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udlfb: Add module_param to allow forcing pixel_limit

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Some user scenarios need to prioritize performance over
maxiumum resolution.

Also, some devices may have bad vendor descriptors, and
this allows the user to set a pixel limit that matches
their specific device to avoid blank screens on higher
resolution monitors.

700000 minimum for DL-115, 2360000 maximum for DL-195

Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Signed-off-by: Bernie Thompson <bernie@plugable.com>
This commit is contained in:
Ben Collins 2012-03-03 12:57:37 -08:00 committed by Bernie Thompson
parent b49f184b64
commit 664c5f1849
1 changed files with 12 additions and 0 deletions
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12
drivers/video/udlfb.c
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@ -72,6 +72,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
static bool console = 1; /* Allow fbcon to open framebuffer */
static bool fb_defio = 1; /* Detect mmap writes using page faults */
static bool shadow = 1; /* Optionally disable shadow framebuffer */
static int pixel_limit; /* Optionally force a pixel resolution limit */
/* dlfb keeps a list of urbs for efficient bulk transfers */
static void dlfb_urb_completion(struct urb *urb);
@ -1616,6 +1617,14 @@ static int dlfb_usb_probe(struct usb_interface *interface,
goto error;
}
if (pixel_limit) {
pr_warn("DL chip limit of %d overriden"
" by module param to %d\n",
dev->sku_pixel_limit, pixel_limit);
dev->sku_pixel_limit = pixel_limit;
}
if (!dlfb_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
retval = -ENOMEM;
pr_err("dlfb_alloc_urb_list failed\n");
@ -1963,6 +1972,9 @@ MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");
module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf");
module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)");
MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "
"Jaya Kumar <jayakumar.lkml@gmail.com>, "
"Bernie Thompson <bernie@plugable.com>");