From 4f44dcec7141244ae4baba66c0334cc33c9bbd78 Mon Sep 17 00:00:00 2001 From: Michel Ludwig Date: Wed, 18 Jul 2007 10:26:38 -0300 Subject: [PATCH] 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: Michel Ludwig Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/tm6000/tm6000-i2c.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/staging/tm6000/tm6000-i2c.c b/drivers/staging/tm6000/tm6000-i2c.c index 80252b746699..2a8c169cf07f 100644 --- a/drivers/staging/tm6000/tm6000-i2c.c +++ b/drivers/staging/tm6000/tm6000-i2c.c @@ -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, -- 2.30.2