diff options
| author | Arnout Vandecappelle (Essensium/Mind) <[email protected]> | 2014-08-22 17:30:56 +0200 |
|---|---|---|
| committer | Lee Jones <[email protected]> | 2014-09-26 08:15:48 +0100 |
| commit | be1c770028b832945680ebf5c0d49b831ba719d5 (patch) | |
| tree | ce5b123bff0c5b6d8f1f5541045c9225ddcba697 /include/linux/fpga/fpga-mgr.h | |
| parent | dfa52c852dd3fcf3c0e696ab2d7df0bf91b2aed9 (diff) | |
mfd: tps65910: Work around silicon erratum SWCZ010
http://www.ti.com/lit/pdf/SWCZ010:
Glitch on SDA-SCL not managed correctly by the I2C IP
Impact:
The standard specifies that the I2C transfer should restart on a start
event in all cases. The current design does not support two consecutive
Start conditions. This can cause the first real access after such a
glitch to be corrupted.
Description:
An unexpected glitch on SDA and SCL can generate a wrong start event.
In the current design, the SCL line must toggle two times to detect a
new start event and completely restart the I2C access; hence the real
start event is not detected in the case of a single SCL toggle.
Workaround:
Repeat I2C access.
A simpler workaround is to make a dummy transfer just before the first
access to the tps65910 chip. This can be done unconditionally.
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions