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drm/udl: Ensure channel is selected before using the device. 

Lift configuration command from udlfb. This appears to be essential for
at least a Rextron VCUD-60, without which no URB communication occurs.

Signed-off-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1471904254-26545-1-git-send-email-jm@lentin.co.uk
This commit is contained in:
Jamie Lentin 2016-08-22 23:17:34 +01:00 committed by Daniel Vetter
parent b4ba97e767
commit d1c151dcae
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/udl/udl_main.c
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@ -16,6 +16,8 @@
/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE 512
#define NR_USB_REQUEST_CHANNEL 0x12
#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
#define WRITES_IN_FLIGHT (4)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256
@ -90,6 +92,26 @@ success:
return true;
}
/*
* Need to ensure a channel is selected before submitting URBs
*/
static int udl_select_std_channel(struct udl_device *udl)
{
int ret;
u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
0x1C, 0x88, 0x5E, 0x15,
0x60, 0xFE, 0xC6, 0x97,
0x16, 0x3D, 0x47, 0xF2};
ret = usb_control_msg(udl->udev,
usb_sndctrlpipe(udl->udev, 0),
NR_USB_REQUEST_CHANNEL,
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
set_def_chn, sizeof(set_def_chn),
USB_CTRL_SET_TIMEOUT);
return ret < 0 ? ret : 0;
}
static void udl_release_urb_work(struct work_struct *work)
{
struct urb_node *unode = container_of(work, struct urb_node,
@ -301,6 +323,9 @@ int udl_driver_load(struct drm_device *dev, unsigned long flags)
goto err;
}
if (udl_select_std_channel(udl))
DRM_ERROR("Selecting channel failed\n");
if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
DRM_ERROR("udl_alloc_urb_list failed\n");
goto err;