Re: [PATCH 1/1] Revert "usb: chipidea: move ci_ulpi_init after the phy initialization"

[Luca Weiss <luca@z3ntu.xyz>]

On Freitag, 17. Mai 2024 04:36:48 MESZ Peter Chen wrote:
> This reverts commit 22ffd399e6e7aa18ae0314278ed0b7f05f8ab679.
> People report this commit causes the driver defer probed, and never
> back to work[1][2].
> 
> [1] https://lore.kernel.org/lkml/20240407011913.GA168730@nchen-desktop/T/#mc2b93bc11a8b01ec7cd0d0bf6b0b03951d9ef751
> [2] https://lore.kernel.org/lkml/20240407011913.GA168730@nchen-desktop/T/#me87d9a2a76c07619d83b3879ea14780da89fbbbf
> 

Hi all,

the original commit appears to break USB on Qualcomm msm8974 also (and
probably other platforms), as reported in
https://lore.kernel.org/all/87546d93-3fe7-4459-b44a-47cbcab9da74@me.ssier.org/

Could this get picked up?

Regards
Luca


> Cc: Michael Grzeschik <m.grzeschik@pengutronix.de>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Wouter Franken <wouter@franken-peeters.be>
> Signed-off-by: Peter Chen <peter.chen@kernel.org>
> ---
>  drivers/usb/chipidea/core.c | 8 ++++----
>  drivers/usb/chipidea/ulpi.c | 5 +++++
>  2 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index bada13f704b6..835bf2428dc6 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -1084,6 +1084,10 @@ static int ci_hdrc_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> +	ret = ci_ulpi_init(ci);
> +	if (ret)
> +		return ret;
> +
>  	if (ci->platdata->phy) {
>  		ci->phy = ci->platdata->phy;
>  	} else if (ci->platdata->usb_phy) {
> @@ -1138,10 +1142,6 @@ static int ci_hdrc_probe(struct platform_device *pdev)
>  		goto ulpi_exit;
>  	}
>  
> -	ret = ci_ulpi_init(ci);
> -	if (ret)
> -		return ret;
> -
>  	ci->hw_bank.phys = res->start;
>  
>  	ci->irq = platform_get_irq(pdev, 0);
> diff --git a/drivers/usb/chipidea/ulpi.c b/drivers/usb/chipidea/ulpi.c
> index 89fb51e2c3de..dfec07e8ae1d 100644
> --- a/drivers/usb/chipidea/ulpi.c
> +++ b/drivers/usb/chipidea/ulpi.c
> @@ -68,6 +68,11 @@ int ci_ulpi_init(struct ci_hdrc *ci)
>  	if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI)
>  		return 0;
>  
> +	/*
> +	 * Set PORTSC correctly so we can read/write ULPI registers for
> +	 * identification purposes
> +	 */
> +	hw_phymode_configure(ci);
>  
>  	ci->ulpi_ops.read = ci_ulpi_read;
>  	ci->ulpi_ops.write = ci_ulpi_write;
>