linux-kernel - Re: [RFC PATCH v1 13/14] usb:cdns3: Adds debugging function.

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Date:   Sat, 03 Nov 2018 12:14:37 -0700
From:   Joe Perches <joe@...ches.com>
To:     Pawel Laszczak <pawell@...ence.com>, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, rogerq@...com,
        linux-kernel@...r.kernel.org, adouglas@...ence.com,
        jbergsagel@...com, peter.chen@....com, pjez@...ence.com,
        kurahul@...ence.com
Subject: Re: [RFC PATCH v1 13/14] usb:cdns3: Adds debugging function.

On Sat, 2018-11-03 at 17:51 +0000, Pawel Laszczak wrote:
> Patch implements some function used for debugging driver.
[]
> +static inline char *cdns3_decode_ep_irq(u32 ep_sts, const char *ep_name)
> +{
> +	static char str[256];
> +	int ret;
> +
> +	ret = sprintf(str, "IRQ for %s: %08x ", ep_name, ep_sts);
> +
> +	if (ep_sts & EP_STS_SETUP)
> +		ret += sprintf(str + ret, "SETUP ");
> +	if (ep_sts & EP_STS_IOC)
> +		ret += sprintf(str + ret, "IOC ");
> +	if (ep_sts & EP_STS_ISP)
> +		ret += sprintf(str + ret, "ISP ");
> +	if (ep_sts & EP_STS_DESCMIS)
> +		ret += sprintf(str + ret, "DESCMIS ");
> +	if (ep_sts & EP_STS_STREAMR)
> +		ret += sprintf(str + ret, "STREAMR ");
> +	if (ep_sts & EP_STS_MD_EXIT)
> +		ret += sprintf(str + ret, "MD_EXIT ");
> +	if (ep_sts & EP_STS_TRBERR)
> +		ret += sprintf(str + ret, "TRBERR ");
> +	if (ep_sts & EP_STS_NRDY)
> +		ret += sprintf(str + ret, "NRDY ");
> +	if (ep_sts & EP_STS_PRIME)
> +		ret += sprintf(str + ret, "PRIME ");
> +	if (ep_sts & EP_STS_SIDERR)
> +		ret += sprintf(str + ret, "SIDERRT ");
> +	if (ep_sts & EP_STS_OUTSMM)
> +		ret += sprintf(str + ret, "OUTSMM ");
> +	if (ep_sts & EP_STS_ISOERR)
> +		ret += sprintf(str + ret, "ISOERR ");
> +	if (ep_sts & EP_STS_IOT)
> +		ret += sprintf(str + ret, "IOT ");
> +
> +	return str;
> +}

This bit is pretty unsightly.
Especially the static in each inline

> +
> +char *cdns3_decode_epx_irq(struct cdns3_endpoint *priv_ep)
> +{
> +	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
> +
> +	return cdns3_decode_ep_irq(readl(&priv_dev->regs->ep_sts),
> +				   priv_ep->name);
> +}
> +
> +char *cdns3_decode_ep0_irq(struct cdns3_device *priv_dev, int dir)
> +{
> +	if (dir)
> +		return cdns3_decode_ep_irq(readl(&priv_dev->regs->ep_sts),
> +					   "ep0IN");
> +	else
> +		return cdns3_decode_ep_irq(readl(&priv_dev->regs->ep_sts),
> +					   "ep0OUT");
> +}
> +
[]
> diff --git a/drivers/usb/cdns3/ep0.c b/drivers/usb/cdns3/ep0.c
[]
> @@ -604,12 +604,15 @@ void cdns3_check_ep0_interrupt_proceed(struct cdns3_device *priv_dev, int dir)
>  	cdns3_select_ep(priv_dev, 0 | (dir ? USB_DIR_IN : USB_DIR_OUT));
>  	ep_sts_reg = readl(&regs->ep_sts);
>  
> +	dev_dbg(&priv_dev->dev, "%s\n", cdns3_decode_ep0_irq(priv_dev, dir));
[]
> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
[]
> @@ -537,6 +547,8 @@ static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep)
>  	cdns3_select_ep(priv_dev, priv_ep->endpoint.address);
>  	ep_sts_reg = readl(&regs->ep_sts);
>  
> +	dev_dbg(&priv_dev->dev, "%s\n", cdns3_decode_epx_irq(priv_ep));
>