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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: Felipe Balbi <balbi@ti.com>
hifive-unleashed-5.1
Felipe Balbi 2015-09-15 09:39:45 -05:00
parent a8f32817ee
commit 2e6c72b61b
2 changed files with 5 additions and 3 deletions
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2
drivers/usb/gadget/Kconfig
View File

@ -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

6
drivers/usb/gadget/function/f_mass_storage.c
View File

@ -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;
}