Date:   Fri, 10 Mar 2023 20:16:06 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-wireless@...r.kernel.org
Cc:     Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-mmc@...r.kernel.org, Chris Morgan <macroalpha82@...il.com>,
        Nitin Gupta <nitin.gupta981@...il.com>,
        Neo Jou <neojou@...il.com>, Pkshih <pkshih@...ltek.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Subject: Re: [PATCH v2 RFC 0/9] rtw88: Add SDIO support

On 3/10/23 14:29, Martin Blumenstingl wrote:
> Recently the rtw88 driver has gained locking support for the "slow" bus
> types (USB, SDIO) as part of USB support. Thanks to everyone who helped
> make this happen!
> 
> Based on the USB work (especially the locking part and various
> bugfixes) this series adds support for SDIO based cards. It's the
> result of a collaboration between Jernej and myself. Neither of us has
> access to the rtw88 datasheets. All of our work is based on studying
> the RTL8822BS and RTL8822CS vendor drivers and trial and error.
> 
> Jernej and myself have tested this with RTL8822BS and RTL8822CS cards.
> Other users have confirmed that RTL8821CS support is working as well.
> RTL8723DS may also work (we tried our best to handle rtw_chip_wcpu_11n
> where needed) but has not been tested at this point.
> 
> Jernej's results with a RTL8822BS:
> - Main functionality works
> - Had a case where no traffic got across the link until he issued a
>    scan
> 
> My results with a RTL8822CS:
> - 2.4GHz and 5GHz bands are both working
> - TX throughput on a 5GHz network is between 50 Mbit/s and 90 Mbit/s
> - RX throughput on a 5GHz network is at 19 Mbit/s (this seems to be
>    an combination of the location of my board and the cheap antenna
>    which are both hurting RX performance)
> 
> A user shared his results on his own RTL8822CS off-list with me:
> - 50Mbit/s throughput in both directions
> 
> A user shared his results on RTL8821CS off-list with me:
> - 50Mbps down and 25Mbps on a 5GHz network
> 
> Why is this an RFC?
> - I think it's worth to get another round of feedback from the rtw88
>    maintainers
> - As with most patches: testing is very welcome. If things are working
>    fine then a Tested-by is appreciated (with some details about the
>    card, throughput, ...). If something doesn't work for you: please
>    still report back so we can investigate that problem!
> 
> Changes since v1 at [0]:
> - removed patches 1-8 as they have been submitted and separately (they
>    were indepdent and this helped cutting down the size of this series)
> - dropped patch "rtw88: ps: Increase LEAVE_LPS_TRY_CNT for SDIO based
>    chipsets" as the underlying issue has been fixed - most likely with
>    upstream commit 823092a53556eb ("wifi: rtw88: fix race condition
>    when doing H2C command")
> - rework the code so we don't need a new HCI specific power_switch
>    callback by utilizing the RTW_FLAG_POWERON flag which was recently
>    introduced
> - various patches include the feedback from reviewers and build
>    testing robots (see the individual patches for details)
> 
> 
> [0] https://lore.kernel.org/lkml/a2449a2d1e664bcc8962af4667aa1290@realtek.com/T/
> 
> 
> Jernej Skrabec (1):
>    wifi: rtw88: Add support for the SDIO based RTL8822BS chipset
> 
> Martin Blumenstingl (8):
>    wifi: rtw88: Clear RTW_FLAG_POWERON early in rtw_mac_power_switch()
>    wifi: rtw88: sdio: Add HCI implementation for SDIO based chipsets
>    wifi: rtw88: mac: Support SDIO specific bits in the power on sequence
>    wifi: rtw88: main: Add the {cpwm,rpwm}_addr for SDIO based chipsets
>    wifi: rtw88: main: Reserve 8 bytes of extra TX headroom for SDIO cards
>    mmc: sdio: add Realtek SDIO vendor ID and various wifi device IDs
>    wifi: rtw88: Add support for the SDIO based RTL8822CS chipset
>    wifi: rtw88: Add support for the SDIO based RTL8821CS chipset
> 
>   drivers/net/wireless/realtek/rtw88/Kconfig    |   36 +
>   drivers/net/wireless/realtek/rtw88/Makefile   |   12 +
>   drivers/net/wireless/realtek/rtw88/debug.h    |    1 +
>   drivers/net/wireless/realtek/rtw88/mac.c      |   51 +-
>   drivers/net/wireless/realtek/rtw88/mac.h      |    1 -
>   drivers/net/wireless/realtek/rtw88/main.c     |    9 +-
>   drivers/net/wireless/realtek/rtw88/reg.h      |   12 +
>   .../net/wireless/realtek/rtw88/rtw8821cs.c    |   35 +
>   .../net/wireless/realtek/rtw88/rtw8822bs.c    |   35 +
>   .../net/wireless/realtek/rtw88/rtw8822cs.c    |   35 +
>   drivers/net/wireless/realtek/rtw88/sdio.c     | 1251 +++++++++++++++++
>   drivers/net/wireless/realtek/rtw88/sdio.h     |  175 +++
>   include/linux/mmc/sdio_ids.h                  |    9 +
>   13 files changed, 1654 insertions(+), 8 deletions(-)
>   create mode 100644 drivers/net/wireless/realtek/rtw88/rtw8821cs.c
>   create mode 100644 drivers/net/wireless/realtek/rtw88/rtw8822bs.c
>   create mode 100644 drivers/net/wireless/realtek/rtw88/rtw8822cs.c
>   create mode 100644 drivers/net/wireless/realtek/rtw88/sdio.c
>   create mode 100644 drivers/net/wireless/realtek/rtw88/sdio.h

Martin,

I am not qualified to review the code, but I am integrating this version into my 
rtw88 repo at GitHub.com.

It is essential that a successful build is possible after every patch is applied 
so that an arbitrary bisection will not fail to build. This patch series fails 
after #2 is committed. File mac.c needs symbol SDIO_LOCAL_OFFSET, which was 
moved from mac.h to sdio.h. I resolved this be including sdio.h in mac.c. This 
breaks #3, where you add the include to mac.c. It needs to happen one patch earlier.

The other problem for my repo is that it cannot modify 
include/linux/mmc/sdio_ids.h, thus I have to create a local sdio_ids.h to 
contain the new definitions. Once your patches are in the kernel, I will be able 
to eliminate this work around.

I do not have any rtw88 SDIO devices, thus I will not be able to test, but I 
will pass any information that I get from my users.

Larry

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