drm/nouveau/i2c/aux/g94-: retry transactions after hw reports an error

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This fixes (works around?) link training failures seen on (at least)
the Lenovo P50's internal panel.

It's also an important fix on the same system for MST support on the
dock.  Sometimes, right after receiving an IRQ from the sink, there's
an error bit (SINKSTAT_ERR) set in the DPAUX registers before we've
even attempted a transaction.

v2. Fixed regression on passive DP->DVI adapters.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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This commit is contained in:

Ben Skeggs 2016-11-03 16:37:33 +10:00

parent 768e847759

commit f1963a47c0

2 changed files with 10 additions and 10 deletions

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10

drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c

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10

drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxgm200.c

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