linux-kernel - Re: [PATCH v1 1/1] phy: ti: tusb1210: Don't check for write errors when powering on

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Date:   Mon, 13 Jun 2022 22:40:55 +0200
From:   Ferry Toth <fntoth@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vinod Koul <vkoul@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Stephan Gerhold <stephan@...hold.net>,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v1 1/1] phy: ti: tusb1210: Don't check for write errors
 when powering on

Hi

Op 13-06-2022 om 18:08 schreef Andy Shevchenko:
> On some platforms, like Intel Merrifield, the writing values during power on
> may timeout:
>
>     tusb1210 dwc3.0.auto.ulpi: error -110 writing val 0x41 to reg 0x80
with the patch this error continues to appear in the logs
>     phy phy-dwc3.0.auto.ulpi.0: phy poweron failed --> -110
>     dwc3 dwc3.0.auto: error -ETIMEDOUT: failed to initialize core
>     dwc3: probe of dwc3.0.auto failed with error -110
these errors are gone
> which effectively fails the probe of the USB controller.

and probe of dwc3 succeeds

Tested on Intel Edison (Merrifield)

> Drop the check as it was before the culprit commit (see Fixes tag).
>
> Fixes: 09a3512681b3 ("phy: ti: tusb1210: Improve ulpi_read()/_write() error checking")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/phy/ti/phy-tusb1210.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/phy/ti/phy-tusb1210.c b/drivers/phy/ti/phy-tusb1210.c
> index c3ab4b69ea68..669c13d6e402 100644
> --- a/drivers/phy/ti/phy-tusb1210.c
> +++ b/drivers/phy/ti/phy-tusb1210.c
> @@ -105,8 +105,9 @@ static int tusb1210_power_on(struct phy *phy)
>   	msleep(TUSB1210_RESET_TIME_MS);
>   
>   	/* Restore the optional eye diagram optimization value */
> -	return tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2,
> -				   tusb->vendor_specific2);
> +	tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2, tusb->vendor_specific2);
> +
> +	return 0;
>   }
>   
>   static int tusb1210_power_off(struct phy *phy)