From: Keith Packard <keithp@keithp.com>
Date: Sat, 2 Jun 2012 23:56:41 +0000 (-0700)
Subject: altos: Reset i2c controller at boot time
X-Git-Tag: 1.0.9.6~129
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=97317d332f21c42860747c4ecde633bd0228ef52;hp=64e2e66a5239541b15f43172655cfb3560bec79b

altos: Reset i2c controller at boot time

In case it's wedged.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/src/stm/ao_i2c_stm.c b/src/stm/ao_i2c_stm.c
index d82342db..c205706d 100644
--- a/src/stm/ao_i2c_stm.c
+++ b/src/stm/ao_i2c_stm.c
@@ -362,8 +362,12 @@ void
 ao_i2c_channel_init(uint8_t index)
 {
 	struct stm_i2c	*stm_i2c = ao_i2c_stm_info[index].stm_i2c;
+	int i;
 
 	/* Turn I2C off while configuring */
+	stm_i2c->cr1 = (1 << STM_I2C_CR1_SWRST);
+	for (i = 0; i < 100; i++)
+		asm("nop");
 	stm_i2c->cr1 = 0;
 	stm_i2c->cr2 = AO_STM_I2C_CR2;