In imx_keypad_inhibit(), all 8 columns were set to open-drain, in contrast to the rest of the driver, where only the enabled columns are modified/used. Contrary to the normal expectation, this also affects column I/Os not even mapped via IOMUX to the KPP hardware module but used as a GPIO. Therefore only init enabled columns to open-drain and leave all others with their default reset value of 0, i.e. totem-pole. Signed-off-by: Andreas Pretzsch <apr@xxxxxxxxx> --- Patch is against mainline 3.6.0. Testing platform was a customer specific i.MX31 board with a 8x1 matrix, without any power-management. Before inclusion in mainline, the patch should be reviewed and tested on other i.MX boards with different keypad matrix setup and esp. other cores. Therefore all recently active committers as well as the original author of the driver are addressed as To/Cc, with a request for review and test. Beside that, there is some kind of regression due to this fix, as unused columns are no longer (erroneously) implicit set to open-drain. Last, on the i.MX31 columns 0..3 are exclusive KPP signals, so the fix could be limited to columns 4..7, albeit I see no real use in that. drivers/input/keyboard/imx_keypad.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c index cdc2526..6650927 100644 --- a/drivers/input/keyboard/imx_keypad.c +++ b/drivers/input/keyboard/imx_keypad.c @@ -362,7 +362,8 @@ static void imx_keypad_inhibit(struct imx_keypad *keypad) writew(reg_val, keypad->mmio_base + KPSR); /* Colums as open drain and disable all rows */ - writew(0xff00, keypad->mmio_base + KPCR); + reg_val = ((keypad->cols_en_mask & 0xff) << 8) | 0x00; + writew(reg_val, keypad->mmio_base + KPCR); } static void imx_keypad_close(struct input_dev *dev) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
