Hi Marek,
Here is my comments.
On Wednesday, March 30, 2011 4:01 PM Marek Szyprowski wrote:
>
> This patch adds generic frame buffer emulator for any video output device
> that uses videobuf2 framework. This emulator assumes that the driver is
> capable of working in single-buffering mode and use memory allocator that
> allows coherent memory mapping.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
> drivers/media/video/Kconfig | 7 +
> drivers/media/video/Makefile | 1 +
> drivers/media/video/videobuf2-fb.c | 565
> ++++++++++++++++++++++++++++++++++++
> include/media/videobuf2-fb.h | 22 ++
> 4 files changed, 595 insertions(+), 0 deletions(-) create mode 100644
<snip>
> +static struct fmt_desc fmt_conv_table[] = {
> + {
> + .fourcc = V4L2_PIX_FMT_RGB565,
> + .bits_per_pixel = 16,
> + .red = { .offset = 11, .length = 5, },
> + .green = { .offset = 5, .length = 6, },
> + .blue = { .offset = 0, .length = 5, },
> + }, {
> + .fourcc = V4L2_PIX_FMT_RGB555,
> + .bits_per_pixel = 16,
> + .red = { .offset = 11, .length = 5, },
> + .green = { .offset = 5, .length = 5, },
> + .blue = { .offset = 0, .length = 5, },
> + }, {
> + .fourcc = V4L2_PIX_FMT_RGB444,
> + .bits_per_pixel = 16,
> + .red = { .offset = 8, .length = 4, },
> + .green = { .offset = 4, .length = 4, },
> + .blue = { .offset = 0, .length = 4, },
> + .transp = { .offset = 12, .length = 4, },
> + }, {
> + .fourcc = V4L2_PIX_FMT_BGR32,
> + .bits_per_pixel = 32,
> + .red = { .offset = 16, .length = 4, },
red.length should be 8 in case of BGR32.
> + .green = { .offset = 8, .length = 8, },
> + .blue = { .offset = 0, .length = 8, },
> + .transp = { .offset = 24, .length = 8, },
> + },
> + /* TODO: add more format descriptors */ };
> +
> +/**
> + * vb2_drv_lock() - a shortcut to call driver specific lock()
> + * @q: videobuf2 queue
> + */
> +static inline void vb2_drv_lock(struct vb2_queue *q) {
> + q->ops->wait_finish(q);
> +}
> +
> +/**
> + * vb2_drv_unlock() - a shortcut to call driver specific unlock()
> + * @q: videobuf2 queue
> + */
> +static inline void vb2_drv_unlock(struct vb2_queue *q) {
> + q->ops->wait_prepare(q);
> +}
> +
> +/**
> + * vb2_fb_activate() - activate framebuffer emulator
> + * @info: framebuffer vb2 emulator data
> + * This function activates framebuffer emulator. The pixel format
> + * is acquired from video node, memory is allocated and framebuffer
> + * structures are filled with valid data.
> + */
> +static int vb2_fb_activate(struct fb_info *info) {
> + struct vb2_fb_data *data = info->par;
> + struct vb2_queue *q = data->q;
> + struct fb_var_screeninfo *var;
> + struct v4l2_format fmt;
> + struct fmt_desc *conv = NULL;
> + int width, height, fourcc, bpl, size;
> + int i, ret = 0;
> + int (*g_fmt)(struct file *file, void *fh, struct v4l2_format *f);
> +
> + /*
> + * Check if streaming api has not been already activated.
> + */
> + if (q->streaming || q->num_buffers > 0)
> + return -EBUSY;
> +
> + dprintk(3, "setting up framebuffer\n");
> +
> + /*
> + * Open video node.
> + */
> + ret = data->vfd->fops->open(&data->fake_file);
> + if (ret)
> + return ret;
> +
> + /*
> + * Get format from the video node.
