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i2c: iproc: add support for SMBUS quick cmd 

Add support for SMBUS quick command.

SMBUS quick command passes single bit of information to the
slave (target) device. Can be used to turn slave device on or off.

By default i2c_detect tool uses the smbus quick cmd to try and
detect devices. Without this support it will not detect some slaves.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Rayagonda Kokatanur 2020-03-22 23:53:22 +05:30 committed by Wolfram Sang
parent 6b98bf01d2
commit e14d796d83
1 changed files with 7 additions and 3 deletions
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10
drivers/i2c/busses/i2c-bcm-iproc.c
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@ -79,6 +79,7 @@
#define M_CMD_STATUS_RX_FIFO_FULL 0x6
#define M_CMD_PROTOCOL_SHIFT 9
#define M_CMD_PROTOCOL_MASK 0xf
#define M_CMD_PROTOCOL_QUICK 0x0
#define M_CMD_PROTOCOL_BLK_WR 0x7
#define M_CMD_PROTOCOL_BLK_RD 0x8
#define M_CMD_PROTOCOL_PROCESS 0xa
@ -765,7 +766,11 @@ static int bcm_iproc_i2c_xfer_internal(struct bcm_iproc_i2c_dev *iproc_i2c,
* number of bytes to read
*/
val = BIT(M_CMD_START_BUSY_SHIFT);
if (msg->flags & I2C_M_RD) {
if (msg->len == 0) {
/* SMBUS QUICK Command (Read/Write) */
val |= (M_CMD_PROTOCOL_QUICK << M_CMD_PROTOCOL_SHIFT);
} else if (msg->flags & I2C_M_RD) {
u32 protocol;
iproc_i2c->rx_bytes = 0;
@ -827,8 +832,7 @@ static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
{
u32 val;
/* We do not support the SMBUS Quick command */
val = I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
val = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
if (adap->algo->reg_slave)
val |= I2C_FUNC_SLAVE;