linux-kernel - Re: [PATCH 1/2] usb: chipidea: add xilinx zynq platform data

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Message-ID: <CALHRZuqFtaRFNd9D=a+x2rZ2848ZOGYbTkSWCHxNPcW_NvocxA@mail.gmail.com>
Date:	Thu, 27 Aug 2015 10:59:22 +0530
From:	sundeep subbaraya <sundeep.lkml@...il.com>
To:	Nathan Sullivan <nathan.sullivan@...com>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Cc:	Peter.Chen@...escale.com, robh+dt@...nel.org, pawel.moll@....com,
	Mark Rutland <mark.rutland@....com>,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 1/2] usb: chipidea: add xilinx zynq platform data

Hi,


On Wed, Aug 26, 2015 at 8:57 PM, Nathan Sullivan <nathan.sullivan@...com> wrote:
> The Xilinx Zynq udc does not need the CI_HDRC_DISABLE_STREAMING flag,
> unlike the default platform data.  Add platform data specific to the
> Zynq udc.
>
> Based on a patch by the same name from the Xilinx vendor tree.

I am that Xilinx guy who sent this patch :). It is in Xilinx tree as
temporary fix and
I did not debug further why UDC works only when streaming is enabled.
Probably this is right time to post my question here.
I was expecting like:
Streaming disabled - both low bandwidth and high bandwidth systems
should work fine
Streaming enabled - only for high bandwidth systems
but this is not the case, Zynq UDC works only when Streaming is enabled.
Please correct me if I am wrong.

Thanks,
Sundeep

>
> Signed-off-by: Nathan Sullivan <nathan.sullivan@...com>
> ---
>  drivers/usb/chipidea/ci_hdrc_usb2.c |   25 +++++++++++++++++++------
>  1 file changed, 19 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
> index 9eae1a1..4456d2c 100644
> --- a/drivers/usb/chipidea/ci_hdrc_usb2.c
> +++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
> @@ -12,6 +12,7 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_platform.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/usb/chipidea.h>
> @@ -30,18 +31,36 @@ static const struct ci_hdrc_platform_data ci_default_pdata = {
>         .flags          = CI_HDRC_DISABLE_STREAMING,
>  };
>
> +static struct ci_hdrc_platform_data ci_zynq_pdata = {
> +       .capoffset      = DEF_CAPOFFSET,
> +};
> +
> +static const struct of_device_id ci_hdrc_usb2_of_match[] = {
> +       { .compatible = "chipidea,usb2"},
> +       { .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata},
> +       { }
> +};
> +MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
> +
>  static int ci_hdrc_usb2_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
>         struct ci_hdrc_usb2_priv *priv;
>         struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
>         int ret;
> +       const struct of_device_id *match;
>
>         if (!ci_pdata) {
>                 ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
>                 *ci_pdata = ci_default_pdata;   /* struct copy */
>         }
>
> +       match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
> +       if (match && match->data) {
> +               /* struct copy */
> +               *ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
> +       }
> +
>         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>         if (!priv)
>                 return -ENOMEM;
> @@ -96,12 +115,6 @@ static int ci_hdrc_usb2_remove(struct platform_device *pdev)
>         return 0;
>  }
>
> -static const struct of_device_id ci_hdrc_usb2_of_match[] = {
> -       { .compatible = "chipidea,usb2" },
> -       { }
> -};
> -MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
> -
>  static struct platform_driver ci_hdrc_usb2_driver = {
>         .probe  = ci_hdrc_usb2_probe,
>         .remove = ci_hdrc_usb2_remove,
> --
> 1.7.10.4
>
> --
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