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124 lines
2.8 KiB
Diff
124 lines
2.8 KiB
Diff
From b9607c9083b767eac26df1d39a030f3cba5d3ae3 Mon Sep 17 00:00:00 2001
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From: Kurt Mahan <kmahan@freescale.com>
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Date: Fri, 18 Jul 2008 12:40:04 -0600
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Subject: [PATCH] Increase timeouts on I2C bus.
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LTIBName: m547x-8x-i2c-timeout-fix
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Signed-off-by: Shrek Wu <b16972@freescale.com>
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---
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drivers/i2c/busses/i2c-mcf548x.c | 40 +++++++++++++++++++++++++++++--------
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1 files changed, 31 insertions(+), 9 deletions(-)
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--- a/drivers/i2c/busses/i2c-mcf548x.c
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+++ b/drivers/i2c/busses/i2c-mcf548x.c
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@@ -43,8 +43,8 @@ static struct i2c_adapter i2c_mcf_board_
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.id = I2C_HW_MPC107,
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.algo_data = &i2c_mcf_board_data,
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.class = I2C_CLASS_HWMON,
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- .timeout = 1,
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- .retries = 1
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+ .timeout = 100,
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+ .retries = 2
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};
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/*
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* static void i2c_start()
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@@ -105,7 +105,7 @@ wait_for_bb(
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for (i = 0; i < adap->timeout; i++) {
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if (!(MCF_I2SR & MCF_I2SR_IBB))
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return 0;
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- udelay(10);
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+ udelay(100);
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}
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printk(KERN_ERR "%s: timeout", __FUNCTION__);
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return -ETIMEDOUT;
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@@ -124,7 +124,7 @@ wait_for_not_bb(
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for (i = 0; i < adap->timeout; i++) {
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if (MCF_I2SR & MCF_I2SR_IBB)
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return 0;
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- udelay(10);
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+ udelay(100);
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}
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printk(KERN_ERR "%s: timeout", __FUNCTION__);
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return -ETIMEDOUT;
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@@ -146,7 +146,7 @@ wait_xfer_done(
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MCF_I2SR &= ~MCF_I2SR_IIF;
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return 0;
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}
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- udelay(1);
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+ udelay(10);
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}
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printk(KERN_ERR "%s: timeout", __FUNCTION__);
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return -ETIMEDOUT;
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@@ -166,7 +166,7 @@ i2c_set_addr(
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) {
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unsigned short flags = msg->flags;
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unsigned char addr;
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-
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+ MCF_I2CR |= MCF_I2CR_MTX;
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if ((flags & I2C_M_TEN)) {
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/* 10 bit address not supported yet */
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return -EIO;
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@@ -269,7 +269,7 @@ mcf_sendbytes(
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i2c_stop(adap);
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wait_for_bb(adap);
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} else {
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- i2c_repstart(adap);
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+ /* i2c_repstart(adap);*/
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}
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return (i);
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@@ -330,7 +330,7 @@ mcf_readbytes(
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i2c_stop(adap);
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wait_for_bb(adap);
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} else {
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- i2c_repstart(adap);
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+ /* i2c_repstart(adap);*/
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}
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return (i+1);
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@@ -380,6 +380,27 @@ mcf_xfer(
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wait_for_bb(adap);
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for (i = 0; ret >= 0 && i < num; i++) {
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+ if (MCF_I2SR & MCF_I2SR_IBB) {
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+ MCF_I2ICR = 0x00;
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+ MCF_I2CR = 0x00;
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+ MCF_I2CR = 0x0A;
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+ timeout = MCF_I2DR;
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+ MCF_I2SR = 0x00;
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+ MCF_I2CR = 0x00;
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+ MCF_I2ICR = 0x01;
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+ }
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+ /* setup SCL clock */
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+ MCF_I2FDR = get_clock(adap);
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+ /* set slave address */
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+ MCF_I2AR = get_own(adap);
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+ /* enable I2C module */
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+ MCF_I2CR = MCF_I2CR_IEN;
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+
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+ MCF_I2CR |= MCF_I2CR_TXAK;
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+
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+ /* Check for bus busy */
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+ wait_for_bb(adap);
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+
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pmsg = &msgs[i];
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printk(KERN_DEBUG "i2c-algo-mcf: Doing %s %d bytes "
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@@ -388,7 +409,7 @@ mcf_xfer(
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pmsg->len, pmsg->addr, i + 1, num);
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/* Send START */
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- if (i == 0)
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+ /*if (i == 0)*/
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i2c_start(adap);
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/* Wait for Bus Busy */
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@@ -440,6 +461,7 @@ mcf_xfer(
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"%d bytes.\n", ret);
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}
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}
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+ MCF_I2CR = 0;
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}
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/* Disable I2C module */
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