[PATCH v4 00/18] PCI: dwc: Various fixes and cleanups

Serge Semin
2022-06-10T08:29:22Z

This patchset is a first one in the series created in the framework of
my Baikal-T1 PCIe/eDMA-related work:

[1: In-progress v4] PCI: dwc: Various fixes and cleanups
Link: ---you are looking at it---
[2: In-progress v2] PCI: dwc: Add hw version and dma-ranges support
Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
[3: In-progress v2] PCI: dwc: Add extended YAML-schema and Baikal-T1 support
Link: https://lore.kernel.org/linux-pci/20220503214638.1895-1-Sergey.Semin@baikalelectronics.ru/
[4: In-progress v2] dmaengine: dw-edma: Add RP/EP local DMA support
Link: https://lore.kernel.org/linux-pci/20220503225104.12108-1-Sergey.Semin@baikalelectronics.ru/

Note it is very recommended to merge the patchsets in the same order as
they are placed in the list above in order to prevent possible merge
conflicts. Nothing prevents them from being reviewed synchronously though.
Any tests are very welcome!

As it can be easily inferred from the patchset title, this series is about
the DW PCIe Root Port/Endpoint driver fixes and the code cleanups, where
fixes come before the cleanup patches. The patchset starts with adding the
stop_link() platform-specific method invocation in case of the PCIe host
probe procedure errors. It has been missing in the cleanup-on-error path
of the DW PCIe Host initialization method. After that the unrolled CSRs
layout is added to the iATU disable procedure. In third the disable iATU
procedure is fixed to be called only for the internal ATU as being
specific for the internal ATU implementation. Then the outbound iATU
extended region setup procedure is fixed to have the INCREASE_REGION_SIZE
flag set based on the limit-address - not the region size one. The last
but not least the CDM-check enabling procedure is fixed to be independent
from the non-related num_lanes field state.

Afterwards there is a series of cleanups. It concerns the changes like
adding braces to the multi-line if-else constructions, trailing new-lines
to the print format-string, dropping unnecessary version checking, and
various code simplifications and optimizations.

New features like adding two-level DT bindings abstraction, adding better
structured IP-core version interface, adding iATU regions size detection
and the PCIe regions verification procedure, adding dma-ranges support,
introducing a set of generic platform clocks and resets and finally adding
Baikal-T1 PCIe interface support will be submitted in the next part of the
series.

Link: https://lore.kernel.org/linux-pci/20220324012524.16784-1-Sergey.Semin@baikalelectronics.ru/
Changelog v2:
- Fix the end address of the example in the patch log with
the INCREASE_REGION_SIZE flag usage fixup. It should be
0x1000FFFF and not 0x0000FFFF (@Manivannan).
- Add the cleanup-on-error path to the dw_pcie_ep_init() function.
(@Manivannan)

Link: https://lore.kernel.org/linux-pci/20220503212300.30105-1-Sergey.Semin@baikalelectronics.ru/
Changelog v3:
- Convert region variable type to u32 in order to fix the implicit type
conversion peculiarity. (@kbot)
- Rebase onto v5.18-rc6.

Link: https://lore.kernel.org/linux-pci/20220517125058.18488-1-Sergey.Semin@baikalelectronics.ru/
Changelog v4:
- Move the patch "PCI: dwc: Deallocate EPC memory on EP init error" to
being applied before the cleanup patches.
- Add a new fixes patch: "PCI: dwc: Enable CDM-check independently from
the num_lanes value".
- Add a new cleanup patch: "PCI: dwc: Organize local variables usage".
- Add a new cleanup patch: "PCI: dwc: Re-use local pointer to the
resource data".
- Add a new cleanup patch: "PCI: dwc: Add start_link/stop_link inliners".
- Add a new cleanup patch: "PCI: dwc: Move io_cfg_atu_shared to the Root
Port descriptor".
- Add a new cleanup patch: "PCI: dwc: Add dw_ prefix to the pcie_port
structure name".
- Drop the patch "PCI: dwc: Don't use generic IO-ops for DBI-space
access". (@Rob)
- Drop Manivannan tested tag from the changed patches.
- Rebase onto v5.18.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: "Krzysztof Wilczyński" <kw@linux.com>
Cc: Frank Li <Frank.Li@nxp.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Serge Semin (18):
PCI: dwc: Stop link in the host init error and de-initialization
PCI: dwc: Add unroll iATU space support to the regions disable method
PCI: dwc: Disable outbound windows for controllers with iATU
PCI: dwc: Set INCREASE_REGION_SIZE flag based on limit address
PCI: dwc: Deallocate EPC memory on EP init error
PCI: dwc: Enable CDM-check independently from the num_lanes value
PCI: dwc: Add braces to the multi-line if-else statements
PCI: dwc: Add trailing new-line literals to the log messages
PCI: dwc: Discard IP-core version checking on unrolled iATU detection
PCI: dwc: Convert Link-up status method to using dw_pcie_readl_dbi()
PCI: dwc: Organize local variables usage
PCI: dwc: Re-use local pointer to the resource data
PCI: dwc: Add start_link/stop_link inliners
PCI: dwc: Move io_cfg_atu_shared to the Root Port descriptor
PCI: dwc: Add dw_ prefix to the pcie_port structure name
PCI: dwc-plat: Simplify the probe method return value handling
PCI: dwc-plat: Discard unused regmap pointer
PCI: dwc-plat: Drop dw_plat_pcie_of_match forward declaration

drivers/pci/controller/dwc/pci-dra7xx.c | 12 +-
drivers/pci/controller/dwc/pci-exynos.c | 6 +-
drivers/pci/controller/dwc/pci-imx6.c | 6 +-
drivers/pci/controller/dwc/pci-keystone.c | 20 ++--
.../pci/controller/dwc/pci-layerscape-ep.c | 12 --
drivers/pci/controller/dwc/pci-layerscape.c | 2 +-
drivers/pci/controller/dwc/pci-meson.c | 2 +-
drivers/pci/controller/dwc/pcie-al.c | 6 +-
drivers/pci/controller/dwc/pcie-armada8k.c | 4 +-
drivers/pci/controller/dwc/pcie-artpec6.c | 4 +-
.../pci/controller/dwc/pcie-designware-ep.c | 30 +++--
.../pci/controller/dwc/pcie-designware-host.c | 104 ++++++++++--------
.../pci/controller/dwc/pcie-designware-plat.c | 25 +----
drivers/pci/controller/dwc/pcie-designware.c | 72 +++++++-----
drivers/pci/controller/dwc/pcie-designware.h | 46 +++++---
drivers/pci/controller/dwc/pcie-dw-rockchip.c | 4 +-
drivers/pci/controller/dwc/pcie-fu740.c | 2 +-
drivers/pci/controller/dwc/pcie-histb.c | 10 +-
drivers/pci/controller/dwc/pcie-intel-gw.c | 6 +-
drivers/pci/controller/dwc/pcie-keembay.c | 4 +-
drivers/pci/controller/dwc/pcie-kirin.c | 2 +-
drivers/pci/controller/dwc/pcie-qcom.c | 4 +-
drivers/pci/controller/dwc/pcie-spear13xx.c | 6 +-
drivers/pci/controller/dwc/pcie-tegra194.c | 22 ++--
drivers/pci/controller/dwc/pcie-uniphier.c | 10 +-
drivers/pci/controller/dwc/pcie-visconti.c | 6 +-
26 files changed, 225 insertions(+), 202 deletions(-)

--
2.35.1