Den 05.03.2021 17.31, skrev Noralf Trønnes:
> This adds a USB display driver with the intention that it can be
> used with future USB interfaced low end displays/adapters. The Linux
> gadget device driver will serve as the canonical device implementation.
>
> diff --git a/drivers/gpu/drm/gud/gud_drv.c b/drivers/gpu/drm/gud/gud_drv.c
> +static int gud_probe(struct usb_interface *intf, const struct usb_device_id
> *id)
> +{
> + num_formats_dev = ret;
> + for (i = 0; i < num_formats_dev; i++) {
> + const struct drm_format_info *info;
> + size_t fmt_buf_size;
> + u32 format;
> +
> + format = gud_to_fourcc(formats_dev[i]);
> + if (!format) {
> + drm_dbg(drm, "Unsupported format: 0x%02x\n",
> formats_dev[i]);
> + continue;
> + }
> +
> + if (format == GUD_DRM_FORMAT_R1)
> + info = &gud_drm_format_r1;
> + else if (format == GUD_DRM_FORMAT_RGB111)
> + info = &gud_drm_format_rgb111;
> + else
> + info = drm_format_info(format);
> +
> + switch (format) {
> + case GUD_DRM_FORMAT_R1:
> + fallthrough;
> + case GUD_DRM_FORMAT_RGB111:
> + xrgb8888_emulation_format = info;
> + break;
> + case DRM_FORMAT_RGB565:
> + rgb565_supported = true;
> + if (!xrgb8888_emulation_format)
> + xrgb8888_emulation_format = info;
> + break;
> + case DRM_FORMAT_XRGB8888:
> + xrgb8888_supported = true;
> + break;
> + };
> +
> + fmt_buf_size = drm_format_info_min_pitch(info, 0,
> drm->mode_config.max_width) *
> + drm->mode_config.max_height;
> + max_buffer_size = max(max_buffer_size, fmt_buf_size);
> +
> + if (format == GUD_DRM_FORMAT_R1)
This line should be:
if (format == GUD_DRM_FORMAT_R1 || format ==
GUD_DRM_FORMAT_RGB111)
There's also a bug in the format conversion functions that shows up on
transfers with widths that are not pixels per byte aligned. I've fixed
R1, I'll look at RGB111 tomorrow.
Noralf.
> + continue; /* Internal not for userspace */
> +
> + formats[num_formats++] = format;
> + }
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