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Commit abfac0b6 authored by Gianluca Gennari's avatar Gianluca Gennari Committed by Mauro Carvalho Chehab
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[media] as102: set optimal eLNA config values for each device 



Ryley and me tested several eLNA configuration values with both a rooftop
and a portable antenna.

Ryley fuond out that the best value for his Elgato stick is indeed the current
default value 0xC0.

Instead, my stick is not capable of tuning VHF channels with 0xC0. With 0x80,
VHF works but the tuner sensitivity with the portable antenna is poor.
Instead, the value 0xA0 works with VHF and also gives good performance with
both the rooftop and the portable antenna.

So we concluded that devices built on the reference design work best with 0xA0,
while custom designs (Elgato, PCTV) seem to require 0xC0.

I also removed the unused parameter "minor" in struct as102_dev_t.

Signed-off-by: default avatarGianluca Gennari <gennarone@gmail.com>
Signed-off-by: default avatarRyley Angus <rangus@student.unimelb.edu.au>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent abf9d005

drivers/staging/media/as102/as102_drv.h

+1 −1
Original line number Diff line number Diff line
@@ -76,7 +76,7 @@ struct as102_dev_t { 
	struct as10x_bus_adapter_t bus_adap;

	struct list_head device_entry;

	struct kref kref;

	unsigned long minor;

	uint8_t elna_cfg;



	struct dvb_adapter dvb_adap;

	struct dvb_frontend dvb_fe;

drivers/staging/media/as102/as102_fe.c

+1 −1
Original line number Diff line number Diff line
@@ -265,7 +265,7 @@ static int as102_fe_ts_bus_ctrl(struct dvb_frontend *fe, int acquire) 


	if (acquire) {

		if (elna_enable)

			as10x_cmd_set_context(&dev->bus_adap, 1010, 0xC0);

			as10x_cmd_set_context(&dev->bus_adap, CONTEXT_LNA, dev->elna_cfg);



		ret = as10x_cmd_turn_on(&dev->bus_adap);

	} else {

drivers/staging/media/as102/as102_usb_drv.c

+14 −1
Original line number Diff line number Diff line
@@ -57,6 +57,17 @@ static const char * const as102_device_names[] = { 
	NULL /* Terminating entry */

};



/* eLNA configuration: devices built on the reference design work best

   with 0xA0, while custom designs seem to require 0xC0 */

static uint8_t const as102_elna_cfg[] = {

	0xA0,

	0xC0,

	0xC0,

	0xA0,

	0xA0,

	0x00 /* Terminating entry */

};



struct usb_driver as102_usb_driver = {

	.name		= DRIVER_FULL_NAME,

	.probe		= as102_usb_probe,
@@ -371,8 +382,10 @@ static int as102_usb_probe(struct usb_interface *intf, 
	/* Assign the user-friendly device name */

	for (i = 0; i < (sizeof(as102_usb_id_table) /

			 sizeof(struct usb_device_id)); i++) {

		if (id == &as102_usb_id_table[i])

		if (id == &as102_usb_id_table[i]) {

			as102_dev->name = as102_device_names[i];

			as102_dev->elna_cfg = as102_elna_cfg[i];

		}

	}



	if (as102_dev->name == NULL)