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![Andy Shevchenko](/assets/img/avatar_default.png)
There is no need to pass constants via stack. The width may be explicitly specified in the format. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
335 lines
7.6 KiB
C
335 lines
7.6 KiB
C
/*
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* Copyright (C) 2012 Red Hat
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*
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* based in parts on udlfb.c:
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* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
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* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
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* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License v2. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <drm/drmP.h>
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#include "udl_drv.h"
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/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
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#define BULK_SIZE 512
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#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
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#define WRITES_IN_FLIGHT (4)
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#define MAX_VENDOR_DESCRIPTOR_SIZE 256
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#define GET_URB_TIMEOUT HZ
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#define FREE_URB_TIMEOUT (HZ*2)
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static int udl_parse_vendor_descriptor(struct drm_device *dev,
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struct usb_device *usbdev)
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{
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struct udl_device *udl = dev->dev_private;
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char *desc;
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char *buf;
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char *desc_end;
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u8 total_len = 0;
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buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
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if (!buf)
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return false;
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desc = buf;
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total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
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0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
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if (total_len > 5) {
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DRM_INFO("vendor descriptor length:%x data:%11ph\n",
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total_len, desc);
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if ((desc[0] != total_len) || /* descriptor length */
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(desc[1] != 0x5f) || /* vendor descriptor type */
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(desc[2] != 0x01) || /* version (2 bytes) */
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(desc[3] != 0x00) ||
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(desc[4] != total_len - 2)) /* length after type */
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goto unrecognized;
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desc_end = desc + total_len;
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desc += 5; /* the fixed header we've already parsed */
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while (desc < desc_end) {
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u8 length;
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u16 key;
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key = le16_to_cpu(*((u16 *) desc));
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desc += sizeof(u16);
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length = *desc;
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desc++;
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switch (key) {
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case 0x0200: { /* max_area */
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u32 max_area;
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max_area = le32_to_cpu(*((u32 *)desc));
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DRM_DEBUG("DL chip limited to %d pixel modes\n",
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max_area);
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udl->sku_pixel_limit = max_area;
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break;
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}
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default:
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break;
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}
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desc += length;
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}
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}
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goto success;
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unrecognized:
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/* allow udlfb to load for now even if firmware unrecognized */
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DRM_ERROR("Unrecognized vendor firmware descriptor\n");
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success:
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kfree(buf);
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return true;
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}
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static void udl_release_urb_work(struct work_struct *work)
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{
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struct urb_node *unode = container_of(work, struct urb_node,
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release_urb_work.work);
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up(&unode->dev->urbs.limit_sem);
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}
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void udl_urb_completion(struct urb *urb)
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{
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struct urb_node *unode = urb->context;
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struct udl_device *udl = unode->dev;
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unsigned long flags;
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/* sync/async unlink faults aren't errors */
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if (urb->status) {
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if (!(urb->status == -ENOENT ||
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urb->status == -ECONNRESET ||
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urb->status == -ESHUTDOWN)) {
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DRM_ERROR("%s - nonzero write bulk status received: %d\n",
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__func__, urb->status);
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atomic_set(&udl->lost_pixels, 1);
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}
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}
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urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
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spin_lock_irqsave(&udl->urbs.lock, flags);
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list_add_tail(&unode->entry, &udl->urbs.list);
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udl->urbs.available++;
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spin_unlock_irqrestore(&udl->urbs.lock, flags);
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#if 0
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/*
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* When using fb_defio, we deadlock if up() is called
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* while another is waiting. So queue to another process.
