Bug 203469

Summary:	SPI SCK is high while idle on Allwinner H3
Product:	Drivers	Reporter:	David Sawatzke (d-lbugzilla)
Component:	Other	Assignee:	drivers_other
Status:	NEW ---
Severity:	normal
Priority:	P1
Hardware:	ARM
OS:	Linux
Kernel Version:	4.19.25-sunxi (armbian)	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Pulseview session showing the issue when using software CE

Description David Sawatzke 2019-05-01 15:15:04 UTC

Created attachment 282567 [details]
Pulseview session showing the issue when using software CE

Regardless of spi settings, the sck line is high while not in a transaction. Before starting one, it goes low, but it still interferes in combination with a software ce pin, leading to corrupt data.

This seems to be a known issue to the broader community, but I couldn't find an existing bug report on the lkml or on bugzilla.

See here for further infos and potential fix: http://linux-sunxi.org/SPIdev#Bugs.2FCaveats

(Issue occured on orange pi one)