Hi Am 24.08.23 um 17:08 schrieb Geert Uytterhoeven:
drm_fb_helper_single_fb_probe() first calls drm_fb_helper_find_sizes(), followed by drm_fbdev_generic_helper_fb_probe(): - The former tries to find a suitable buffer format, taking into account limitations of the whole display pipeline, - The latter just calls drm_mode_legacy_fb_format() again.Simplify this by passing the buffer format between these functions via a new buffer format member in the drm_fb_helper_surface_size structure.
That is a bit premature and I'd like to not merge this patch.A number of drivers implement fbdev emulation with their own workarounds for surface_bpp and surface_depth. My plan has been to push _find_sizes() into the drivers' fb_probe helpers and let them handle everything. Once everything has been cleaned up, surface_bpp and surface_depth can hopefully be removed entirely.
Best regards Thomas
Signed-off-by: Geert Uytterhoeven <ge...@linux-m68k.org> Reviewed-by: Javier Martinez Canillas <javi...@redhat.com> Tested-by: Javier Martinez Canillas <javi...@redhat.com> --- v2: - Fix accidental debug level increase, - Add Reviewed-by, Tested-by. --- drivers/gpu/drm/drm_fb_helper.c | 1 + drivers/gpu/drm/drm_fbdev_generic.c | 9 ++++----- include/drm/drm_fb_helper.h | 2 ++ 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index d612133e2cf7ec99..4dc28fdcc1e0a6a4 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1564,6 +1564,7 @@ static int __drm_fb_helper_find_sizes(struct drm_fb_helper *fb_helper, info = drm_format_info(surface_format); sizes->surface_bpp = drm_format_info_bpp(info, 0); sizes->surface_depth = info->depth; + sizes->surface_format = surface_format;/* first up get a count of crtcs now in use and new min/maxes width/heights */crtc_count = 0; diff --git a/drivers/gpu/drm/drm_fbdev_generic.c b/drivers/gpu/drm/drm_fbdev_generic.c index d647d89764cb9894..3830d25bcc3ad035 100644 --- a/drivers/gpu/drm/drm_fbdev_generic.c +++ b/drivers/gpu/drm/drm_fbdev_generic.c @@ -77,16 +77,15 @@ static int drm_fbdev_generic_helper_fb_probe(struct drm_fb_helper *fb_helper, struct fb_info *info; size_t screen_size; void *screen_buffer; - u32 format; int ret;- drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n",+ drm_dbg_kms(dev, "surface width(%d), height(%d), bpp(%d) and format(%p4cc)\n", sizes->surface_width, sizes->surface_height, - sizes->surface_bpp); + sizes->surface_bpp, &sizes->surface_format);- format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);buffer = drm_client_framebuffer_create(client, sizes->surface_width, - sizes->surface_height, format); + sizes->surface_height, + sizes->surface_format); if (IS_ERR(buffer)) return PTR_ERR(buffer);diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.hindex 375737fd6c36ed19..aa3d62a531d12f37 100644 --- a/include/drm/drm_fb_helper.h +++ b/include/drm/drm_fb_helper.h @@ -45,6 +45,7 @@ struct drm_fb_helper; * @surface_height: scanout buffer height * @surface_bpp: scanout buffer bpp * @surface_depth: scanout buffer depth + * @surface_format: scanout buffer format (optional) * * Note that the scanout surface width/height may be larger than the fbdev * width/height. In case of multiple displays, the scanout surface is sized @@ -61,6 +62,7 @@ struct drm_fb_helper_surface_size { u32 surface_height; u32 surface_bpp; u32 surface_depth; + u32 surface_format; };/**
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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