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*/
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if (fb_defio)
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schedule_delayed_work(&unode->release_urb_work, 0);
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else
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#endif
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up(&udl->urbs.limit_sem);
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}
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static void udl_free_urb_list(struct drm_device *dev)
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{
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struct udl_device *udl = dev->dev_private;
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int count = udl->urbs.count;
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struct list_head *node;
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struct urb_node *unode;
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struct urb *urb;
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int ret;
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unsigned long flags;
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DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
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/* keep waiting and freeing, until we've got 'em all */
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while (count--) {
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/* Getting interrupted means a leak, but ok at shutdown*/
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ret = down_interruptible(&udl->urbs.limit_sem);
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if (ret)
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break;
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spin_lock_irqsave(&udl->urbs.lock, flags);
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node = udl->urbs.list.next; /* have reserved one with sem */
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list_del_init(node);
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spin_unlock_irqrestore(&udl->urbs.lock, flags);
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unode = list_entry(node, struct urb_node, entry);
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urb = unode->urb;
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/* Free each separately allocated piece */
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usb_free_coherent(urb->dev, udl->urbs.size,
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urb->transfer_buffer, urb->transfer_dma);
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usb_free_urb(urb);
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kfree(node);
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}
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udl->urbs.count = 0;
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}
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static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
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{
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struct udl_device *udl = dev->dev_private;
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int i = 0;
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struct urb *urb;
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struct urb_node *unode;
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char *buf;
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spin_lock_init(&udl->urbs.lock);
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udl->urbs.size = size;
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INIT_LIST_HEAD(&udl->urbs.list);
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while (i < count) {
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unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
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if (!unode)
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break;
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unode->dev = udl;
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INIT_DELAYED_WORK(&unode->release_urb_work,
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udl_release_urb_work);
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urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!urb) {
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kfree(unode);
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break;
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}
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unode->urb = urb;
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buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
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&urb->transfer_dma);
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if (!buf) {
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kfree(unode);
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usb_free_urb(urb);
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break;
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}
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/* urb->transfer_buffer_length set to actual before submit */
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usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
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buf, size, udl_urb_completion, unode);
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urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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list_add_tail(&unode->entry, &udl->urbs.list);
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i++;
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}
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sema_init(&udl->urbs.limit_sem, i);
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udl->urbs.count = i;
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udl->urbs.available = i;
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DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
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return i;
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}
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struct urb *udl_get_urb(struct drm_device *dev)
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{
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struct udl_device *udl = dev->dev_private;
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int ret = 0;
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struct list_head *entry;
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struct urb_node *unode;
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struct urb *urb = NULL;
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unsigned long flags;
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/* Wait for an in-flight buffer to complete and get re-queued */
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ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
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if (ret) {
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atomic_set(&udl->lost_pixels, 1);
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DRM_INFO("wait for urb interrupted: %x available: %d\n",
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ret, udl->urbs.available);
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goto error;
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}
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spin_lock_irqsave(&udl->urbs.lock, flags);
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BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
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entry = udl->urbs.list.next;
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list_del_init(entry);
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udl->urbs.available--;
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spin_unlock_irqrestore(&udl->urbs.lock, flags);
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unode = list_entry(entry, struct urb_node, entry);
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urb = unode->urb;
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error:
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return urb;
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}
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int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
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{
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struct udl_device *udl = dev->dev_private;
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int ret;
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BUG_ON(len > udl->urbs.size);
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urb->transfer_buffer_length = len; /* set to actual payload len */
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ret = usb_submit_urb(urb, GFP_ATOMIC);
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if (ret) {
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udl_urb_completion(urb); /* because no one else will */
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atomic_set(&udl->lost_pixels, 1);
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DRM_ERROR("usb_submit_urb error %x\n", ret);
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}
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return ret;
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}
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int udl_driver_load(struct drm_device *dev, unsigned long flags)
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{
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struct udl_device *udl;
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int ret;
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DRM_DEBUG("\n");
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udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
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if (!udl)
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return -ENOMEM;
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udl->ddev = dev;
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dev->dev_private = udl;
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if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
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DRM_ERROR("firmware not recognized. Assume incompatible device\n");
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goto err;
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}
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if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
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ret = -ENOMEM;
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DRM_ERROR("udl_alloc_urb_list failed\n");
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goto err;
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}
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DRM_DEBUG("\n");
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ret = udl_modeset_init(dev);
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ret = udl_fbdev_init(dev);
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return 0;
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err:
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kfree(udl);
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DRM_ERROR("%d\n", ret);
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return ret;
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}
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int udl_drop_usb(struct drm_device *dev)
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{
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udl_free_urb_list(dev);
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return 0;
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}
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int udl_driver_unload(struct drm_device *dev)
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{
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struct udl_device *udl = dev->dev_private;
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if (udl->urbs.count)
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udl_free_urb_list(dev);
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udl_fbdev_cleanup(dev);
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udl_modeset_cleanup(dev);
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kfree(udl);
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return 0;
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}
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