b43: Rewrite LO calibration algorithm

This patch distributes the Local Oscillator calibration bursts over time,
so that calibration only happens when it's actually needed.
Currently we periodically perform a recalibration of the whole table.
The table is huge and this takes lots of time. Additionally only small bits
of the table are actually needed at a given time. So instead of maintaining
a huge table with all possible calibration values, we create dynamic calibration
settings that
a) We only calibrate when they are actually needed.
b) Are cached for some time until they expire.
So a recalibration might happen if we need a calibration setting that's not
cached, or if the active calibration setting expires.
Currently the expire timeout is set to 30 seconds. We may raise that in future.

This patch reduces overall memory consumption by nuking the
huge static calibration tables.

This patch has been tested on several 4306, 4311 and 4318 flavours.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/phy.h b/drivers/net/wireless/b43/phy.h
index 6d165d82217..4aab1090352 100644
--- a/drivers/net/wireless/b43/phy.h
+++ b/drivers/net/wireless/b43/phy.h
@@ -225,7 +225,6 @@ int b43_phy_init(struct b43_wldev *dev);
 void b43_set_rx_antenna(struct b43_wldev *dev, int antenna);
 
 void b43_phy_xmitpower(struct b43_wldev *dev);
-void b43_gphy_dc_lt_init(struct b43_wldev *dev);
 
 /* Returns the boolean whether the board has HardwarePowerControl */
 bool b43_has_hardware_pctl(struct b43_phy *phy);
@@ -252,6 +251,14 @@ struct b43_rfatt_list {
 	u8 max_val;
 };
 
+/* Returns true, if the values are the same. */
+static inline bool b43_compare_rfatt(const struct b43_rfatt *a,
+				     const struct b43_rfatt *b)
+{
+	return ((a->att == b->att) &&
+		(a->with_padmix == b->with_padmix));
+}
+
 /* Baseband Attenuation */
 struct b43_bbatt {
 	u8 att;			/* Attenuation value */
@@ -265,6 +272,13 @@ struct b43_bbatt_list {
 	u8 max_val;
 };
 
+/* Returns true, if the values are the same. */
+static inline bool b43_compare_bbatt(const struct b43_bbatt *a,
+				     const struct b43_bbatt *b)
+{
+	return (a->att == b->att);
+}
+
 /* tx_control bits. */
 #define B43_TXCTL_PA3DB		0x40	/* PA Gain 3dB */
 #define B43_TXCTL_PA2DB		0x20	/* PA Gain 2dB */