Subject: Re: [RFC PATCH v1 19/19] rtw88: Add support for the SDIO based RTL8821CS chipset

From: Chris Morgan <[email-masked]>
Date: Tue, 3 Jan 2023 17:01:51 -0600

On Wed, Dec 28, 2022 at 12:30:20AM +0100, Martin Blumenstingl wrote:
> Wire up RTL8821CS chipset support using the new rtw88 SDIO HCI code as
> well as the existing RTL8821C chipset code.
> 

Unfortunately, this doesn't work for me. I applied it on top of 6.2-rc2
master and I get errors during probe (it appears the firmware never
loads).

Relevant dmesg logs are as follows:

[    0.989545] mmc2: new high speed SDIO card at address 0001
[    0.989993] rtw_8821cs mmc2:0001:1: Firmware version 24.8.0, H2C version 12
[    1.005684] rtw_8821cs mmc2:0001:1: sdio write32 failed (0x14): -110
[    1.005737] rtw_8821cs mmc2:0001:1: sdio read32 failed (0x1080): -110
[    1.005789] rtw_8821cs mmc2:0001:1: sdio write32 failed (0x11080): -110
[    1.005840] rtw_8821cs mmc2:0001:1: sdio read8 failed (0x3): -110
[    1.005920] rtw_8821cs mmc2:0001:1: sdio read8 failed (0x1103): -110
[    1.005998] rtw_8821cs mmc2:0001:1: sdio read32 failed (0x80): -110
[    1.006078] rtw_8821cs mmc2:0001:1: sdio read32 failed (0x1700): -110

The error of "sdio read32 failed (0x1700): -110" then repeats several
hundred times, then I get this:

[    1.066294] rtw_8821cs mmc2:0001:1: failed to download firmware
[    1.066367] rtw_8821cs mmc2:0001:1: sdio read16 failed (0x80): -110
[    1.066417] rtw_8821cs mmc2:0001:1: sdio read8 failed (0x100): -110
[    1.066697] rtw_8821cs mmc2:0001:1: failed to setup chip efuse info
[    1.066703] rtw_8821cs mmc2:0001:1: failed to setup chip information
[    1.066839] rtw_8821cs: probe of mmc2:0001:1 failed with error -16

The hardware I am using is an rtl8821cs that I can confirm was working
with a previous driver.

Thank you.

> Signed-off-by: Martin Blumenstingl <[email-masked]>
> ---
>  drivers/net/wireless/realtek/rtw88/Kconfig    | 11 ++++++
>  drivers/net/wireless/realtek/rtw88/Makefile   |  3 ++
>  .../net/wireless/realtek/rtw88/rtw8821cs.c    | 34 +++++++++++++++++++
>  3 files changed, 48 insertions(+)
>  create mode 100644 drivers/net/wireless/realtek/rtw88/rtw8821cs.c
> 
> diff --git a/drivers/net/wireless/realtek/rtw88/Kconfig b/drivers/net/wireless/realtek/rtw88/Kconfig
> index 6b65da81127f..29eb2f8e0eb7 100644
> --- a/drivers/net/wireless/realtek/rtw88/Kconfig
> +++ b/drivers/net/wireless/realtek/rtw88/Kconfig
> @@ -133,6 +133,17 @@ config RTW88_8821CE
>  
>  	  802.11ac PCIe wireless network adapter
>  
> +config RTW88_8821CS
> +	tristate "Realtek 8821CS SDIO wireless network adapter"
> +	depends on MMC
> +	select RTW88_CORE
> +	select RTW88_SDIO
> +	select RTW88_8821C
> +	help
> +	  Select this option will enable support for 8821CS chipset
> +
> +	  802.11ac SDIO wireless network adapter
> +
>  config RTW88_8821CU
>  	tristate "Realtek 8821CU USB wireless network adapter"
>  	depends on USB
> diff --git a/drivers/net/wireless/realtek/rtw88/Makefile b/drivers/net/wireless/realtek/rtw88/Makefile
> index 6105c2745bda..82979b30ae8d 100644
> --- a/drivers/net/wireless/realtek/rtw88/Makefile
> +++ b/drivers/net/wireless/realtek/rtw88/Makefile
> @@ -59,6 +59,9 @@ rtw88_8821c-objs		:= rtw8821c.o rtw8821c_table.o
>  obj-$(CONFIG_RTW88_8821CE)	+= rtw88_8821ce.o
>  rtw88_8821ce-objs		:= rtw8821ce.o
>  
> +obj-$(CONFIG_RTW88_8821CS)	+= rtw88_8821cs.o
> +rtw88_8821cs-objs		:= rtw8821cs.o
> +
>  obj-$(CONFIG_RTW88_8821CU)	+= rtw88_8821cu.o
>  rtw88_8821cu-objs		:= rtw8821cu.o
>  
> diff --git a/drivers/net/wireless/realtek/rtw88/rtw8821cs.c b/drivers/net/wireless/realtek/rtw88/rtw8821cs.c
> new file mode 100644
> index 000000000000..61f82b38cda4
> --- /dev/null
> +++ b/drivers/net/wireless/realtek/rtw88/rtw8821cs.c
> @@ -0,0 +1,34 @@
> +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
> +// Copyright(c) Martin Blumenstingl <[email-masked]>
> +
> +#include <linux/mmc/sdio_func.h>
> +#include <linux/mmc/sdio_ids.h>
> +#include <linux/module.h>
> +#include "sdio.h"
> +#include "rtw8821c.h"
> +
> +static const struct sdio_device_id rtw_8821cs_id_table[] =  {
> +	{
> +		SDIO_DEVICE(SDIO_VENDOR_ID_REALTEK,
> +			    SDIO_DEVICE_ID_REALTEK_RTW8821CS),
> +		.driver_data = (kernel_ulong_t)&rtw8821c_hw_spec,
> +	},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(sdio, rtw_8821cs_id_table);
> +
> +static struct sdio_driver rtw_8821cs_driver = {
> +	.name = "rtw_8821cs",
> +	.probe = rtw_sdio_probe,
> +	.remove = rtw_sdio_remove,
> +	.id_table = rtw_8821cs_id_table,
> +	.drv = {
> +		.pm = &rtw_sdio_pm_ops,
> +		.shutdown = rtw_sdio_shutdown,
> +	}
> +};
> +module_sdio_driver(rtw_8821cs_driver);
> +
> +MODULE_AUTHOR("Martin Blumenstingl <[email-masked]>");
> +MODULE_DESCRIPTION("Realtek 802.11ac wireless 8821cs driver");
> +MODULE_LICENSE("Dual BSD/GPL");
> -- 
> 2.39.0
>