linux-kernel - Re: [PATCH v4 3/6] phy: cadence: salvo: add bist fix

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Date:   Tue, 16 May 2023 22:04:04 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     devicetree@...r.kernel.org, fushi.peng@....com,
        imx@...ts.linux.dev, kernel@...gutronix.de, kishon@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, robh+dt@...nel.org,
        s.hauer@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH v4 3/6] phy: cadence: salvo: add bist fix

On 16-05-23, 11:43, Frank Li wrote:
> From: Peter Chen <peter.chen@....com>
> 
> Very limited parts may fail to work on full speed mode (both host and
> device modes) for USB3 port due to higher threshold in full speed receiver
> of USB2.0 PHY.
> 
> One example failure symptom is, the enumeration is failed when connecting
> full speed USB mouse to USB3 port, especially under high temperature.
> 
> The workaround is to configure threshold voltage value of single ended
> receiver by setting USB2.0 PHY register AFE_RX_REG5[2:0] to 3'b101.
> 
> Signed-off-by: Peter Chen <peter.chen@....com>

This needs senders S-o-b as well!

> ---
>  drivers/phy/cadence/phy-cadence-salvo.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/phy/cadence/phy-cadence-salvo.c b/drivers/phy/cadence/phy-cadence-salvo.c
> index 2e3d4d8fb8eb..b9866dc146ce 100644
> --- a/drivers/phy/cadence/phy-cadence-salvo.c
> +++ b/drivers/phy/cadence/phy-cadence-salvo.c
> @@ -91,6 +91,7 @@
>  
>  /* USB2 PHY register definition */
>  #define UTMI_REG15				0xaf
> +#define UTMI_AFE_RX_REG5			0x12
>  
>  /* TB_ADDR_TX_RCVDETSC_CTRL */
>  #define RXDET_IN_P3_32KHZ			BIT(0)
> @@ -247,6 +248,8 @@ static int cdns_salvo_phy_init(struct phy *phy)
>  	cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_REG15,
>  			 value | TXVALID_GATE_THRESHOLD_HS_0US);
>  
> +	cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG5,
> +			 0x5);

single line reads better

>  	udelay(10);
>  
>  	clk_disable_unprepare(salvo_phy->clk);
> -- 
> 2.34.1

-- 
~Vinod