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From: Peter Chen <peter.chen@nxp.com>
To: Pawel Laszczak <pawell@cadence.com>
Cc: "felipe.balbi@linux.intel.com" <felipe.balbi@linux.intel.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	"rogerq@ti.com" <rogerq@ti.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"jbergsagel@ti.com" <jbergsagel@ti.com>,
	"nsekhar@ti.com" <nsekhar@ti.com>, "nm@ti.com" <nm@ti.com>,
	"sureshp@cadence.com" <sureshp@cadence.com>,
	"kurahul@cadence.com" <kurahul@cadence.com>
Subject: Re: [PATCH] usb: cdns3: Fix for incorrect DMA mask.
Date: Tue, 8 Oct 2019 08:03:39 +0000
Message-ID: <20191008080320.GG5670@b29397-desktop> (raw)
In-Reply-To: <1570449803-15299-1-git-send-email-pawell@cadence.com>

On 19-10-07 13:03:23, Pawel Laszczak wrote:
> This patch restores the correct DMA mask after switching back to device
> mode.
> The issue occurred because Device part of controller use 32 bits DMA and
> Host side use 64 bits DMA. During loading XHCI driver the DMA mask
> used by driver is overwritten by XHCI driver so it must be restored
> to 32 bits.
> 
> Reported-by: Pawel Laszczak <pawell@cadence.com>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
> ---
>  drivers/usb/cdns3/gadget.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
> index 157536753b8c..2ca280f4c054 100644
> --- a/drivers/usb/cdns3/gadget.c
> +++ b/drivers/usb/cdns3/gadget.c
> @@ -2663,6 +2663,13 @@ static int __cdns3_gadget_init(struct cdns3 *cdns)
>  {
>  	int ret = 0;
>  
> +	/* Ensure 32-bit DMA Mask in case we switched back from Host mode */
> +	ret = dma_set_mask_and_coherent(cdns->dev, DMA_BIT_MASK(32));
> +	if (ret) {
> +		dev_err(cdns->dev, "Failed to set dma mask: %d\n", ret);
> +		return ret;
> +	}
> +
>  	cdns3_drd_switch_gadget(cdns, 1);
>  	pm_runtime_get_sync(cdns->dev);
>  

Reviewed-by: Peter Chen <peter.chen@nxp.com>

-- 

Thanks,
Peter Chen

      parent reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-07 12:03 Pawel Laszczak
2019-10-07 12:20 ` Roger Quadros
2019-10-08  8:03 ` Peter Chen [this message]

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