linux-kernel - Re: [PATCH 12/12] USB: ehci-omap: Fix detection in HSIC mode

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Date:	Tue, 12 Mar 2013 16:21:07 +0530
From:	kishon <kishon@...com>
To:	Roger Quadros <rogerq@...com>
CC:	<gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
	<balbi@...com>, <b-cousson@...com>, <mark.rutland@....com>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 12/12] USB: ehci-omap: Fix detection in HSIC mode

Hi,

On Tuesday 12 March 2013 04:14 PM, Roger Quadros wrote:
> The HSIC devices need to be kept in reset while the EHCI controller
> is being initialized and only brought out of reset after the
> initialization is complete, else HSIC devices will not be detected.
>
> Signed-off-by: Roger Quadros <rogerq@...com>
> CC: Alan Stern <stern@...land.harvard.edu>
> ---
>   drivers/usb/host/ehci-omap.c |   28 +++++++++++-----------------
>   1 files changed, 11 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
> index 1ba1df8..52a2d46 100644
> --- a/drivers/usb/host/ehci-omap.c
> +++ b/drivers/usb/host/ehci-omap.c
> @@ -50,6 +50,7 @@
>   #include <linux/usb/hcd.h>
>   #include <linux/of.h>
>   #include <linux/dma-mapping.h>
> +#include <linux/delay.h>

not needed here I guess.
>
>   #include "ehci.h"
>
> @@ -90,26 +91,13 @@ static inline u32 ehci_read(void __iomem *base, u32 reg)
>   static int omap_ehci_init(struct usb_hcd *hcd)
>   {
>   	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
> -	struct omap_hcd	*omap = (struct omap_hcd *)ehci->priv;
> -	int rc, i;
> -
> -	/* Hold PHYs in reset while initializing EHCI controller */
> -	for (i = 0; i < omap->nports; i++) {
> -		if (omap->phy[i])
> -			usb_phy_shutdown(omap->phy[i]);
> -	}
> +	int rc;
>
>   	/* we know this is the memory we want, no need to ioremap again */
>   	ehci->caps = hcd->regs;
>
>   	rc = ehci_setup(hcd);
>
> -	/* Bring PHYs out of reset */
> -	for (i = 0; i < omap->nports; i++) {
> -		if (omap->phy[i])
> -			usb_phy_init(omap->phy[i]);
> -	}
> -
>   	return rc;
>   }
>
> @@ -219,9 +207,6 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
>   		}
>
>   		omap->phy[i] = phy;
> -		usb_phy_init(omap->phy[i]);
> -		/* bring PHY out of suspend */
> -		usb_phy_set_suspend(omap->phy[i], 0);
>   	}
>
>   	pm_runtime_enable(dev);
> @@ -245,6 +230,15 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
>   		goto err_pm_runtime;
>   	}
>
> +	/* Bring PHYs out of reset */
> +	for (i = 0; i < omap->nports; i++) {
> +		if (!omap->phy[i])
> +			continue;
> +
> +		usb_phy_init(omap->phy[i]);
> +		/* bring PHY out of suspend */
> +		usb_phy_set_suspend(omap->phy[i], 0);
> +	}

But isn't HSIC supposed to be PHYless devices. Maybe a comment 
explaining it might be helpful.

Thanks
Kishon
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