Bug 203469 - SPI SCK is high while idle on Allwinner H3
Summary: SPI SCK is high while idle on Allwinner H3
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Other (show other bugs)
Hardware: ARM Linux
: P1 normal
Assignee: drivers_other
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-05-01 15:15 UTC by David Sawatzke
Modified: 2019-05-01 15:15 UTC (History)
0 users

See Also:
Kernel Version: 4.19.25-sunxi (armbian)
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Pulseview session showing the issue when using software CE (34.15 KB, application/vnd.sigrok.session)
2019-05-01 15:15 UTC, David Sawatzke 		Details
Add an attachment (proposed patch, testcase, etc.)

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)
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