| Message ID | 20220204134347.1187749-2-javierm@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | drm/tiny: Add driver for Solomon SSD1307 OLED displays | expand |
Hi Am 04.02.22 um 14:43 schrieb Javier Martinez Canillas: > Add support to convert XR24 and 8-bit grayscale to reversed monochrome for > drivers that control monochromatic panels, that only have 1 bit per pixel. > > The drm_fb_gray8_to_mono_reversed() helper was based on the function that > does the same in the drivers/gpu/drm/tiny/repaper.c driver. > > Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> > --- > > (no changes since v1) > > drivers/gpu/drm/drm_format_helper.c | 80 +++++++++++++++++++++++++++++ > include/drm/drm_format_helper.h | 7 +++ > 2 files changed, 87 insertions(+) > > diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c > index 0f28dd2bdd72..cdce4b7c25d9 100644 > --- a/drivers/gpu/drm/drm_format_helper.c > +++ b/drivers/gpu/drm/drm_format_helper.c > @@ -584,3 +584,83 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for > return -EINVAL; > } > EXPORT_SYMBOL(drm_fb_blit_toio); > + > +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) > +{ > + unsigned int xb, i; > + > + for (xb = 0; xb < pixels / 8; xb++) { In practice, all mode widths are multiples of 8 because VGA mandated it. So it's ok-ish to assume this here. You should probably at least print a warning somewhere if (pixels % 8 != 0) > + u8 byte = 0x00; > + > + for (i = 0; i < 8; i++) { > + int x = xb * 8 + i; > + > + byte >>= 1; > + if (src[x] >> 7) > + byte |= BIT(7); > + } > + *dst++ = byte; > + } > +} > + > +/** > + * drm_fb_gray8_to_mono_reversed - Convert grayscale to reversed monochrome > + * @dst: reversed monochrome destination buffer > + * @dst_pitch: Number of bytes between two consecutive scanlines within dst > + * @src: 8-bit grayscale source buffer > + * @clip: Clip rectangle area to copy > + * > + * DRM doesn't have native monochrome or grayscale support. > + * Such drivers can announce the commonly supported XR24 format to userspace > + * and use drm_fb_xrgb8888_to_gray8() to convert to grayscale and then this > + * helper function to convert to the native format. > + */ > +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, > + const struct drm_rect *clip) There's a bug here. You want to pass in a drm_framebuffer as fourth argument. > +{ > + > + size_t height = drm_rect_height(clip); > + size_t width = drm_rect_width(clip); > + unsigned int y; > + const u8 *gray8 = src; > + u8 *mono = dst; > + > + if (!dst_pitch) > + dst_pitch = width; The dst_pitch is given in bytes. You have to device by 8. Here would be a good place to warn if (width % 8 != 0). > + > + for (y = 0; y < height; y++) { > + drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch); > + mono += (dst_pitch / 8); The dst_pitch is already given in bytes. > + gray8 += dst_pitch; 'gray8 += fb->pitches[0]' would be correct. > + } > +} > + > +/** > + * drm_fb_xrgb8888_to_mono_reversed - Convert XRGB8888 to reversed monochrome > + * @dst: reversed monochrome destination buffer > + * @dst_pitch: Number of bytes between two consecutive scanlines within dst > + * @src: XRGB8888 source buffer > + * @fb: DRM framebuffer > + * @clip: Clip rectangle area to copy > + * > + * DRM doesn't have native monochrome support. > + * Such drivers can announce the commonly supported XR24 format to userspace > + * and use this function to convert to the native format. > + * > + * This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and > + * then the result is converted from grayscale to reversed monohrome. > + */ > +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, > + const struct drm_framebuffer *fb, > + const struct drm_rect *clip) > +{ > + if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) > + return; > + > + if (!dst_pitch) > + dst_pitch = drm_rect_width(clip); > + > + drm_fb_xrgb8888_to_gray8(dst, dst_pitch, src, fb, clip); > + drm_fb_gray8_to_mono_reversed(dst, dst_pitch, dst, fb, clip); Converting from dst into dst can give incorrect results. At some point we probably want to add restrict qualifiers to these pointers, to help the compiler with optimizing. A better approach here is to pull the per-line conversion from drm_fb_xrgb8888_to_gray8() into a separate helper and implement a line-by-line conversion here. something like this: drm_fb_xrgb8888_to_mono_reversed() { char *tmp = kmalloc(size