diff options
| author | Franklin S Cooper Jr <fcooper@ti.com> | 2015-10-07 04:52:25 -0500 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2015-10-08 11:00:46 +0530 |
| commit | bf37323c855daa113860a53f05da27059204442e (patch) | |
| tree | e2a9b5c906738366b65b6e99694c05dae3b65e85 | |
| parent | 75c1c42d45131c3b998779cccc94edfc2c020193 (diff) | |
| download | jacinto6evm-bf37323c855daa113860a53f05da27059204442e.tar.gz | |
Input: edt-ft5x06 - Work around FT5506 firmware bug
In the touchscreen controller ISR, reading the tsc starting from
register 0x2 causes the tsc to very infrequently update the detected
finger movement coordinates. The irq pin toogles at a fast rate to
indicate touch events are happening but when reading the coordinates
from the tsc the are only updated/change at at rate of ~100 ms.
Example:
X: 10 , Y: 30
X: 10 , Y: 30
X: 10, Y: 30
..
// After 100 ms
X: 300, Y: 300
X: 300, y: 300
..
// After 100 ms
X: 1743, Y: 621
X: 1743, Y: 621
For some reason if instead of starting to read at register 0x2 you
start reading at register 0x0 this issue isn't seen. This seems like
a quirk only seen in the EDT FT5506 so to fix this issue simply
adjust the code to start reading from 0x0. Since there is technically
nothing wrong with doing this no regressions should be seen with other
touchscreen controllers supported by this driver.
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
| -rw-r--r-- | drivers/input/touchscreen/edt-ft5x06.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index 2a2075c5e6b2..8db73b9997a9 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -174,7 +174,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) struct edt_ft5x06_ts_data *tsdata = dev_id; struct device *dev = &tsdata->client->dev; u8 cmd; - u8 rdbuf[59]; + u8 rdbuf[61]; int i, type, x, y, id; int offset, tplen, datalen; int error; @@ -190,8 +190,8 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) break; case M09: - cmd = 0x02; - offset = 1; + cmd = 0x0; + offset = 3; tplen = 6; datalen = tplen * tsdata->max_support_points + 1 - cmd; break; |