diff options
| -rw-r--r-- | arch/arm/imx-common/i2c-mxv7.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/arch/arm/imx-common/i2c-mxv7.c b/arch/arm/imx-common/i2c-mxv7.c index ff72b1a..d358d6c 100644 --- a/arch/arm/imx-common/i2c-mxv7.c +++ b/arch/arm/imx-common/i2c-mxv7.c @@ -1,5 +1,6 @@ /* * Copyright (C) 2012 Boundary Devices Inc. + * Copyright (C) 2014-2016 Freescale Semiconductor, Inc. * * SPDX-License-Identifier: GPL-2.0+ */ @@ -33,13 +34,36 @@ int force_idle_bus(void *priv) printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__, sda, scl, p->sda.gp, p->scl.gp); + gpio_direction_output(p->scl.gp, 1); + udelay(1000); /* Send high and low on the SCL line */ for (i = 0; i < 9; i++) { - gpio_direction_output(p->scl.gp, 0); + gpio_direction_output(p->scl.gp, 1); udelay(50); - gpio_direction_input(p->scl.gp); + gpio_direction_output(p->scl.gp, 0); udelay(50); } + + /* Simulate the NACK */ + gpio_direction_output(p->sda.gp, 1); + udelay(50); + gpio_direction_output(p->scl.gp, 1); + udelay(50); + gpio_direction_output(p->scl.gp, 0); + udelay(50); + + /* Simulate the STOP signal */ + gpio_direction_output(p->sda.gp, 0); + udelay(50); + gpio_direction_output(p->scl.gp, 1); + udelay(50); + gpio_direction_output(p->sda.gp, 1); + udelay(50); + + /* Get the bus status */ + gpio_direction_input(p->sda.gp); + gpio_direction_input(p->scl.gp); + start_time = get_timer(0); for (;;) { sda = gpio_get_value(p->sda.gp); |