From 31d60f1bc589c8721b4287952ea8ebe4556e189d Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Mon, 5 Oct 2015 20:46:37 -0300 Subject: [PATCH] [media] rtl28xxu: return demod reg page from driver cache Return current active rtl2830/rtl2832 register page from the driver cache in order to reduce I2C I/O. Register page is already cached due to I2C write needs. Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c index 5a503a6bb8c5..eb5787a3191e 100644 --- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c +++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c @@ -181,11 +181,17 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], goto err_mutex_unlock; } else if (msg[0].addr == 0x10) { /* method 1 - integrated demod */ - req.value = (msg[0].buf[0] << 8) | (msg[0].addr << 1); - req.index = CMD_DEMOD_RD | dev->page; - req.size = msg[1].len; - req.data = &msg[1].buf[0]; - ret = rtl28xxu_ctrl_msg(d, &req); + if (msg[0].buf[0] == 0x00) { + /* return demod page from driver cache */ + msg[1].buf[0] = dev->page; + ret = 0; + } else { + req.value = (msg[0].buf[0] << 8) | (msg[0].addr << 1); + req.index = CMD_DEMOD_RD | dev->page; + req.size = msg[1].len; + req.data = &msg[1].buf[0]; + ret = rtl28xxu_ctrl_msg(d, &req); + } } else if (msg[0].len < 2) { /* method 2 - old I2C */ req.value = (msg[0].buf[0] << 8) | (msg[0].addr << 1); -- 2.39.5