[PATCH v6] ath10k: provide survey info as accumulated data

[Kalle Valo <kvalo@codeaurora.org>]

From: Venkateswara Naralasetty <vnaralas@codeaurora.org>

It is expected that the returned counters by .get_survey are monotonic
increasing. But the data from ath10k gets reset to zero regularly. Channel
active/busy time are then showing incorrect values (less than previous or
sometimes zero) for the currently active channel during successive survey
dump commands.

example:

  $ iw dev wlan0 survey dump
  Survey data from wlan0
  	frequency:                      5180 MHz [in use]
  	channel active time:            54995 ms
  	channel busy time:              432 ms
  	channel receive time:           0 ms
  	channel transmit time:          59 ms
  ...

  $ iw dev wlan0 survey dump
  Survey data from wlan0
  	frequency:                      5180 MHz [in use]
  	channel active time:            32592 ms
  	channel busy time:              254 ms
  	channel receive time:           0 ms
  	channel transmit time:          0 ms
  ...

The correct way to handle this is to use the non-clearing
WMI_BSS_SURVEY_REQ_TYPE_READ wmi_bss_survey_req_type. The firmware will
then accumulate the survey data and handle wrap arounds.

Tested on:

* QCA9984 hw1.0 firmware 10.4-3.5.3-00057
* QCA988X hw2.0 firmware 10.2.4-1.0-00047
* QCA9888 hw2.0 firmware 10.4-3.9.0.2-00024
* QCA4019 hw1.0 firmware 10.4-3.6-00140

Fixes: fa7937e3d5c2 ("ath10k: update bss channel survey information")
Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Tested-by: Markus Theil <markus.theil@tu-ilmenau.de>
Tested-by: John Deere <24601deerej@gmail.com>
[sven@narfation.org: adjust commit message]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

v6:

* cc linux-wireless so patchwork sees this

v5:
* add additional tested devices
* restructure commit message

v4:
 * updated signed-off-by

v3:
 * Rebased on TOT and added Tested-by

Everything expect QCA9984 hw1.0 firmware 10.4-3.5.3-00057 was also tested
by Sven.

 drivers/net/wireless/ath/ath10k/mac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 919d15584d4a..77daca67a8e1 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -7283,7 +7283,7 @@ ath10k_mac_update_bss_chan_survey(struct ath10k *ar,
 				  struct ieee80211_channel *channel)
 {
 	int ret;
-	enum wmi_bss_survey_req_type type = WMI_BSS_SURVEY_REQ_TYPE_READ_CLEAR;
+	enum wmi_bss_survey_req_type type = WMI_BSS_SURVEY_REQ_TYPE_READ;
 
 	lockdep_assert_held(&ar->conf_mutex);
 
-- 
2.7.4