On Wed, Jul 20, 2011 at 10:41 AM, Vikram Pandita <vikram.pandita@xxxxxx> wrote:
> From: Anand Gadiyar <gadiyar@xxxxxx>
>
> This patch enables the DMA mode1 RX support.
> This feature is enabled based on the short_not_ok flag passed from
> gadget drivers.
>
> This will result in a thruput performance gain of around
> 40% for USB mass-storage/mtp use cases.
>
> Signed-off-by: Anand Gadiyar <gadiyar@xxxxxx>
> Signed-off-by: Moiz Sonasath <m-sonasath@xxxxxx>
> Signed-off-by: Vikram Pandita <vikram.pandita@xxxxxx>
> Tested-by: Vikram Pandita <vikram.pandita@xxxxxx>
> ---
> v1 - initial push
> v2 - fixed whitespace issues as per Sergei Shtylyov<sshtylyov@xxxxxxxxxx> comments
> v3 - restor authorship to Anand Gadiyar <gadiyar@xxxxxx>
> v4 - adding my signed-off as per Kevin Hilman <khilman@xxxxxx>
>
> drivers/usb/musb/musb_gadget.c | 68 ++++++++++++++++++++++++---------------
> 1 files changed, 42 insertions(+), 26 deletions(-)
> @@ -683,6 +684,18 @@ static void rxstate(struct musb *musb, struct musb_request *req)
>
> if (csr & MUSB_RXCSR_RXPKTRDY) {
> len = musb_readw(epio, MUSB_RXCOUNT);
> +
> + /*
> + * Enable Mode 1 for RX transfers only for mass-storage
> + * use-case, based on short_not_ok flag which is set only
> + * from file_storage and f_mass_storage drivers
> + */
> +
> + if (request->short_not_ok && len == musb_ep->packet_sz)
> + use_mode_1 = 1;
> + else
> + use_mode_1 = 0;
> +
There is nothing UMS class specific in this patch...
(request->short_not_ok && len == musb_ep->packet_sz) may not be the
signature of, and only of, Mass Storage Functions. So maybe removing
the UMS mention from
comment and change-log is a good idea.
You might want to add is-ep-type-bulk-out check to the condition
though, so that it doesn't affect
cases that you didn't verify.
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