diff options
| author | Jonathan Gray <jsg@cvs.openbsd.org> | 2021-07-26 06:24:23 +0000 |
|---|---|---|
| committer | Jonathan Gray <jsg@cvs.openbsd.org> | 2021-07-26 06:24:23 +0000 |
| commit | b819847213c9d85476919660e119b04b741abd14 (patch) | |
| tree | 8c799ed78c17e8c076404b5d6d00bb49e9469348 /sys/dev/pci/drm | |
| parent | c76192eba764eca120c08d3a49e9b0db51c1a29b (diff) | |
retry i2c transfers on -EAGAIN up to the number of times specified in
struct i2c_adapter
inteldrm gmbus returns -EAGAIN to fallback to gpio bitbanging
Diffstat (limited to 'sys/dev/pci/drm')
| -rw-r--r-- | sys/dev/pci/drm/drm_linux.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sys/dev/pci/drm/drm_linux.c b/sys/dev/pci/drm/drm_linux.c index 58ec65b597e..126c078b56e 100644 --- a/sys/dev/pci/drm/drm_linux.c +++ b/sys/dev/pci/drm/drm_linux.c @@ -1,4 +1,4 @@ -/* $OpenBSD: drm_linux.c,v 1.80 2021/07/07 02:38:21 jsg Exp $ */ +/* $OpenBSD: drm_linux.c,v 1.81 2021/07/26 06:24:22 jsg Exp $ */ /* * Copyright (c) 2013 Jonathan Gray <jsg@openbsd.org> * Copyright (c) 2015, 2016 Mark Kettenis <kettenis@openbsd.org> @@ -1037,15 +1037,21 @@ fail: int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { - int ret; + int ret, retries; if (adap->lock_ops) adap->lock_ops->lock_bus(adap, 0); + retries = adap->retries; +retry: if (adap->algo) ret = adap->algo->master_xfer(adap, msgs, num); else ret = i2c_master_xfer(adap, msgs, num); + if (ret == -EAGAIN && retries > 0) { + retries--; + goto retry; + } if (adap->lock_ops) adap->lock_ops->unlock_bus(adap, 0); |