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[media] rtl28xxu: return demod reg page from driver cache

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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 <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2015-10-05 20:46:37 -03:00 committed by Mauro Carvalho Chehab
parent 95847f4010
commit 31d60f1bc5
1 changed files with 11 additions and 5 deletions
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16
drivers/media/usb/dvb-usb-v2/rtl28xxu.c
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@ -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);