[PATCH 0/5] staging: mt7621-pci: re-do reset boot process

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Some time ago Greg Ungerer reported some random hangs using
the staging mt7621-pci driver:

See:
* http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2019-June/134947.html 

Try to fix that is the main motivation of this patch series.

Also in openwrt there is a driver for mt7621-pci which seems was rewritten
from scratch (for kernel 4.14) by Ryder Lee and Weijie Gao from mediatek. 
There the approach for reset assert-deassert process is to set as 'gpio'
the function for all the 'pcie' group for the pinctrl driver and use those
gpio's as a reset for the end points. The driver I am talking about is still
using legacy pci and legacy gpio kernel interfaces. IMHO, the correct thing
to do is make this staging driver properly clean and functional and put it
in its correct place in the mainline.

See:
* https://gist.github.com/dengqf6/7a9e9b4032d99f1a91dd9256c8a65c36

Because of all of this this patch series tries to avoid random hangs of boot
trying to use the 'reset-gpios' approach.

Changes are only compile tested.

Hope this helps.

Best regards,
    Sergio Paracuellos

Sergio Paracuellos (5):
  staging: mt7621-pci: use gpios for properly reset
  staging: mt7621-pci: change value for 'PERST_DELAY_US'
  staging: mt7621-pci: remove not used definitions
  staging: mt7621-dts: make use of 'reset-gpios' property for pci
  staging: mt7621-pci: bindings: update doc accordly to last changes

 drivers/staging/mt7621-dts/mt7621.dtsi        | 11 ++-
 .../mt7621-pci/mediatek,mt7621-pci.txt        |  7 +-
 drivers/staging/mt7621-pci/pci-mt7621.c       | 86 +++++++++++--------
 3 files changed, 62 insertions(+), 42 deletions(-)

-- 
2.25.1

_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel



[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux