commit f04b3787bbce4567e28069a9ec97dcd804626ac7 introduced
a regression for the ofdmtable writing.
It incorrectly removed the writing of the high 16bits for
a 32bit table write and initialized the direction identifier
too late.
This patch does also some cleanups to make the code much more
readable and adds a few comments, so non rocket scientists are
also able to understand what this address caching is all about.
Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
Index: wireless-2.6/drivers/net/wireless/b43/b43.h
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/b43/b43.h 2007-12-09 20:50:43.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/b43/b43.h 2007-12-09 20:56:55.000000000 +0100
@@ -545,12 +545,18 @@
u16 initval; //FIXME rename?
- /* OFDM address read/write caching for hardware auto-increment. */
- u16 ofdm_addr;
- u8 ofdm_valid; /* 0: invalid, 1: read, 2: write */
-
/* PHY TX errors counter. */
atomic_t txerr_cnt;
+
+ /* The device does address auto increment for the OFDM tables.
+ * We cache the previously used address here and omit the address
+ * write on the next table access, if possible. */
+ u16 ofdmtab_addr; /* The address currently set in hardware. */
+ enum { /* The last data flow direction. */
+ B43_OFDMTAB_DIRECTION_UNKNOWN = 0,
+ B43_OFDMTAB_DIRECTION_READ,
+ B43_OFDMTAB_DIRECTION_WRITE,
+ } ofdmtab_addr_direction;
};
/* Data structures for DMA transmission, per 80211 core. */
Index: wireless-2.6/drivers/net/wireless/b43/main.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/b43/main.c 2007-12-09 20:50:43.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/b43/main.c 2007-12-09 21:01:27.000000000 +0100
@@ -2266,12 +2266,6 @@
b43_write16(dev, B43_MMIO_POWERUP_DELAY,
dev->dev->bus->chipco.fast_pwrup_delay);
- /* OFDM address caching. */
- phy->ofdm_valid = 0;
-
- /* PHY TX errors counter. */
- atomic_set(&phy->txerr_cnt, B43_PHY_TX_BADNESS_LIMIT);
-
err = 0;
b43dbg(dev->wl, "Chip initialized\n");
out:
@@ -3198,6 +3192,12 @@
phy->channel = 0xFF;
phy->hardware_power_control = !!modparam_hwpctl;
+
+ /* PHY TX errors counter. */
+ atomic_set(&phy->txerr_cnt, B43_PHY_TX_BADNESS_LIMIT);
+
+ /* OFDM-table address caching. */
+ phy->ofdmtab_addr_direction = B43_OFDMTAB_DIRECTION_UNKNOWN;
}
static void setup_struct_wldev_for_init(struct b43_wldev *dev)
Index: wireless-2.6/drivers/net/wireless/b43/tables.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/b43/tables.c 2007-12-09 20:50:43.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/b43/tables.c 2007-12-09 20:55:01.000000000 +0100
@@ -381,13 +381,17 @@
u16 addr;
addr = table + offset;
- if (addr - 1 != phy->ofdm_addr || phy->ofdm_valid != 1) {
+ if ((phy->ofdmtab_addr_direction != B43_OFDMTAB_DIRECTION_READ) ||
+ (addr - 1 != phy->ofdmtab_addr)) {
+ /* The hardware has a different address in memory. Update it. */
b43_phy_write(dev, B43_PHY_OTABLECTL, addr);
- phy->ofdm_valid = 1;
+ phy->ofdmtab_addr_direction = B43_OFDMTAB_DIRECTION_READ;
}
- phy->ofdm_addr = addr;
+ phy->ofdmtab_addr = addr;
return b43_phy_read(dev, B43_PHY_OTABLEI);
+
+ /* Some compiletime assertions... */
assert_sizes();
}
@@ -398,11 +402,13 @@
u16 addr;
addr = table + offset;
- if (addr - 1 != phy->ofdm_addr || phy->ofdm_valid != 2) {
+ if ((phy->ofdmtab_addr_direction != B43_OFDMTAB_DIRECTION_WRITE) ||
+ (addr -1 != phy->ofdmtab_addr)) {
+ /* The hardware has a different address in memory. Update it. */
b43_phy_write(dev, B43_PHY_OTABLECTL, addr);
- phy->ofdm_valid = 2;
+ phy->ofdmtab_addr_direction = B43_OFDMTAB_DIRECTION_WRITE;
}
- phy->ofdm_addr = addr;
+ phy->ofdmtab_addr = addr;
b43_phy_write(dev, B43_PHY_OTABLEI, value);
}
@@ -413,11 +419,13 @@
u16 addr;
addr = table + offset;
- if (addr - 1 != phy->ofdm_addr || phy->ofdm_valid != 1) {
+ if ((phy->ofdmtab_addr_direction != B43_OFDMTAB_DIRECTION_READ) ||
+ (addr - 1 != phy->ofdmtab_addr)) {
+ /* The hardware has a different address in memory. Update it. */
b43_phy_write(dev, B43_PHY_OTABLECTL, addr);
- phy->ofdm_valid = 1;
+ phy->ofdmtab_addr_direction = B43_OFDMTAB_DIRECTION_READ;
}
- phy->ofdm_addr = addr;
+ phy->ofdmtab_addr = addr;
ret = b43_phy_read(dev, B43_PHY_OTABLEQ);
ret <<= 16;
ret |= b43_phy_read(dev, B43_PHY_OTABLEI);
@@ -432,13 +440,16 @@
u16 addr;
addr = table + offset;
- if (addr - 1 != phy->ofdm_addr || phy->ofdm_valid != 2) {
+ if ((phy->ofdmtab_addr_direction != B43_OFDMTAB_DIRECTION_WRITE) ||
+ (addr - 1 != phy->ofdmtab_addr)) {
+ /* The hardware has a different address in memory. Update it. */
b43_phy_write(dev, B43_PHY_OTABLECTL, addr);
- phy->ofdm_valid = 2;
+ phy->ofdmtab_addr_direction = B43_OFDMTAB_DIRECTION_WRITE;
}
- phy->ofdm_addr = addr;
+ phy->ofdmtab_addr = addr;
b43_phy_write(dev, B43_PHY_OTABLEI, value);
+ b43_phy_write(dev, B43_PHY_OTABLEQ, (value >> 16));
}
u16 b43_gtab_read(struct b43_wldev *dev, u16 table, u16 offset)
--
Greetings Michael.
-
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