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drm/fb-helper: Fix single-probe color-format selection
Fix the color-format selection of the single-probe helper. Go through all user-specified values and test each for compatibility with the driver. If none is supported, use the driver-provided default. This guarantees that the console is always available in any color format at least. Until now, the format selection of the single-probe helper tried to either use a user-specified format or a 32-bit default format. If the user-specified format was not supported by the driver, the selection failed and the display remained blank. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230102112927.26565-12-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
parent
cff84bac99
commit
37c90d589d
1 changed files with 95 additions and 79 deletions
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@ -1726,6 +1726,70 @@ int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
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}
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EXPORT_SYMBOL(drm_fb_helper_pan_display);
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static uint32_t drm_fb_helper_find_format(struct drm_fb_helper *fb_helper, const uint32_t *formats,
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size_t format_count, uint32_t bpp, uint32_t depth)
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{
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struct drm_device *dev = fb_helper->dev;
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uint32_t format;
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size_t i;
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/*
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* Do not consider YUV or other complicated formats
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* for framebuffers. This means only legacy formats
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* are supported (fmt->depth is a legacy field), but
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* the framebuffer emulation can only deal with such
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* formats, specifically RGB/BGA formats.
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*/
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format = drm_mode_legacy_fb_format(bpp, depth);
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if (!format)
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goto err;
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for (i = 0; i < format_count; ++i) {
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if (formats[i] == format)
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return format;
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}
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err:
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/* We found nothing. */
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drm_warn(dev, "bpp/depth value of %u/%u not supported\n", bpp, depth);
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return DRM_FORMAT_INVALID;
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}
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static uint32_t drm_fb_helper_find_cmdline_format(struct drm_fb_helper *fb_helper,
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const uint32_t *formats, size_t format_count,
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const struct drm_cmdline_mode *cmdline_mode)
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{
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struct drm_device *dev = fb_helper->dev;
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uint32_t bpp, depth;
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if (!cmdline_mode->bpp_specified)
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return DRM_FORMAT_INVALID;
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switch (cmdline_mode->bpp) {
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case 1:
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case 2:
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case 4:
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case 8:
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case 16:
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case 24:
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bpp = depth = cmdline_mode->bpp;
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break;
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case 15:
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bpp = 16;
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depth = 15;
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break;
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case 32:
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bpp = 32;
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depth = 24;
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break;
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default:
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drm_info(dev, "unsupported bpp value of %d\n", cmdline_mode->bpp);
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return DRM_FORMAT_INVALID;
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}
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return drm_fb_helper_find_format(fb_helper, formats, format_count, bpp, depth);
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}
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static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, int preferred_bpp,
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struct drm_fb_helper_surface_size *sizes)
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@ -1736,100 +1800,52 @@ static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, int prefe
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struct drm_connector_list_iter conn_iter;
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struct drm_connector *connector;
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struct drm_mode_set *mode_set;
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int best_depth = 0;
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uint32_t surface_format = DRM_FORMAT_INVALID;
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const struct drm_format_info *info;
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memset(sizes, 0, sizeof(struct drm_fb_helper_surface_size));
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sizes->surface_depth = 24;
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sizes->surface_bpp = 32;
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memset(sizes, 0, sizeof(*sizes));
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sizes->fb_width = (u32)-1;
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sizes->fb_height = (u32)-1;
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/*
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* If driver picks 8 or 16 by default use that for both depth/bpp
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* to begin with
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*/
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if (preferred_bpp != sizes->surface_bpp)
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sizes->surface_depth = sizes->surface_bpp = preferred_bpp;
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drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
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drm_client_for_each_connector_iter(connector, &conn_iter) {
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struct drm_cmdline_mode *cmdline_mode;
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cmdline_mode = &connector->cmdline_mode;
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if (cmdline_mode->bpp_specified) {
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switch (cmdline_mode->bpp) {
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case 8:
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sizes->surface_depth = sizes->surface_bpp = 8;
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break;
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case 15:
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sizes->surface_depth = 15;
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sizes->surface_bpp = 16;
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break;
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case 16:
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sizes->surface_depth = sizes->surface_bpp = 16;
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break;
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case 24:
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sizes->surface_depth = sizes->surface_bpp = 24;
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break;
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case 32:
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sizes->surface_depth = 24;
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sizes->surface_bpp = 32;
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break;
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}
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break;
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}
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}
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drm_connector_list_iter_end(&conn_iter);
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/*
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* If we run into a situation where, for example, the primary plane
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* supports RGBA5551 (16 bpp, depth 15) but not RGB565 (16 bpp, depth
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* 16) we need to scale down the depth of the sizes we request.
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*/
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drm_client_for_each_modeset(mode_set, client) {
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struct drm_crtc *crtc = mode_set->crtc;
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struct drm_plane *plane = crtc->primary;
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int j;
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drm_dbg_kms(dev, "test CRTC %u primary plane\n", drm_crtc_index(crtc));
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for (j = 0; j < plane->format_count; j++) {
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const struct drm_format_info *fmt;
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drm_connector_list_iter_begin(fb_helper->dev, &conn_iter);
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drm_client_for_each_connector_iter(connector, &conn_iter) {
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struct drm_cmdline_mode *cmdline_mode = &connector->cmdline_mode;
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fmt = drm_format_info(plane->format_types[j]);
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/*
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* Do not consider YUV or other complicated formats
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* for framebuffers. This means only legacy formats
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* are supported (fmt->depth is a legacy field) but
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* the framebuffer emulation can only deal with such
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* formats, specifically RGB/BGA formats.
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*/
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if (fmt->depth == 0)
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continue;
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/* We found a perfect fit, great */
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if (fmt->depth == sizes->surface_depth) {
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best_depth = fmt->depth;
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break;
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}
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/* Skip depths above what we're looking for */
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if (fmt->depth > sizes->surface_depth)
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continue;
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/* Best depth found so far */
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if (fmt->depth > best_depth)
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best_depth = fmt->depth;
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surface_format = drm_fb_helper_find_cmdline_format(fb_helper,
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plane->format_types,
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plane->format_count,
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cmdline_mode);
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if (surface_format != DRM_FORMAT_INVALID)
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break; /* found supported format */
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}
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drm_connector_list_iter_end(&conn_iter);
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if (surface_format != DRM_FORMAT_INVALID)
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break; /* found supported format */
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/* try preferred bpp/depth */
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surface_format = drm_fb_helper_find_format(fb_helper, plane->format_types,
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plane->format_count, preferred_bpp,
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dev->mode_config.preferred_depth);
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if (surface_format != DRM_FORMAT_INVALID)
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break; /* found supported format */
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}
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if (sizes->surface_depth != best_depth && best_depth) {
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drm_info(dev, "requested bpp %d, scaled depth down to %d",
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sizes->surface_bpp, best_depth);
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sizes->surface_depth = best_depth;
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if (surface_format == DRM_FORMAT_INVALID) {
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drm_warn(dev, "No compatible format found\n");
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return -EAGAIN;
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}
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info = drm_format_info(surface_format);
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sizes->surface_bpp = drm_format_info_bpp(info, 0);
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sizes->surface_depth = info->depth;
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/* first up get a count of crtcs now in use and new min/maxes width/heights */
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crtc_count = 0;
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drm_client_for_each_modeset(mode_set, client) {
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