diff options
| author | Sebastian Reichel <sebastian.reichel@collabora.co.uk> | 2018-05-24 09:33:36 -0700 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-12-13 12:43:57 +0100 |
| commit | 5b755634298ffaf988b5f90e999e2e970b19c6b4 (patch) | |
| tree | 630a18367bb1dd1096d5c35eb8fea782b9c9a03f /drivers | |
| parent | 7642222554225c33dab5b5090eaca39110627eaf (diff) | |
Input: atmel_mxt_ts - fix reset-gpio for level based irqs
The current reset-gpio support triggers an interrupt storm on platforms
using the maxtouch with level based interrupt. The Motorola Droid 4,
which I used for some of the tests is not affected, since it uses a edge
based interrupt.
This change avoids the interrupt storm by enabling the device while its
interrupt is disabled. Afterwards we wait 100ms. This is important for
two reasons: The device is unresponsive for some time (~22ms for
mxt224E) and the CHG (interrupt) line is not working properly for 100ms.
We don't need to wait for any following interrupts, since the following
mxt_initialize() checks for bootloader mode anyways.
This fixes a boot issue on GE PPD (watchdog kills device due to
interrupt storm) and does not cause regression on Motorola Droid 4.
Fixes: f657b00df22e ("Input: atmel_mxt_ts - add support for reset line")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
(cherry picked from commit ca1cd36cef00260db6b35b32d863e0c580c0488d)
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index dbefbafb8ac8..cb99b192769b 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -193,6 +193,8 @@ enum t100_type { /* Delay times */ #define MXT_BACKUP_TIME 50 /* msec */ +#define MXT_RESET_GPIO_TIME 20 /* msec */ +#define MXT_RESET_INVALID_CHG 100 /* msec */ #define MXT_RESET_TIME 200 /* msec */ #define MXT_RESET_TIMEOUT 3000 /* msec */ #define MXT_CRC_TIMEOUT 1000 /* msec */ @@ -1197,7 +1199,7 @@ static int mxt_soft_reset(struct mxt_data *data) return ret; /* Ignore CHG line for 100ms after reset */ - msleep(100); + msleep(MXT_RESET_INVALID_CHG); mxt_acquire_irq(data); @@ -3162,20 +3164,14 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return error; } + disable_irq(client->irq); + if (data->reset_gpio) { - data->in_bootloader = true; - msleep(MXT_RESET_TIME); - reinit_completion(&data->bl_completion); + msleep(MXT_RESET_GPIO_TIME); gpiod_set_value(data->reset_gpio, 1); - error = mxt_wait_for_completion(data, &data->bl_completion, - MXT_RESET_TIMEOUT); - if (error) - return error; - data->in_bootloader = false; + msleep(MXT_RESET_INVALID_CHG); } - disable_irq(client->irq); - error = mxt_initialize(data); if (error) return error; |