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Add considering for different WLAN beacon interval in coexistence
mechanism.
Because the WLAN beacon period may be not 100 ms, so it's necessary
to consider any beacon period and set timer according to the interval.
Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201112031430.4846-2-pkshih@realtek.com
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Since coexistence issue is related to WL/BT and each digital/analog/rf,
and these issues are often critical with low failure rate, add more
debugging information is helpful to clarify issues.
Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201109085909.9143-11-pkshih@realtek.com
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The original mechanism may cause A2DP glitch during WiFi connecting AP.
Because the original TDMA may decrease too much A2DP slot.
This patch add a timer and variable to let the case A2DP + WL_Connecting
performed more well.
Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201109085909.9143-9-pkshih@realtek.com
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Adjust space and comments, and fix "line over 80 characters" warnings
reported by checkpatch.
Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201109085909.9143-5-pkshih@realtek.com
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Add a set of logic with corresponding coexistence parameters to
handle the situation under BT inquiry/page.
We will set PSTDMA while WL-Busy + BT inquiry/page to separate
WL/BT slots. PSTDMA can protect WL data rate and BT performance.
If WL-Busy + BT inquiry/page and there was BT device paired,
We will set the mechanism to 4Slot PSTDMA.
In 4Slot PSTDMA, the paired devices can perform more smoothly
and prevent some issues trigger from insufficient data.
And to avoid A2DP glitch or disconnection, we will adjust ACL
data priority higher than inquiry/page.
In addition, we found sometimes BT inquiry/page still working
last for seconds after BT had notified inquiry/page finished.
It will lead to A2DP glitch cause of ACL data, inquiry/page
priority toggled. To fix the corner, we add a timer to remain
the inquiry/page status.
And we found WL busy/idle threshold is too sensitive,
it will keep switching in some weak network environment and
coexistence mechanism will switch between TDMA and PSTDMA.
The very frequently switching may destroyed not only the
handshake with AP, but BT performance. And it will trigger
some unexpected error.
To prevent the frequently switching, we add a timer to delay
the status change while WL busy switch to idle.
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200715023324.8600-1-yhchuang@realtek.com
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Add a new entry "coex_info" in debugfs to dump coex's states for
us to debug on coex's issues.
The basic concept for co-existence (coex, usually for WiFi + BT)
is to decide a strategy based on the current status of WiFi and
BT. So, it means the WiFi driver requires to gather information
from BT side and choose a strategy (TDMA/table/HW settings).
Althrough we can easily check the current status of WiFi, e.g.,
from kernel log or just dump the hardware registers, it is still
very difficult for us to gather so many different types of WiFi
states (such as RFE config, antenna, channel/band, TRX, Power
save). Also we will need BT's information that is stored in
"struct rtw_coex". So it is necessary for us to have a debugfs
that can dump all of the WiFi/BT information required.
Note that to debug on coex related issues, we usually need a
longer period of time of coex_info dump every 2 seconds (for
example, 30 secs, so we should have 15 times of coex_info's
dump).
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Reviewed-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200313033008.20070-2-yhchuang@realtek.com
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Power amplifiers are not linear components, and require DPK to
reduce its nonlinearity. DPK is called Digital Pre-distortion
Calibration, can be used to compensate the output of power.
DPK tracking is in charge of tracking the thermal changes. And
it then shifts the power curve accordingly, which makes the
power output remains linear even if the PA works in different
temperature.
To perform DPK, the parameter table should also be updated.
And the table will be applied when device is powered on.
Then DPK will reference the values to calibrate.
Signed-off-by: Tzu-En Huang <tehuang@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Both RTL8822BE/RTL8822CE are WiFi + BT combo chips. Since
WiFi and BT use 2.4GHz to transmit, it is important to
make sure they run concurrently without interfering each
other. To achieve this, WiFi driver requires a mechanism
to collaborate with BT, whether they share the antenna(s)
or not.
The final decision made by the co-existence mechanism is
to choose a proper strategy, or called "tdma/table", and
inform either firmware or hardware of the strategy.
To choose a strategy, co-existence mechanism needs to
have enough information from WiFi and BT.
BT information is provided through firmware C2H.
The contents describe the current status of BT, such as
if BT is connected or is idle, or the profile that is
being used.
WiFi information can be provided by WiFi itself. The WiFi
driver will call various of "notify" functions each time
the state of WiFi changed, such as WiFi is going to switch
channel or is connected. Also WiFi driver can know if it
shares antenna with BT by reading efuse content. Antenna
configuration of the module will finally get a different
strategy.
Upon receiving any information from WiFi or BT, the WiFi
driver will run the co-existence mechanism immediately.
It will set the RF antenna configuration according to the
strategy through the TDMA H2C to firmware and a hardware
table. Based on the tdma/table, WiFi + BT should work with
each other, and having a better user experience.
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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