> + */
> + memset(&fmt, 0, sizeof(fmt));
> + fmt.type = q->type;
> + if (data->vfd->ioctl_ops->vidioc_g_fmt_vid_out) {
> + g_fmt = data->vfd->ioctl_ops->vidioc_g_fmt_vid_out;
> + ret = g_fmt(&data->fake_file, data->fake_file.private_data,
> &fmt);
> + if (ret)
> + goto err;
> + width = fmt.fmt.pix.width;
> + height = fmt.fmt.pix.height;
> + fourcc = fmt.fmt.pix.pixelformat;
> + bpl = fmt.fmt.pix.bytesperline;
> + size = fmt.fmt.pix.sizeimage;
> + } else if (data->vfd->ioctl_ops->vidioc_g_fmt_vid_out_mplane) {
> + g_fmt = data->vfd->ioctl_ops->vidioc_g_fmt_vid_out_mplane;
> + ret = g_fmt(&data->fake_file, data->fake_file.private_data,
> &fmt);
> + if (ret)
> + goto err;
> + width = fmt.fmt.pix_mp.width;
> + height = fmt.fmt.pix_mp.height;
> + fourcc = fmt.fmt.pix_mp.pixelformat;
> + bpl = fmt.fmt.pix_mp.plane_fmt[0].bytesperline;
> + size = fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
> + } else {
> + ret = -EINVAL;
> + goto err;
> + }
> +
> + dprintk(3, "fb emu: width %d height %d fourcc %08x size %d bpl
%d\n",
> + width, height, fourcc, size, bpl);
> +
> + /*
> + * Find format mapping with fourcc returned by g_fmt().
> + */
> + for (i = 0; i < ARRAY_SIZE(fmt_conv_table); i++) {
> + if (fmt_conv_table[i].fourcc == fourcc) {
> + conv = &fmt_conv_table[i];
> + break;
> + }
> + }
> +
> + if (conv == NULL) {
> + ret = -EBUSY;
> + goto err;
> + }
> +
> + /*
> + * Request buffers and use MMAP type to force driver
> + * to allocate buffers by itself.
> + */
> + data->req.count = 1;
> + data->req.memory = V4L2_MEMORY_MMAP;
> + data->req.type = q->type;
> + ret = vb2_reqbufs(q, &data->req);
> + if (ret)
> + goto err;
> +
> + /*
> + * Check if plane_count is correct,
> + * multiplane buffers are not supported.
> + */
> + if (q->bufs[0]->num_planes != 1) {
> + data->req.count = 0;
> + ret = -EBUSY;
> + goto err;
> + }
> +
> + /*
> + * Get kernel address of the buffer.
> + */
> + data->vaddr = vb2_plane_vaddr(q->bufs[0], 0);
> + if (data->vaddr == NULL) {
> + ret = -EINVAL;
> + goto err;
> + }
> + data->size = size = vb2_plane_size(q->bufs[0], 0);
> +
> + /*
> + * Clear the buffer
> + */
> + memset(data->vaddr, 0, size);
> +
> + /*
> + * Setup framebuffer parameters
> + */
> + info->screen_base = data->vaddr;
> + info->screen_size = size;
> + info->fix.line_length = bpl;
> + info->fix.smem_len = info->fix.mmio_len = size;
> +
fix.smem_start is missed.
Some window systems use it.
> + var = &info->var;
> + var->xres = var->xres_virtual = var->width = width;
> + var->yres = var->yres_virtual = var->height = height;
> + var->bits_per_pixel = conv->bits_per_pixel;
> + var->red = conv->red;
> + var->green = conv->green;
> + var->blue = conv->blue;
> + var->transp = conv->transp;
> +
How about setting the fix.xpanstep and fix.ypanstep as 0 explicitly
if it doesn't support FBIOPAN_DISPLAY ?
> + return 0;
> +
> +err:
> + data->vfd->fops->release(&data->fake_file);
> + return ret;
> +}
> +
<snip>
> +static struct fb_ops vb2_fb_ops = {
> + .owner = THIS_MODULE,
> + .fb_open = vb2_fb_open,
> + .fb_release = vb2_fb_release,
> + .fb_mmap = vb2_fb_mmap,
> + .fb_blank = vb2_fb_blank,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> +};
> +
fb_ops.fb_check_var, fb_ops.fb_set_par might be added.
Will FBIO_WAITFORVSYNC be added with panning support ?
<snip>
> --
> 1.7.1.569.g6f426
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