of a single line of gray8) for (heigth) { drm_fb_xrgb8888_to_gray8_line(tmp, ..., src, ...); drm_fb_gray8_to_mono_reversed(dst, ..., tmp, ...); src += fb->pitches[0] dst += dst_pitch; } kfree(tmp); } Best regards Thomas > +} > +EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono_reversed); > diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h > index b30ed5de0a33..85e551a5cbe6 100644 > --- a/include/drm/drm_format_helper.h > +++ b/include/drm/drm_format_helper.h > @@ -43,4 +43,11 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for > const void *vmap, const struct drm_framebuffer *fb, > const struct drm_rect *rect); > > +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, > + const struct drm_rect *clip); > + > +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, > + const struct drm_framebuffer *fb, > + const struct drm_rect *clip); > + > #endif /* __LINUX_DRM_FORMAT_HELPER_H */
Am 04.02.22 um 16:52 schrieb Thomas Zimmermann: [...] >> +/** >> + * drm_fb_xrgb8888_to_mono_reversed - Convert XRGB8888 to reversed >> monochrome >> + * @dst: reversed monochrome destination buffer >> + * @dst_pitch: Number of bytes between two consecutive scanlines >> within dst >> + * @src: XRGB8888 source buffer >> + * @fb: DRM framebuffer >> + * @clip: Clip rectangle area to copy >> + * >> + * DRM doesn't have native monochrome support. >> + * Such drivers can announce the commonly supported XR24 format to >> userspace >> + * and use this function to convert to the native format. >> + * >> + * This function uses drm_fb_xrgb8888_to_gray8() to convert to >> grayscale and >> + * then the result is converted from grayscale to reversed monohrome. >> + */ >> +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int >> dst_pitch, const void *src, >> + const struct drm_framebuffer *fb, >> + const struct drm_rect *clip) >> +{ >> + if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) >> + return; >> + >> + if (!dst_pitch) >> + dst_pitch = drm_rect_width(clip); >> + >> + drm_fb_xrgb8888_to_gray8(dst, dst_pitch, src, fb, clip); >> + drm_fb_gray8_to_mono_reversed(dst, dst_pitch, dst, fb, clip); > > Converting from dst into dst can give incorrect results. At some point > we probably want to add restrict qualifiers to these pointers, to help > the compiler with optimizing. > > A better approach here is to pull the per-line conversion from > drm_fb_xrgb8888_to_gray8() into a separate helper and implement a > line-by-line conversion here. something like this: > > drm_fb_xrgb8888_to_mono_reversed() > { > char *tmp = kmalloc(size of a single line of gray8) > > for (heigth) { > drm_fb_xrgb8888_to_gray8_line(tmp, ..., src, ...); > drm_fb_gray8_to_mono_reversed(dst, ..., tmp, ...); Here, I meant 'drm_fb_gray8_to_mono_reversed_line()' > > src += fb->pitches[0] > dst += dst_pitch; > } > > kfree(tmp); > } To elaborate, this is an example of what I meant by composable. In the future, we can generalize this function and hand-in 2 function pointers the do the conversion with tmp as intermediate buffer. That would work for any combination of formats that have a common intermediate format. > > Best regards > Thomas > >> +} >> +EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono_reversed); >> diff --git a/include/drm/drm_format_helper.h >> b/include/drm/drm_format_helper.h >> index b30ed5de0a33..85e551a5cbe6 100644 >> --- a/include/drm/drm_format_helper.h >> +++ b/include/drm/drm_format_helper.h >> @@ -43,4 +43,11 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned >> int dst_pitch, uint32_t dst_for >> const void *vmap, const struct drm_framebuffer *fb, >> const struct drm_rect *rect); >> +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, >> const void *src, >> + const struct drm_rect *clip); >> + >> +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int >> dst_pitch, const void *src, >> + const struct drm_framebuffer *fb, >> + const struct drm_rect *clip); >> + >> #endif /* __LINUX_DRM_FORMAT_HELPER_H */ >
