjorn)
>   o Commit log messages filled to 75 chars (Bjorn)
>   o devm_reset_control_get_shared())
>     => devm_reset_control_get_optional_shared (Philipp)
>   o Add call to reset_control_assert() in PCIe remove routines (Philipp)
> 
> v1:
> 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.

If you can enable the h/w support without the multiple offset support, 
then I'd split up this series. The latter part might take a bit more 
time.

Rob