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
2017-07-31 19:20:16 +02:00
2017-01-15 18:16:29 +01:00
2007-02-26 01:05:09 +00:00
2016-03-24 22:40:13 +01:00
2016-03-20 17:29:15 +01:00
2016-05-12 03:29:36 +02:00

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.


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