Hello Thomas, Thanks a lot for your feedback. On 2/4/22 16:52, Thomas Zimmermann wrote: [snip] >> +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) >> +{ >> + unsigned int xb, i; >> + >> + for (xb = 0; xb < pixels / 8; xb++) { > > In practice, all mode widths are multiples of 8 because VGA mandated it. > So it's ok-ish to assume this here. You should probably at least print a > warning somewhere if (pixels % 8 != 0) > Agreed. [snip] >> + * DRM doesn't have native monochrome or grayscale support. >> + * Such drivers can announce the commonly supported XR24 format to userspace >> + * and use drm_fb_xrgb8888_to_gray8() to convert to grayscale and then this >> + * helper function to convert to the native format. >> + */ >> +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, >> + const struct drm_rect *clip) > > There's a bug here. You want to pass in a drm_framebuffer as fourth > argument. > >> +{ >> + >> + size_t height = drm_rect_height(clip); >> + size_t width = drm_rect_width(clip); >> + unsigned int y; >> + const u8 *gray8 = src; >> + u8 *mono = dst; >> + >> + if (!dst_pitch) >> + dst_pitch = width; > > The dst_pitch is given in bytes. You have to device by 8. Here would be > a good place to warn if (width % 8 != 0). > Ok. >> + >> + for (y = 0; y < height; y++) { >> + drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch); >> + mono += (dst_pitch / 8); > > The dst_pitch is already given in bytes. > Yes, I know but for reversed mono we want only 1/8 of the width since we are converting from 8 bits per pixel greyscale to 1 bit per pixel mono. Or am I misunderstanding what you meant ? >> + gray8 += dst_pitch; > > 'gray8 += fb->pitches[0]' would be correct. > Ok. [snip] >> + */ >> +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, >> + const struct drm_framebuffer *fb, >> + const struct drm_rect *clip) >> +{ >> + if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) >> + return; >> + >> + if (!dst_pitch) >> + dst_pitch = drm_rect_width(clip); >> + >> + drm_fb_xrgb8888_to_gray8(dst, dst_pitch, src, fb, clip); >> + drm_fb_gray8_to_mono_reversed(dst, dst_pitch, dst, fb, clip); > > Converting from dst into dst can give incorrect results. At some point > we probably want to add restrict qualifiers to these pointers, to help > the compiler with optimizing. > > A better approach here is to pull the per-line conversion from > drm_fb_xrgb8888_to_gray8() into a separate helper and implement a > line-by-line conversion here. something like this: > > drm_fb_xrgb8888_to_mono_reversed() > { > char *tmp = kmalloc(size of a single line of gray8) > > for (heigth) { > drm_fb_xrgb8888_to_gray8_line(tmp, ..., src, ...); > drm_fb_gray8_to_mono_reversed(dst, ..., tmp, ...); > > src += fb->pitches[0] > dst += dst_pitch; > } > > kfree(tmp); > } > I see. Yes, that sounds a much better approach. I'll change it in v3. Best regards,
Hi Am 04.02.22 um 20:31 schrieb Javier Martinez Canillas: > Hello Thomas, > > Thanks a lot for your feedback. > > On 2/4/22 16:52, Thomas Zimmermann wrote: > > [snip] > >>> +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) >>> +{ >>> + unsigned int xb, i; >>> + >>> + for (xb = 0; xb < pixels / 8; xb++) { >> >> In practice, all mode widths are multiples of 8 because VGA mandated it. >> So it's ok-ish to assume this here. You should probably at least print a >> warning somewhere if (pixels % 8 != 0) >> > > Agreed. After sending the mail, I realized that some code copies only parts of the source around; specifically for damage handling. None of this is aligned to multiple of 8. So the copying could start and end in the middle of bytes. You'd need a pixel-offset value of some sort. If you don't want to handle this now, maybe at least detect this case and put a warning somewhere. > > [snip] > >>> + * DRM doesn't have native monochrome or grayscale support. >>> + * Such drivers can announce the commonly supported XR24 format to userspace >>> + * and use drm_fb_xrgb8888_to_gray8() to convert to grayscale and then this >>> + * helper function to convert to the native format. >>> + */ >>> +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, >>> + const struct drm_rect *clip) >> >> There's a bug here. You want to pass in a drm_framebuffer as fourth >> argument. >> >>> +{ >>> + >>> + size_t height = drm_rect_height(clip); >>> + size_t width = drm_rect_width(clip); >>> + unsigned int y; >>> + const u8 *gray8 = src; >>> + u8 *mono = dst; >>> + >>> + if (!dst_pitch) >>> + dst_pitch = width; >> >> The dst_pitch is given in bytes. You have to device by 8. Here would be >> a good place to warn if (width % 8 != 0). >> > > Ok. > >>> + >>> + for (y = 0; y < height; y++) { >>> + drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch); >>> + mono += (dst_pitch / 8); >> >> The dst_pitch is already given in bytes. >> > > Yes, I know but for