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wl1251: fix scan behaviour while not associated

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With a dissasociated card I often encoutered very long scan delays.

My guess is that it has something to do with the cards DTIM handling and
another firmware bug mentioned in the TI WLAN driver, which is described as
the card may never end scanning if the channel is overloaded because it
can't send probe requests. I think the firmware somehow also tries to
receive DTIM messages when the BSSID is not set. Therefore most of the time
it waits for DTIM messages and can't do scanning work.

Anyway we can workaround this misbehaviour by setting the HIGH_PRIORITY
bit for scans in disassociated state.

Signed-off-by: David Gnedt <david.gnedt@davizone.at>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
David Gnedt
2014-01-07 13:04:53 +01:00
committed by John W. Linville
parent 300e5fd160
commit 64322e28d3
3 changed files with 17 additions and 1 deletions
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12
drivers/net/wireless/ti/wl1251/cmd.c
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@@ -3,6 +3,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/crc7.h>
#include <linux/etherdevice.h>
#include "wl1251.h"
#include "reg.h"
@@ -410,7 +411,9 @@ int wl1251_cmd_scan(struct wl1251 *wl, u8 *ssid, size_t ssid_len,
struct wl1251_cmd_scan *cmd;
int i, ret = 0;
wl1251_debug(DEBUG_CMD, "cmd scan");
wl1251_debug(DEBUG_CMD, "cmd scan channels %d", n_channels);
WARN_ON(n_channels > SCAN_MAX_NUM_OF_CHANNELS);
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd)
@@ -421,6 +424,13 @@ int wl1251_cmd_scan(struct wl1251 *wl, u8 *ssid, size_t ssid_len,
CFG_RX_MGMT_EN |
CFG_RX_BCN_EN);
cmd->params.scan_options = 0;
/*
* Use high priority scan when not associated to prevent fw issue
* causing never-ending scans (sometimes 20+ minutes).
* Note: This bug may be caused by the fw's DTIM handling.
*/
if (is_zero_ether_addr(wl->bssid))
cmd->params.scan_options |= WL1251_SCAN_OPT_PRIORITY_HIGH;
cmd->params.num_channels = n_channels;
cmd->params.num_probe_requests = n_probes;
cmd->params.tx_rate = cpu_to_le16(1 << 1); /* 2 Mbps */