From 64322e28d3f91a196c0e86de2790cdd338a74c28 Mon Sep 17 00:00:00 2001 From: David Gnedt Date: Tue, 7 Jan 2014 13:04:53 +0100 Subject: [PATCH] wl1251: fix scan behaviour while not associated MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Pali Rohár Signed-off-by: Pavel Machek Signed-off-by: John W. Linville --- drivers/net/wireless/ti/wl1251/cmd.c | 12 +++++++++++- drivers/net/wireless/ti/wl1251/cmd.h | 5 +++++ drivers/net/wireless/ti/wl1251/main.c | 1 + 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ti/wl1251/cmd.c b/drivers/net/wireless/ti/wl1251/cmd.c index 6822b845efc1..40f8d3e52a35 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.c +++ b/drivers/net/wireless/ti/wl1251/cmd.c @@ -3,6 +3,7 @@ #include #include #include +#include #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 */ diff --git a/drivers/net/wireless/ti/wl1251/cmd.h b/drivers/net/wireless/ti/wl1251/cmd.h index ee4f2b391822..126f273f0b66 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.h +++ b/drivers/net/wireless/ti/wl1251/cmd.h @@ -167,6 +167,11 @@ struct cmd_read_write_memory { #define CMDMBOX_HEADER_LEN 4 #define CMDMBOX_INFO_ELEM_HEADER_LEN 4 +#define WL1251_SCAN_OPT_PASSIVE 1 +#define WL1251_SCAN_OPT_5GHZ_BAND 2 +#define WL1251_SCAN_OPT_TRIGGERD_SCAN 4 +#define WL1251_SCAN_OPT_PRIORITY_HIGH 8 + #define WL1251_SCAN_MIN_DURATION 30000 #define WL1251_SCAN_MAX_DURATION 60000 diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c index 3291ffa95273..4d89ac800e78 100644 --- a/drivers/net/wireless/ti/wl1251/main.c +++ b/drivers/net/wireless/ti/wl1251/main.c @@ -930,6 +930,7 @@ static int wl1251_op_hw_scan(struct ieee80211_hw *hw, ret = wl1251_cmd_scan(wl, ssid, ssid_len, req->channels, req->n_channels, WL1251_SCAN_NUM_PROBES); if (ret < 0) { + wl1251_debug(DEBUG_SCAN, "scan failed %d", ret); wl->scanning = false; goto out_idle; } -- 2.20.1