reversed mono we want only 1/8 of the width since we > are converting from 8 bits per pixel greyscale to 1 bit per pixel mono. > > Or am I misunderstanding what you meant ? I mean that if there are 80 pixel on a scanline, the value of dst_pitch is already 10. These pitch values are always given in bytes. Best regards Thomas > >>> + gray8 += dst_pitch; >> >> 'gray8 += fb->pitches[0]' would be correct. >> > > Ok. > > [snip] > >>> + */ >>> +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, >>> + const struct drm_framebuffer *fb, >>> + const struct drm_rect *clip) >>> +{ >>> + if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) >>> + return; >>> + >>> + if (!dst_pitch) >>> + dst_pitch = drm_rect_width(clip); >>> + >>> + drm_fb_xrgb8888_to_gray8(dst, dst_pitch, src, fb, clip); >>> + drm_fb_gray8_to_mono_reversed(dst, dst_pitch, dst, fb, clip); >> >> Converting from dst into dst can give incorrect results. At some point >> we probably want to add restrict qualifiers to these pointers, to help >> the compiler with optimizing. >> >> A better approach here is to pull the per-line conversion from >> drm_fb_xrgb8888_to_gray8() into a separate helper and implement a >> line-by-line conversion here. something like this: >> >> drm_fb_xrgb8888_to_mono_reversed() >> { >> char *tmp = kmalloc(size of a single line of gray8) >> >> for (heigth) { >> drm_fb_xrgb8888_to_gray8_line(tmp, ..., src, ...); >> drm_fb_gray8_to_mono_reversed(dst, ..., tmp, ...); >> >> src += fb->pitches[0] >> dst += dst_pitch; >> } >> >> kfree(tmp); >> } >> > > I see. Yes, that sounds a much better approach. I'll change it in v3. > > Best regards,
On Fri, Feb 4, 2022 at 10:53 AM Thomas Zimmermann <tzimmermann@suse.de> wrote: > > Hi > > Am 04.02.22 um 14:43 schrieb Javier Martinez Canillas: > > Add support to convert XR24 and 8-bit grayscale to reversed monochrome for > > drivers that control monochromatic panels, that only have 1 bit per pixel. > > > > The drm_fb_gray8_to_mono_reversed() helper was based on the function that > > does the same in the drivers/gpu/drm/tiny/repaper.c driver. > > > > Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> > > --- > > > > (no changes since v1) > > > > drivers/gpu/drm/drm_format_helper.c | 80 +++++++++++++++++++++++++++++ > > include/drm/drm_format_helper.h | 7 +++ > > 2 files changed, 87 insertions(+) > > > > diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c > > index 0f28dd2bdd72..cdce4b7c25d9 100644 > > --- a/drivers/gpu/drm/drm_format_helper.c > > +++ b/drivers/gpu/drm/drm_format_helper.c > > @@ -584,3 +584,83 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for > > return -EINVAL; > > } > > EXPORT_SYMBOL(drm_fb_blit_toio); > > + > > +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) > > +{ > > + unsigned int xb, i; > > + > > + for (xb = 0; xb < pixels / 8; xb++) { > > In practice, all mode widths are multiples of 8 because VGA mandated it. > So it's ok-ish to assume this here. You should probably at least print a > warning somewhere if (pixels % 8 != 0) Not sure if it's relevant, but 1366x768 was a fairly popular laptop resolution. There's even a dedicated drm_mode_fixup_1366x768 in drm_edid.c. (Would it have killed them to add 2 more horizontal pixels? Apparently.) Cheers, -ilia
Hi Am 04.02.22 um 22:02 schrieb Ilia Mirkin: > On Fri, Feb 4, 2022 at 10:53 AM Thomas Zimmermann <tzimmermann@suse.de> wrote: >> >> Hi >> >> Am 04.02.22 um 14:43 schrieb Javier Martinez Canillas: >>> Add support to convert XR24 and 8-bit grayscale to reversed monochrome for >>> drivers that control monochromatic panels, that only have 1 bit per pixel. >>> >>> The drm_fb_gray8_to_mono_reversed() helper was based on the function that >>> does the same in the drivers/gpu/drm/tiny/repaper.c driver. >>> >>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> >>> --- >>> >>> (no changes since v1) >>> >>> drivers/gpu/drm/drm_format_helper.c | 80 +++++++++++++++++++++++++++++ >>> include/drm/drm_format_helper.h | 7 +++ >>> 2 files changed, 87 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c >>> index 0f28dd2bdd72..cdce4b7c25d9 100644 >>> --- a/drivers/gpu/drm/drm_format_helper.c >>> +++ b/drivers/gpu/drm/drm_format_helper.c >>> @@ -584,3 +584,83 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for >>> return -EINVAL; >>> } >>> EXPORT_SYMBOL(drm_fb_blit_toio); >>> + >>> +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) >>> +{ >>> + unsigned int xb, i; >>> + >>> + for (xb = 0; xb < pixels / 8; xb++) { >> >> In practice, all mode widths are multiples of 8 because VGA mandated it. >> So it's ok-ish to assume this here. You should probably at least print a >> warning somewhere if (pixels % 8 != 0) > > Not sure if it's relevant, but 1366x768 was a fairly popular laptop > resolution. There's even a dedicated drm_mode_fixup_1366x768 in > drm_edid.c. (Would it have killed them to add 2 more horizontal > pixels? Apparently.) D'oh! Do you know how the text console looks in this mode? Fonts still expect a multiple of 8. Best regards Thomas > > Cheers, > > -ilia
