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Commit aaac570a authored by Sriharsha Allenki's avatar Sriharsha Allenki Committed by Gerrit - the friendly Code Review server
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usb: gadget: Add support for fifo resize of user specified IN endpoint 



Add support for high bandwidth transfer on Isochronous IN
endpoint by allowing fifo_resize on a particular endpoint using
high_bw_ep_in_num module parameter.
To enable fifo resize so as to support high bandwidth transfers
on Isoc IN endpoint:
1. echo 0 > /sys/class/android_usb/android0/enable
2. echo <ep_num> > /sys/module/dwc3/parameters/high_bw_ep_in_num
3. echo 1 > /sys/class/android_usb/android0/enable

CRs-fixed: 2043149
Change-Id: I2bae02cb5e33ccd15622acf4a4e160452b670d96
Signed-off-by: default avatarSriharsha Allenki <sallenki@codeaurora.org>
parent 9e0838c6

drivers/usb/dwc3/gadget.c

+15 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/spinlock.h>
@@ -41,6 +43,16 @@ 
static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, bool remote_wakeup);

static int dwc3_gadget_wakeup_int(struct dwc3 *dwc);



/*

 * Some USB functions' endpoints are not enabled at set config stage.

 * So fifo_resize cannot happen for these endpoints.

 * So, user can specify Isochronous IN endpoint using high_bw_ep_in_num

 * to enable fifo_resize to support high bandwidth transfers.

 */

static int high_bw_ep_in_num;

module_param(high_bw_ep_in_num, int, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(high_bw_ep_in_num,

		"Isoc ep number to support for HS high bandwidth transfer");

/**

 * dwc3_gadget_set_test_mode - Enables USB2 Test Modes

 * @dwc: pointer to our context structure
@@ -216,6 +228,9 @@ int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc) 
				dep->endpoint.endless)

			mult = 3;



		if (num == high_bw_ep_in_num)

			mult = 3;



		if (!(dep->flags & DWC3_EP_ENABLED)) {

			dev_dbg(dwc->dev, "ep%dIn not enabled", num);

			goto resize_fifo;