Hi Paul,
On Tue, May 06, 2014 at 11:54:19AM +0800, Pratyush ANAND wrote:
> All dwc3 based xhci host controller supports USB3.0 LPM functionality.
> Therefore enable it in platform data for all dwc3 based xhci device.
>
> Signed-off-by: Pratyush Anand <pratyush.an...@st.com>
> ---
> drivers/usb/dwc3/host.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index 32db328..1fda6e8 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -16,12 +16,14 @@
> */
>
> #include <linux/platform_device.h>
> +#include <linux/usb/xhci_pdriver.h>
>
> #include "core.h"
>
> int dwc3_host_init(struct dwc3 *dwc)
> {
> struct platform_device *xhci;
> + struct usb_xhci_pdata pdata;
> int ret;
>
> xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
> @@ -46,6 +48,16 @@ int dwc3_host_init(struct dwc3 *dwc)
> goto err1;
> }
>
> + memset(&pdata, 0, sizeof(pdata));
> +
> + pdata.usb3_lpm_capable = 1;
Even though all dwc3 platform is usb3 lpm capable, I would like to
make it optional, as I see some performance impact when capability is
enabled vs not enabled.
When enabled:
./testusb -a -t 2 -c 1000000 -s 1024
takes 198 sec to execute
vs when not enabled , it takes 169 sec to execute.
And this impact is with a gadget with maxburst and mult as 0.
Performance will be impacted more with higher maxburst and mult.
So making it optional would be a better choice. What do you say.
Pratyush
> +
> + ret = platform_device_add_data(xhci, &pdata, sizeof(pdata));
> + if (ret) {
> + dev_err(dwc->dev, "couldn't add platform data to xHCI
> device\n");
> + goto err1;
> + }
> +
> ret = platform_device_add(xhci);
> if (ret) {
> dev_err(dwc->dev, "failed to register xHCI device\n");
> --
> 1.8.1.2
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