NACK[F]/CMT: [PATCH 0/1][SRU][OEM-B-OSP1][F][OEM-5.6][G] Thunderbolt3 daisy chain sometimes doesn't work

[Kelsey Skunberg]

This breaks Focal/master-next and has been dropped.

Ian troubleshooted this for us and found the build fails due to not
finding 'tb_drom_read_n'. This has not been introduced to Focal yet.

upstream patch that adds 'tb_drom_read_n': b04079837b20 ("thunderbolt:
Add initial support for USB4")

For Focal, may you please include any additional backports, test, and
submit a v2? Thank you! 

-Kelsey

On 2020-09-15 11:32:19 , AceLan Kao wrote:
> BugLink: https://bugs.launchpad.net/bugs/1895606
> 
> [Impact]
> Plug-in thunderbolt external monitor, and then plug-in thunderbolt
> external Hard drive on the external monitor, it sometimes can't detect
> the TBT storage.
> 
> [Fix]
> Retry tb_drom_read_n() when failed fixes this issue.
> 
> [Test]
> Verified on Dell platform with ASUS PA27AC Thunderbolt 3, and HP P800 TBT
> storage.
> 
> [Regression Potential]
> Low, it only add 100ms delay and retry once.
> 
> Mika Westerberg (1):
>   thunderbolt: Retry DROM read once if parsing fails
> 
>  drivers/thunderbolt/eeprom.c | 20 ++++++++++++++++----
>  1 file changed, 16 insertions(+), 4 deletions(-)
> 
> -- 
> 2.25.1
> 
> 
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