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authorMichael Krufky <mkrufky@kernellabs.com>2009-08-27 16:58:06 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-09-12 12:19:37 -0300
commit81016b496ee75cfb13d346ee58176d36a5f9c191 (patch)
treeac58c8e2ac88299819c4d5b48629ab32d481db8c /drivers/media/common
parentee8145d5634da4e062f8693f59695b0b2ed6e60d (diff)
V4L/DVB (12578): tda18271: allow drivers to request RF tracking filter calibration during attach
On certain master / slave dual tuner configurations, tuning performance improves when the RF tracking filter calibration is performed sequentially. This patch allows for the bridge driver to specify this behavior in the configuration structure at attach-time. The "cal" module option will continue to override this attach-time configuration: set cal=0 to prevent RF tracking filter calibration on startup, and set cal=1 to force it. Signed-off-by: Michael Krufky <mkrufky@kernellabs.com> Reviewed-by: Steven Toth <stoth@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/common')
-rw-r--r--drivers/media/common/tuners/tda18271-fe.c20
-rw-r--r--drivers/media/common/tuners/tda18271.h3
2 files changed, 21 insertions, 2 deletions
diff --git a/drivers/media/common/tuners/tda18271-fe.c b/drivers/media/common/tuners/tda18271-fe.c
index b1093563015..bc4b004ba7d 100644
--- a/drivers/media/common/tuners/tda18271-fe.c
+++ b/drivers/media/common/tuners/tda18271-fe.c
@@ -27,7 +27,7 @@ module_param_named(debug, tda18271_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debug level "
"(info=1, map=2, reg=4, adv=8, cal=16 (or-able))");
-static int tda18271_cal_on_startup;
+static int tda18271_cal_on_startup = -1;
module_param_named(cal, tda18271_cal_on_startup, int, 0644);
MODULE_PARM_DESC(cal, "perform RF tracking filter calibration on startup");
@@ -1192,10 +1192,25 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
case 0:
goto fail;
case 1:
+ {
/* new tuner instance */
+ int rf_cal_on_startup;
+
priv->gate = (cfg) ? cfg->gate : TDA18271_GATE_AUTO;
priv->role = (cfg) ? cfg->role : TDA18271_MASTER;
priv->config = (cfg) ? cfg->config : 0;
+
+ /* tda18271_cal_on_startup == -1 when cal
+ * module option is unset */
+ if (tda18271_cal_on_startup == -1) {
+ /* honor attach-time configuration */
+ rf_cal_on_startup =
+ ((cfg) && (cfg->rf_cal_on_startup)) ? 1 : 0;
+ } else {
+ /* module option overrides attach configuration */
+ rf_cal_on_startup = tda18271_cal_on_startup;
+ }
+
priv->cal_initialized = false;
mutex_init(&priv->lock);
@@ -1213,11 +1228,12 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
mutex_lock(&priv->lock);
tda18271_init_regs(fe);
- if ((tda18271_cal_on_startup) && (priv->id == TDA18271HDC2))
+ if ((rf_cal_on_startup) && (priv->id == TDA18271HDC2))
tda18271c2_rf_cal_init(fe);
mutex_unlock(&priv->lock);
break;
+ }
default:
/* existing tuner instance */
fe->tuner_priv = priv;
diff --git a/drivers/media/common/tuners/tda18271.h b/drivers/media/common/tuners/tda18271.h
index 53a9892a18d..71bac9593f1 100644
--- a/drivers/media/common/tuners/tda18271.h
+++ b/drivers/media/common/tuners/tda18271.h
@@ -77,6 +77,9 @@ struct tda18271_config {
/* use i2c gate provided by analog or digital demod */
enum tda18271_i2c_gate gate;
+ /* force rf tracking filter calibration on startup */
+ unsigned int rf_cal_on_startup:1;
+
/* some i2c providers cant write all 39 registers at once */
unsigned int small_i2c:1;