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path: root/drivers/i2c/tegra_i2c.c
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Diffstat (limited to 'drivers/i2c/tegra_i2c.c')
-rw-r--r--drivers/i2c/tegra_i2c.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c
index 594e5dd..97f0ca4 100644
--- a/drivers/i2c/tegra_i2c.c
+++ b/drivers/i2c/tegra_i2c.c
@@ -110,7 +110,8 @@ static void i2c_init_controller(struct i2c_bus *i2c_bus)
static void send_packet_headers(
struct i2c_bus *i2c_bus,
struct i2c_trans_info *trans,
- u32 packet_id)
+ u32 packet_id,
+ bool end_with_repeated_start)
{
u32 data;
@@ -132,6 +133,8 @@ static void send_packet_headers(
/* Enable Read if it is not a write transaction */
if (!(trans->flags & I2C_IS_WRITE))
data |= PKT_HDR3_READ_MODE_MASK;
+ if (end_with_repeated_start)
+ data |= PKT_HDR3_REPEAT_START_MASK;
/* Write I2C specific header */
writel(data, &i2c_bus->control->tx_fifo);
@@ -209,7 +212,8 @@ static int send_recv_packets(struct i2c_bus *i2c_bus,
int_status = readl(&control->int_status);
writel(int_status, &control->int_status);
- send_packet_headers(i2c_bus, trans, 1);
+ send_packet_headers(i2c_bus, trans, 1,
+ trans->flags & I2C_USE_REPEATED_START);
words = DIV_ROUND_UP(trans->num_bytes, 4);
last_bytes = trans->num_bytes & 3;
@@ -267,7 +271,7 @@ exit:
}
static int tegra_i2c_write_data(struct i2c_bus *bus, u32 addr, u8 *data,
- u32 len)
+ u32 len, bool end_with_repeated_start)
{
int error;
struct i2c_trans_info trans_info;
@@ -275,6 +279,8 @@ static int tegra_i2c_write_data(struct i2c_bus *bus, u32 addr, u8 *data,
trans_info.address = addr;
trans_info.buf = data;
trans_info.flags = I2C_IS_WRITE;
+ if (end_with_repeated_start)
+ trans_info.flags |= I2C_USE_REPEATED_START;
trans_info.num_bytes = len;
trans_info.is_10bit_address = 0;
@@ -463,7 +469,8 @@ static void tegra_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
}
/* i2c write version without the register address */
-int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len)
+int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len,
+ bool end_with_repeated_start)
{
int rc;
@@ -475,7 +482,8 @@ int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len)
debug("\n");
/* Shift 7-bit address over for lower-level i2c functions */
- rc = tegra_i2c_write_data(bus, chip << 1, buffer, len);
+ rc = tegra_i2c_write_data(bus, chip << 1, buffer, len,
+ end_with_repeated_start);
if (rc)
debug("i2c_write_data(): rc=%d\n", rc);
@@ -516,7 +524,7 @@ static int tegra_i2c_probe(struct i2c_adapter *adap, uchar chip)
if (!bus)
return 1;
reg = 0;
- rc = i2c_write_data(bus, chip, &reg, 1);
+ rc = i2c_write_data(bus, chip, &reg, 1, false);
if (rc) {
debug("Error probing 0x%x.\n", chip);
return 1;
@@ -554,7 +562,7 @@ static int tegra_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
data[alen - i - 1] =
(addr + offset) >> (8 * i);
}
- if (i2c_write_data(bus, chip, data, alen)) {
+ if (i2c_write_data(bus, chip, data, alen, true)) {
debug("i2c_read: error sending (0x%x)\n",
addr);
return 1;
@@ -591,7 +599,7 @@ static int tegra_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
for (i = 0; i < alen; i++)
data[alen - i - 1] = (addr + offset) >> (8 * i);
data[alen] = buffer[offset];
- if (i2c_write_data(bus, chip, data, alen + 1)) {
+ if (i2c_write_data(bus, chip, data, alen + 1, false)) {
debug("i2c_write: error sending (0x%x)\n", addr);
return 1;
}