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Ilya Katsnelson bb4d5006c0 ramips: fix PCI init on MT7620 with Linux 4.9+
So, this is kind of complicated. This has been upstream for a while,
imported from OpenWRT/LEDE with some cleanups. LEDE ramips has stayed
on linux-4.4 this whole time, with the old(er) version of the patch
that had correct behavior[0], while upstream got changed[1].

When LEDE updated to kernel 4.9, the older version of the code from
the patch got replaced with the upstream version containing the bug.

The original behavior, however, seems to be correct here, as the
official programming guide[2] indicates that bit 31 (PDRV_SW_SET)
in register PPLL_CFG1 is reserved, but bit 23 (added as PPLL_LD)
is the PPLL lock state (which also happens to line up with the
error message).

The original confusion probably comes from the double definition
of PDRV_SW_SET[3, 4] in the upstream code, with one correct definition
(31) and one incorrect one (23).

I've also used the opportunity to clean up the error message a bit -
it's still not really helpful to anyone who doesn't already know what
the PPLL is, but at least it's slightly more readable now.

This will probably need to be upstreamed as well, since with the way
it's currently set up, it's unlikely PCI ever worked for anyone who's
running an upstream kernel on that SoC.

[0]: 05d6e92594/target/linux/ramips/patches-4.4/0009-PCI-MIPS-adds-mt7620a-pcie-driver.patch (L259)
[1]: 026d15f6b9/arch/mips/pci/pci-mt7620.c (L246)
[2]: http://www.anz.ru/files/mediatek/MT7620_ProgrammingGuide.pdf
[3]: 026d15f6b9/arch/mips/pci/pci-mt7620.c (L36)
[4]: 026d15f6b9/arch/mips/pci/pci-mt7620.c (L39)

Signed-off-by: Ilya Katsnelson <me@0upti.me>
2017-07-31 21:28:37 +02:00
.github github: include pull request template 2017-03-12 17:38:31 +01:00
config build: enable gzipping of images on x86 even if ext4 is disabled 2017-07-06 11:30:33 +02:00
include kernel: update kernel 4.4 to version 4.4.79 2017-07-28 22:46:26 +02:00
package procd: update to latest git HEAD 2017-07-31 19:20:16 +02:00
scripts scripts/package-metadata.pl: inhibit compile deps on missing build types 2017-07-27 00:37:05 +02:00
target ramips: fix PCI init on MT7620 with Linux 4.9+ 2017-07-31 21:28:37 +02:00
toolchain toolchain/arc: update to the most recent release arc-2017.03 2017-07-18 23:23:27 +02:00
tools firmware-utils: mktplinkfw2: respect -e option when reading fw info 2017-07-31 11:43:42 +02:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore gitignore: add /overlay 2017-01-15 18:16:29 +01:00
BSDmakefile add missing copyright header 2007-02-26 01:05:09 +00:00
Config.in branding: add LEDE branding 2016-03-24 22:40:13 +01:00
LICENSE finally move buildroot-ng to trunk 2016-03-20 17:29:15 +01:00
Makefile build: prepare config.seed before package compilation 2017-03-18 12:08:04 +01:00
README README: Update project README 2016-05-12 03:29:36 +02:00
feeds.conf.default Add video feed to feeds.conf.default 2017-01-25 16:04:39 +01:00
rules.mk rules.mk: make PKG_CONFIG_DEPENDS properly track string values 2017-02-27 23:46:53 +01:00

README

This is the buildsystem for the LEDE Linux distribution.

Please use "make menuconfig" to choose your preferred
configuration for the toolchain and firmware.

You need to have installed gcc, binutils, bzip2, flex, python, perl, make,
find, grep, diff, unzip, gawk, getopt, subversion, libz-dev and libc headers.

Run "./scripts/feeds update -a" to get all the latest package definitions
defined in feeds.conf / feeds.conf.default respectively
and "./scripts/feeds install -a" to install symlinks of all of them into
package/feeds/.

Use "make menuconfig" to configure your image.

Simply running "make" will build your firmware.
It will download all sources, build the cross-compile toolchain, 
the kernel and all choosen applications.

To build your own firmware you need to have access to a Linux, BSD or MacOSX system
(case-sensitive filesystem required). Cygwin will not be supported because of
the lack of case sensitiveness in the file system.


Sunshine!
	Your LEDE Community
	http://www.lede-project.org