mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-05 18:41:58 +09:00
4396c507a8
[ Upstream commit e42b855837 ]
According to PCI specifications bits [0:2] of Command Register, this should
be by default disabled on reset. So explicitly disable these bits at early
beginning of driver initialization.
Also remove code which unconditionally enables all 3 bits and let kernel
code (via pci_set_master() function) to handle bus mastering of PCI Bridge
via emulated PCI_COMMAND on emulated bridge.
Adjust existing functions mvebu_pcie_handle_iobase_change() and
mvebu_pcie_handle_membase_change() to handle PCI_IO_BASE and PCI_MEM_BASE
registers correctly even when bus mastering on emulated bridge is disabled.
Link: https://lore.kernel.org/r/20211125124605.25915-7-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.