linux-kernel - Re: [PATCH v3 2/7] usb: misc: onboard_dev: add support for non-hub devices

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Message-ID: <ZcJ9OnYOtUVMu2Yk@google.com>
Date: Tue, 6 Feb 2024 18:40:58 +0000
From: Matthias Kaehlcke <mka@...omium.org>
To: Javier Carrasco <javier.carrasco@...fvision.net>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 2/7] usb: misc: onboard_dev: add support for non-hub
 devices

On Tue, Feb 06, 2024 at 02:59:30PM +0100, Javier Carrasco wrote:
> Most of the functionality this driver provides can be used by non-hub
> devices as well.
> 
> To account for the hub-specific code, add a flag to the device data
> structure and check its value for hub-specific code.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
> ---
>  drivers/usb/misc/onboard_usb_dev.c |  3 +++
>  drivers/usb/misc/onboard_usb_dev.h | 10 ++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c
> index e2e1e1e30c1e..3ac21ec38ac0 100644
> --- a/drivers/usb/misc/onboard_usb_dev.c
> +++ b/drivers/usb/misc/onboard_usb_dev.c
> @@ -123,6 +123,9 @@ static int __maybe_unused onboard_dev_suspend(struct device *dev)
>  	if (onboard_dev->always_powered_in_suspend)
>  		return 0;
>  
> +	if (!onboard_dev->pdata->is_hub)
> +		return onboard_dev_power_off(onboard_dev);

Why turn the device always off when it isn't a hub? It could be a device
with wakeup support.

I really regret making 'off in suspend' the default :(

> +
>  	mutex_lock(&onboard_dev->lock);
>  
>  	list_for_each_entry(node, &onboard_dev->udev_list, list) {
> diff --git a/drivers/usb/misc/onboard_usb_dev.h b/drivers/usb/misc/onboard_usb_dev.h
> index f13d11a84371..ebe83e19d818 100644
> --- a/drivers/usb/misc/onboard_usb_dev.h
> +++ b/drivers/usb/misc/onboard_usb_dev.h
> @@ -9,51 +9,61 @@
>  struct onboard_dev_pdata {
>  	unsigned long reset_us;		/* reset pulse width in us */
>  	unsigned int num_supplies;	/* number of supplies */
> +	bool is_hub;
>  };
>  
>  static const struct onboard_dev_pdata microchip_usb424_data = {
>  	.reset_us = 1,
>  	.num_supplies = 1,
> +	.is_hub = true,

Depending on when 'is_hub' is checked it could be an option to initialize
it at runtime (depending on USB_CLASS_HUB), e.g. in onboard_dev_add_usbdev().
Might not be worth the hassle tough if more than the current check(s) get
added.

>  };
>  
>  static const struct onboard_dev_pdata microchip_usb5744_data = {
>  	.reset_us = 0,
>  	.num_supplies = 2,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata realtek_rts5411_data = {
>  	.reset_us = 0,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata ti_tusb8041_data = {
>  	.reset_us = 3000,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata cypress_hx3_data = {
>  	.reset_us = 10000,
>  	.num_supplies = 2,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata cypress_hx2vl_data = {
>  	.reset_us = 1,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata genesys_gl850g_data = {
>  	.reset_us = 3,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata genesys_gl852g_data = {
>  	.reset_us = 50,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct onboard_dev_pdata vialab_vl817_data = {
>  	.reset_us = 10,
>  	.num_supplies = 1,
> +	.is_hub = true,
>  };
>  
>  static const struct of_device_id onboard_dev_match[] = {
> 
> -- 
> 2.40.1
>