Hi Dmitry,
On 2018-03-07 20:34, Dmitry Torokhov wrote:
Hi Marek,
On Wed, Mar 07, 2018 at 12:56:04PM +0100, Marek Szyprowski wrote:
Executing stmfts_power_on() function lasts over 2 seconds, what
I suppose that is because of calibration that is done as part of
powering on?
Not only calibration. All executed commands takes significant amount of
time:
STMFTS_MS_CX_TUNING: 0.85s
STMFTS_SS_CX_TUNING: 0.70s
STMFTS_FULL_FORCE_CALIBRATION: 0.28s
significantly slows down the boot process if driver is compiled in.
Avoid this delay by forcing this driver to be probed asynchronously.
I do not have an objection for making the probe asynchronous, but don't
you have similar issue on resume?
Right, similar issue will be on driver resume and it won't be that easy
to make it asynchronous. Should I change that function to schedule an
asynchronous work?
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/input/touchscreen/stmfts.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
index 025bae3853cc..964f1f43f9ba 100644
--- a/drivers/input/touchscreen/stmfts.c
+++ b/drivers/input/touchscreen/stmfts.c
@@ -812,6 +812,7 @@ static struct i2c_driver stmfts_driver = {
.name = STMFTS_DEV_NAME,
.of_match_table = of_match_ptr(stmfts_of_match),
.pm = &stmfts_pm_ops,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = stmfts_probe,
.remove = stmfts_remove,
--
2.15.0
Thanks.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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