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 0f28dd2bdd72..cdce4b7c25d9 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -584,3 +584,83 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for return -EINVAL; } EXPORT_SYMBOL(drm_fb_blit_toio); + +static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, size_t pixels) +{ + unsigned int xb, i; + + for (xb = 0; xb < pixels / 8; xb++) { + u8 byte = 0x00; + + for (i = 0; i < 8; i++) { + int x = xb * 8 + i; + + byte >>= 1; + if (src[x] >> 7) + byte |= BIT(7); + } + *dst++ = byte; + } +} + +/** + * drm_fb_gray8_to_mono_reversed - Convert grayscale to reversed monochrome + * @dst: reversed monochrome destination buffer + * @dst_pitch: Number of bytes between two consecutive scanlines within dst + * @src: 8-bit grayscale source buffer + * @clip: Clip rectangle area to copy + * + * DRM doesn't have native monochrome or grayscale support. + * Such drivers can announce the commonly supported XR24 format to userspace + * and use drm_fb_xrgb8888_to_gray8() to convert to grayscale and then this + * helper function to convert to the native format. + */ +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, + const struct drm_rect *clip) +{ + + size_t height = drm_rect_height(clip); + size_t width = drm_rect_width(clip); + unsigned int y; + const u8 *gray8 = src; + u8 *mono = dst; + + if (!dst_pitch) + dst_pitch = width; + + for (y = 0; y < height; y++) { + drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch); + mono += (dst_pitch / 8); + gray8 += dst_pitch; + } +} + +/** + * drm_fb_xrgb8888_to_mono_reversed - Convert XRGB8888 to reversed monochrome + * @dst: reversed monochrome destination buffer + * @dst_pitch: Number of bytes between two consecutive scanlines within dst + * @src: XRGB8888 source buffer + * @fb: DRM framebuffer + * @clip: Clip rectangle area to copy + * + * DRM doesn't have native monochrome support. + * Such drivers can announce the commonly supported XR24 format to userspace + * and use this function to convert to the native format. + * + * This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and + * then the result is converted from grayscale to reversed monohrome. + */ +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, + const struct drm_framebuffer *fb, + const struct drm_rect *clip) +{ + if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) + return; + + if (!dst_pitch) + dst_pitch = drm_rect_width(clip); + + drm_fb_xrgb8888_to_gray8(dst, dst_pitch, src, fb, clip); + drm_fb_gray8_to_mono_reversed(dst, dst_pitch, dst, fb, clip); +} +EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono_reversed); diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h index b30ed5de0a33..85e551a5cbe6 100644 --- a/include/drm/drm_format_helper.h +++ b/include/drm/drm_format_helper.h @@ -43,4 +43,11 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for const void *vmap, const struct drm_framebuffer *fb, const struct drm_rect *rect); +void drm_fb_gray8_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, + const struct drm_rect *clip); + +void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *src, + const struct drm_framebuffer *fb, + const struct drm_rect *clip); + #endif /* __LINUX_DRM_FORMAT_HELPER_H */
Add support to convert XR24 and 8-bit grayscale to reversed monochrome for drivers that control monochromatic panels, that only have 1 bit per pixel. The drm_fb_gray8_to_mono_reversed() helper was based on the function that does the same in the drivers/gpu/drm/tiny/repaper.c driver. Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> --- (no changes since v1) drivers/gpu/drm/drm_format_helper.c | 80 +++++++++++++++++++++++++++++ include/drm/drm_format_helper.h | 7 +++ 2 files changed, 87 insertions(+)