[PATCH v3 0/5] PCI: mt7621: Remove specific MIPS code from driver

From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
To: linux-pci@vger.kernel.org
Cc: tsbogend@alpha.franken.de, lorenzo.pieralisi@arm.com,
	bhelgaas@google.com, linux@roeck-us.net,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3 0/5] PCI: mt7621: Remove specific MIPS code from driver
Date: Tue,  7 Dec 2021 11:49:19 +0100	[thread overview]
Message-ID: <20211207104924.21327-1-sergio.paracuellos@gmail.com> (raw)

Hi all,

MIPS specific code can be removed from driver and put into ralink mt7621
instead which is a more accurate place to do this. To make this possible
we need to have access to 'bridge->windows' in 'pcibios_root_bridge_prepare()'
which has been implemented for ralink mt7621 platform (there is no real
need to implement this for any other platforms since those ones haven't got
I/O coherency units). This also allow us to properly enable this driver to
completely be enabled for COMPILE_TEST. This patchset appoarch:
- Move windows list splice in 'pci_register_host_bridge()' after function
  'pcibios_root_bridge_prepare()' is called.
- Implement 'pcibios_root_bridge_prepare()' for ralink mt7621.
- Avoid custom MIPs code in pcie-mt7621 driver.
- Add missing 'MODULE_LICENSE()' to pcie-mt7621 driver to avoid compile test
  module compilation to complain (already sent patch from Yanteng Si that
  I have rewrite commit message and long description a bit.
- Remove MIPS conditional code from Kconfig and mark driver as 'tristate'.

This patchset is a real fix for some errors reported by Kernel Test Robot about
implicit mips functions used in driver code and fix errors in driver when
is compiled as a module [1] (mips:allmodconfig).

Changes in v3:
 - Rebase the series on the top of the temporal fix sent for v5.16[3] for
   the module compilation problem.
 - Address review comments from Guenter in PATCH 2 (thanks Guenter!):
    - Address TODO in comment about the hardware does not allow zeros
      after 1s for the mask and WARN_ON if that's happend.
    - Be sure mask is real valid upper 16 bits.

Changes in v2:
 - Collect Acked-by from Arnd Bergmann for PATCH 1.
 - Collect Reviewed-by from Krzysztof Wilczyński for PATCH 4.
 - Adjust some patches commit subject and message as pointed out by Bjorn in review of v1 of the series[2]. 

This patchset is the good way of properly compile driver as a module removing
all MIPS specific code into arch ralink mt7621 place. To avoid mips:allmodconfig reported
problems for v5.16 the following patch has been sent[3]. This series are rebased onto this patch to provide
a real fix for this problem.

[0]: https://lore.kernel.org/linux-mips/CAMhs-H8ShoaYiFOOzJaGC68nZz=V365RXN_Kjuj=fPFENGJiiw@mail.gmail.com/T/#t
[1]: https://lkml.org/lkml/2021/11/14/436
[2]: https://lore.kernel.org/r/20211115070809.15529-1-sergio.paracuellos@gmail.com
[3]: https://lore.kernel.org/linux-pci/20211203192454.32624-1-sergio.paracuellos@gmail.com/T/#u

Thanks in advance for your time.

Best regards,
   Sergio Paracuellos

Sergio Paracuellos (5):
  PCI: Let pcibios_root_bridge_prepare() access to 'bridge->windows'
  MIPS: ralink: implement 'pcibios_root_bridge_prepare()'
  PCI: mt7621: Avoid custom MIPS code in driver code
  PCI: mt7621: Add missing 'MODULE_LICENSE()' definition
  PCI: mt7621: Allow COMPILE_TEST for all arches

 arch/mips/ralink/mt7621.c            | 31 ++++++++++++++++++++++
 drivers/pci/controller/Kconfig       |  4 +--
 drivers/pci/controller/pcie-mt7621.c | 39 ++--------------------------
 drivers/pci/probe.c                  |  4 +--
 4 files changed, 37 insertions(+), 41 deletions(-)

-- 
2.33.0