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SubjectRe: [PATCH v3 2/3] drm/format-helper: Add drm_fb_xrgb8888_to_xrgb2101010_toio()
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Am 12.12.21 um 07:24 schrieb Hector Martin:
> Add XRGB8888 emulation support for devices that can only do XRGB2101010.
>
> This is chiefly useful for simpledrm on Apple devices where the
> bootloader-provided framebuffer is 10-bit.
>
> Signed-off-by: Hector Martin <marcan@marcan.st>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
> drivers/gpu/drm/drm_format_helper.c | 64 +++++++++++++++++++++++++++++
> include/drm/drm_format_helper.h | 3 ++
> 2 files changed, 67 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index dbe3e830096e..0f28dd2bdd72 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -409,6 +409,61 @@ void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
> }
> EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_toio);
>
> +static void drm_fb_xrgb8888_to_xrgb2101010_line(u32 *dbuf, const u32 *sbuf,
> + unsigned int pixels)
> +{
> + unsigned int x;
> + u32 val32;
> +
> + for (x = 0; x < pixels; x++) {
> + val32 = ((sbuf[x] & 0x000000FF) << 2) |
> + ((sbuf[x] & 0x0000FF00) << 4) |
> + ((sbuf[x] & 0x00FF0000) << 6);
> + *dbuf++ = val32 | ((val32 >> 8) & 0x00300C03);
> + }
> +}
> +
> +/**
> + * drm_fb_xrgb8888_to_xrgb2101010_toio - Convert XRGB8888 to XRGB2101010 clip
> + * buffer
> + * @dst: XRGB2101010 destination buffer (iomem)
> + * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> + * @vaddr: XRGB8888 source buffer
> + * @fb: DRM framebuffer
> + * @clip: Clip rectangle area to copy
> + *
> + * Drivers can use this function for XRGB2101010 devices that don't natively
> + * support XRGB8888.
> + */
> +void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst,
> + unsigned int dst_pitch, const void *vaddr,
> + const struct drm_framebuffer *fb,
> + const struct drm_rect *clip)
> +{
> + size_t linepixels = clip->x2 - clip->x1;
> + size_t dst_len = linepixels * sizeof(u32);
> + unsigned int y, lines = clip->y2 - clip->y1;
> + void *dbuf;
> +
> + if (!dst_pitch)
> + dst_pitch = dst_len;
> +
> + dbuf = kmalloc(dst_len, GFP_KERNEL);
> + if (!dbuf)
> + return;
> +
> + vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
> + for (y = 0; y < lines; y++) {
> + drm_fb_xrgb8888_to_xrgb2101010_line(dbuf, vaddr, linepixels);
> + memcpy_toio(dst, dbuf, dst_len);
> + vaddr += fb->pitches[0];
> + dst += dst_pitch;
> + }
> +
> + kfree(dbuf);
> +}
> +EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010_toio);
> +
> /**
> * drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
> * @dst: 8-bit grayscale destination buffer
> @@ -500,6 +555,10 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for
> fb_format = DRM_FORMAT_XRGB8888;
> if (dst_format == DRM_FORMAT_ARGB8888)
> dst_format = DRM_FORMAT_XRGB8888;
> + if (fb_format == DRM_FORMAT_ARGB2101010)
> + fb_format = DRM_FORMAT_XRGB2101010;
> + if (dst_format == DRM_FORMAT_ARGB2101010)
> + dst_format = DRM_FORMAT_XRGB2101010;
>
> if (dst_format == fb_format) {
> drm_fb_memcpy_toio(dst, dst_pitch, vmap, fb, clip);
> @@ -515,6 +574,11 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for
> drm_fb_xrgb8888_to_rgb888_toio(dst, dst_pitch, vmap, fb, clip);
> return 0;
> }
> + } else if (dst_format == DRM_FORMAT_XRGB2101010) {
> + if (fb_format == DRM_FORMAT_XRGB8888) {
> + drm_fb_xrgb8888_to_xrgb2101010_toio(dst, dst_pitch, vmap, fb, clip);
> + return 0;
> + }
> }
>
> return -EINVAL;
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index 97e4c3223af3..b30ed5de0a33 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -33,6 +33,9 @@ void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void *sr
> void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
> const void *vaddr, const struct drm_framebuffer *fb,
> const struct drm_rect *clip);
> +void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst, unsigned int dst_pitch,
> + const void *vaddr, const struct drm_framebuffer *fb,
> + const struct drm_rect *clip);
> void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr,
> const struct drm_framebuffer *fb, const struct drm_rect *clip);
>
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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