Commit 4f44dcec authored by Michel Ludwig's avatar Michel Ludwig Committed by Mauro Carvalho Chehab
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V4L/DVB (12780): tm6000: Improve handling of SMBus Write Byte commands followed by a read command. 



SMBus Write Byte commands followed by a read command on the same I2C
address are not sent out to the chip as they wouldn't have any effect.

Signed-off-by: default avatarMichel Ludwig <michel.ludwig@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent a5adfbed

drivers/staging/tm6000/tm6000-i2c.c

+7 −0
Original line number Diff line number Diff line
@@ -141,6 +141,13 @@ static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap, 
					printk(" %02x", msgs[i].buf[byte]);

			}



			/* SMBus Write Byte command followed by a read command */

			if(msgs[i].len == 1 && i+1 < num && msgs[i+1].flags & I2C_M_RD

					    && msgs[i+1].addr == msgs[i].addr) {

				prev_reg = msgs[i].buf[0];

				continue;

			}



			rc = tm6000_read_write_usb (dev,

				USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,

				REQ_16_SET_GET_I2CSEQ,