diff options
| author | Douglas Anderson <[email protected]> | 2022-12-09 09:12:37 -0800 |
|---|---|---|
| committer | Bjorn Andersson <[email protected]> | 2022-12-27 21:31:47 -0600 |
| commit | 9506a3661258d07a60b186f667b391708ddf63ac (patch) | |
| tree | fdfe1e333487ec1cdefd9e3ad492fbc6be00f84f /tools/perf/scripts/python/bin | |
| parent | 1c170714490e4d8c0886019145c9d90dfade14f9 (diff) | |
arm64: dts: qcom: sc7180: Bump up trogdor ts_reset_l drive strength
On at least one board (pazquel360) the reset line for the touchscreen
was scoped and found to take almost 2 ms to fall when we drove it
low. This wasn't great because the Linux driver for the touchscreen
(the elants_i2c driver) thinks it can do a 500 us reset pulse. If we
bump the drive strength to 8 mA then the reset line went down in ~421
us.
NOTE: we could apply this fix just for pazquel360, but:
* Probably other trogdor devices have similar timings and it's just
that nobody has noticed it before.
* There are other trogdor boards using the same elan driver that tries
to do 500 us reset pulses.
* Bumping the drive strength to 8mA across the board won't hurt. This
isn't a high speed signal or anything.
Signed-off-by: Douglas Anderson <[email protected]>
Reviewed-by: Matthias Kaehlcke <[email protected]>
Reviewed-by: Konrad Dybcio <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/20221209091234.v3.1.I39c387f1e3176fcf340039ec12d54047de9f8526@changeid
Diffstat (limited to 'tools/perf/scripts/python/bin')
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