| Message ID | 20220905163300.391692-5-thierry.reding@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/simpledrm: Support system memory framebuffers | expand |
Hi Am 05.09.22 um 18:32 schrieb Thierry Reding: > From: Thierry Reding <treding@nvidia.com> > > Add a conversion helper for the AB24 format to use in drm_fb_blit(). > > Signed-off-by: Thierry Reding <treding@nvidia.com> > --- > drivers/gpu/drm/drm_format_helper.c | 35 +++++++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > > diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c > index 56642816fdff..d564412a816b 100644 > --- a/drivers/gpu/drm/drm_format_helper.c > +++ b/drivers/gpu/drm/drm_format_helper.c > @@ -503,6 +503,36 @@ static void drm_fb_rgb888_to_xrgb8888(struct iosys_map *dst, const unsigned int > drm_fb_rgb888_to_xrgb8888_line); > } > > +static void drm_fb_xrgb8888_to_abgr8888_line(void *dbuf, const void *sbuf, unsigned int pixels) > +{ > + __le32 *dbuf32 = dbuf; > + const __le32 *sbuf32 = sbuf; > + unsigned int x; > + u32 pix; > + > + for (x = 0; x < pixels; x++) { > + pix = le32_to_cpu(sbuf32[x]); > + pix = ((pix & 0xff000000) >> 24) << 24 | > + ((pix & 0x00ff0000) >> 16) << 0 | > + ((pix & 0x0000ff00) >> 8) << 8 | > + ((pix & 0x000000ff) >> 0) << 16; > + *dbuf32++ = cpu_to_le32(pix); > + } > +} What does the Jetson device do with these alpha bits? AFAIK the X channel's content is undefined. Shifting the bits into the A channel might result in wrong results in the general case. Better just set the alpha to 0xff unconditionally. > + > +static void drm_fb_xrgb8888_to_abgr8888(struct iosys_map *dst, const unsigned int *dst_pitch, > + const struct iosys_map *src, > + const struct drm_framebuffer *fb, > + const struct drm_rect *clip) > +{ > + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { > + 4, > + }; > + > + drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, > + drm_fb_xrgb8888_to_abgr8888_line); > +} > + > static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels) > { > __le32 *dbuf32 = dbuf; > @@ -672,6 +702,11 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d > drm_fb_rgb565_to_xrgb8888(dst, dst_pitch, src, fb, clip); > return 0; > } > + } else if (dst_format == DRM_FORMAT_ABGR8888) { > + if (fb_format == DRM_FORMAT_XRGB8888) { > + drm_fb_xrgb8888_to_abgr8888(dst, dst_pitch, src, fb, clip); > + return 0; > + } For the other alpha-containing formats, we treat them like non-alpha formats (see the top of this function). Maybe just do the same here and then implement the conversion as drm_fb_xrgb8888_to_xbgr8888() helpers? Best regards Thomas > } else if (dst_format == DRM_FORMAT_XRGB2101010) { > if (fb_format == DRM_FORMAT_XRGB8888) { > drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip);
On Wed, Sep 07, 2022 at 09:23:01AM +0200, Thomas Zimmermann wrote: > Hi > > Am 05.09.22 um 18:32 schrieb Thierry Reding: > > From: Thierry Reding <treding@nvidia.com> > > > > Add a conversion helper for the AB24 format to use in drm_fb_blit(). > > > > Signed-off-by: Thierry Reding <treding@nvidia.com> > > --- > > drivers/gpu/drm/drm_format_helper.c | 35 +++++++++++++++++++++++++++++ > > 1 file changed, 35 insertions(+) > > > > diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c > > index 56642816fdff..d564412a816b 100644 > > --- a/drivers/gpu/drm/drm_format_helper.c > > +++ b/drivers/gpu/drm/drm_format_helper.c > > @@ -503,6 +503,36 @@ static void drm_fb_rgb888_to_xrgb8888(struct iosys_map *dst, const unsigned int > > drm_fb_rgb888_to_xrgb8888_line); > > } > > +static void drm_fb_xrgb8888_to_abgr8888_line(void *dbuf, const void *sbuf, unsigned int pixels) > > +{ > > + __le32 *dbuf32 = dbuf; > > + const __le32 *sbuf32 = sbuf; > > + unsigned int x; > > + u32 pix; > > + > > + for (x = 0; x < pixels; x++) { > > + pix = le32_to_cpu(sbuf32[x]); > > + pix = ((pix & 0xff000000) >> 24) << 24 | > > + ((pix & 0x00ff0000) >> 16) << 0 | > > + ((pix & 0x0000ff00) >> 8) << 8 | > > + ((pix & 0x000000ff) >> 0) << 16; > > + *dbuf32++ = cpu_to_le32(pix); > > + } > > +} > > What does the Jetson device do with these alpha bits? > > AFAIK the X channel's content is undefined. Shifting the bits into the A > channel might result in wrong results in the general case. Better just set > the alpha to 0xff unconditionally. I'm not exactly sure, so I'd have to do some digging. I suspect that perhaps this might actually be XBGR rather than ABGR, so this may end up doing nothing. EFI FB reports this as ABGR, at least if I read the output right, so that's what I went with for the DT implementation. > > + > > +static void drm_fb_xrgb8888_to_abgr8888(struct iosys_map *dst, const unsigned int *dst_pitch, > > + const struct iosys_map *src, > > + const struct drm_framebuffer *fb, > > + const struct drm_rect *clip) > > +{ > > + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { > > + 4, > > + }; > > + > > + drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, > > + drm_fb_xrgb8888_to_abgr8888_line); > > +} > > + > > static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels) > > { > > __le32 *dbuf32 = dbuf; > > @@ -672,6 +702,11 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d > > drm_fb_rgb565_to_xrgb8888(dst, dst_pitch, src, fb, clip); > > return 0; > > } > > + } else if (dst_format == DRM_FORMAT_ABGR8888) { > > + if (fb_format == DRM_FORMAT_XRGB8888) { > > + drm_fb_xrgb8888_to_abgr8888(dst, dst_pitch, src, fb, clip); > > + return 0; > > + } > > For the other alpha-containing formats, we treat them like non-alpha formats > (see the top of this function). Maybe just do the same here and then > implement the conversion as drm_fb_xrgb8888_to_xbgr8888() helpers? Yeah, that's probably for the best. None of the boot splash uses alpha as far as I can tell and neither does the kernel framebuffer console, so there's really little point in trying to support it. Thierry
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 56642816fdff..d564412a816b 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -503,6 +503,36 @@ static void drm_fb_rgb888_to_xrgb8888(struct iosys_map *dst, const unsigned int drm_fb_rgb888_to_xrgb8888_line); } +static void drm_fb_xrgb8888_to_abgr8888_line(void *dbuf, const void *sbuf, unsigned int pixels) +{ + __le32 *dbuf32 = dbuf; + const __le32 *sbuf32 = sbuf; + unsigned int x; + u32 pix; + + for (x = 0; x < pixels; x++) { + pix = le32_to_cpu(sbuf32[x]); + pix = ((pix & 0xff000000) >> 24) << 24 | + ((pix & 0x00ff0000) >> 16) << 0 | + ((pix & 0x0000ff00) >> 8) << 8 | + ((pix & 0x000000ff) >> 0) << 16; + *dbuf32++ = cpu_to_le32(pix); + } +} + +static void drm_fb_xrgb8888_to_abgr8888(struct iosys_map *dst, const unsigned int *dst_pitch, + const struct iosys_map *src, + const struct drm_framebuffer *fb, + const struct drm_rect *clip) +{ + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { + 4, + }; + + drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, + drm_fb_xrgb8888_to_abgr8888_line); +} + static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels) { __le32 *dbuf32 = dbuf; @@ -672,6 +702,11 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d drm_fb_rgb565_to_xrgb8888(dst, dst_pitch, src, fb, clip); return 0; } + } else if (dst_format == DRM_FORMAT_ABGR8888) { + if (fb_format == DRM_FORMAT_XRGB8888) { + drm_fb_xrgb8888_to_abgr8888(dst, dst_pitch, src, fb, clip); + return 0; + } } else if (dst_format == DRM_FORMAT_XRGB2101010) { if (fb_format == DRM_FORMAT_XRGB8888) { drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip);