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[media] r820t: Allow disabling IMR callibration

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The rtl-sdr library disabled IMR callibration. While I'm not sure
yet why, it could be a good idea to add a modprobe parameter here,
to allow to also disable it. There are two rationale behind it:
- It helps to compare USB dumps between rtl-sdr and the Kernel module;
- If rtl-sdr disabled it, perhaps there's a good reason (e. g. it
  might not be actually working, or it might be causing some trouble).
For both cases, it seems useful to add a modprobe parameter to allow
testing the device with both configurations.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>
This commit is contained in:
Mauro Carvalho Chehab 2013-04-11 10:59:12 -03:00
parent 6596e88043
commit 52775fd5b5
1 changed files with 19 additions and 4 deletions
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23
drivers/media/tuners/r820t.c
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@ -56,6 +56,11 @@ static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");
static int no_imr_cal;
module_param(no_imr_cal, int, 0444);
MODULE_PARM_DESC(no_imr_cal, "Disable IMR calibration at module init");
/*
* enums and structures
*/
@ -87,7 +92,8 @@ struct r820t_priv {
u32 int_freq;
u8 fil_cal_code;
bool imr_done;
bool has_lock;
bool init_done;
struct r820t_sect_type imr_data[NUM_IMR];
/* Store current mode */
@ -95,8 +101,6 @@ struct r820t_priv {
enum v4l2_tuner_type type;
v4l2_std_id std;
u32 bw; /* in MHz */
bool has_lock;
};
struct r820t_freq_range {
@ -1999,7 +2003,7 @@ static int r820t_imr_callibrate(struct r820t_priv *priv)
int rc, i;
int xtal_cap = 0;
if (priv->imr_done)
if (priv->init_done)
return 0;
/* Initialize registers */
@ -2024,6 +2028,16 @@ static int r820t_imr_callibrate(struct r820t_priv *priv)
priv->xtal_cap_sel = xtal_cap;
}
/*
* Disables IMR callibration. That emulates the same behaviour
* as what is done by rtl-sdr userspace library. Useful for testing
*/
if (no_imr_cal) {
priv->init_done = true;
return 0;
}
/* Initialize registers */
rc = r820t_write(priv, 0x05,
r820t_init_array, sizeof(r820t_init_array));
@ -2050,6 +2064,7 @@ static int r820t_imr_callibrate(struct r820t_priv *priv)
if (rc < 0)
return rc;
priv->init_done = true;
priv->imr_done = true;
return 0;