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Commit 2e6c72b6 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: gadget: mass_storage: allow for deeper queue lengths 



Instead of allowing a range of 2 to 4 requests,
let's allow the user choose up to 32 requests
as that will give us a better chance of keeping
controller busy.

We still maintain default of 2 so users shouldn't
be affected.

Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent a8f32817

drivers/usb/gadget/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -113,7 +113,7 @@ config USB_GADGET_VBUS_DRAW 


config USB_GADGET_STORAGE_NUM_BUFFERS

	int "Number of storage pipeline buffers"

	range 2 4

	range 2 32

	default 2

	help

	   Usually 2 buffers are enough to establish a good buffering

drivers/usb/gadget/function/f_mass_storage.c

+4 −2
Original line number Diff line number Diff line
@@ -2662,10 +2662,12 @@ EXPORT_SYMBOL_GPL(fsg_common_put); 
/* check if fsg_num_buffers is within a valid range */

static inline int fsg_num_buffers_validate(unsigned int fsg_num_buffers)

{

	if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4)

#define FSG_MAX_NUM_BUFFERS	32



	if (fsg_num_buffers >= 2 && fsg_num_buffers <= FSG_MAX_NUM_BUFFERS)

		return 0;

	pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",

	       fsg_num_buffers, 2, 4);

	       fsg_num_buffers, 2, FSG_MAX_NUM_BUFFERS);

	return -EINVAL;

}