linux-kernel - Re: [PATCH v5 6/6] phy: exynos5-usbdrd: support SS combo phy for ExynosAutov920

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Message-ID: <aKQfsgRXL-Nj8CkC@vaman>
Date: Tue, 19 Aug 2025 12:24:42 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Pritam Manohar Sutar <pritam.sutar@...sung.com>
Cc: kishon@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, alim.akhtar@...sung.com,
	andre.draszik@...aro.org, peter.griffin@...aro.org,
	kauschluss@...root.org, ivo.ivanov.ivanov1@...il.com,
	igor.belwon@...tallysanemainliners.org, m.szyprowski@...sung.com,
	s.nawrocki@...sung.com, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, rosa.pila@...sung.com,
	dev.tailor@...sung.com, faraz.ata@...sung.com,
	muhammed.ali@...sung.com, selvarasu.g@...sung.com
Subject: Re: [PATCH v5 6/6] phy: exynos5-usbdrd: support SS combo phy for
 ExynosAutov920

On 18-08-25, 13:11, Pritam Manohar Sutar wrote:

> > > +	/* check cr_para_ack*/
> > > +	cnt = 0;
> > > +	do {
> > > +		/*
> > > +		 * data symbols are captured by phy on rising edge of the
> > > +		 * tx_clk when tx data enabled.
> > > +		 * completion of the write cycle is acknowledged by
> assertion
> > > +		 * of the cr_para_ack.
> > > +		 */
> > > +		exynosautov920_usb31drd_cr_clk(phy_drd, true);
> > > +		reg = readl(reg_phy +
> > EXYNOSAUTOV920_USB31DRD_PHY_CR_PARA_CON0);
> > > +		if ((reg & PHY_CR_PARA_CON0_PHY0_CR_PARA_ACK))
> > > +			break;
> > > +
> > > +		exynosautov920_usb31drd_cr_clk(phy_drd, false);
> > > +
> > > +		/*
> > > +		 * wait for minimum of 10 cr_para_clk cycles after phy reset
> > > +		 * is negated, before accessing control regs to allow for
> > > +		 * internal resets.
> > > +		 */
> > > +		cnt++;
> > > +	} while (cnt < 10);
> > > +
> > > +	if (cnt == 10)
> > > +		dev_dbg(dev, "CR write failed to 0x%04x\n", addr);
> > 
> > Not error?
> 
> This is only for debugging purpose. It is not considered as error. 

Write failed is not an error? If this code is only for debug, pls drop
it. 

-- 
~Vinod