Hi Thomas,
On Wed, Jul 27, 2022 at 01:33:03PM +0200, Thomas Zimmermann wrote:
> Convert drm_fb_swab() to use struct iosys_map() and convert users. The
> new interface supports multi-plane color formats.
It swabs only plane[0], sbut this is maybe enough to say so.
A few comments in the following.
Sam
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
> drivers/gpu/drm/drm_format_helper.c | 38 +++++++++++++++++++++--------
> drivers/gpu/drm/drm_mipi_dbi.c | 2 +-
> drivers/gpu/drm/gud/gud_pipe.c | 2 +-
> include/drm/drm_format_helper.h | 6 ++---
> 4 files changed, 33 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index 49589b442f18..fa22d3cb11e8 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -196,9 +196,9 @@ static void drm_fb_swab32_line(void *dbuf, const void *sbuf, unsigned int pixels
>
> /**
> * drm_fb_swab - Swap bytes into clip buffer
> - * @dst: Destination buffer
> - * @dst_pitch: Number of bytes between two consecutive scanlines within dst
> - * @src: Source buffer
> + * @dst: Array of destination buffers
> + * @dst_pitch: Array of numbers of bytes between two consecutive scanlines within dst
Document that it may be NULL?
> + * @vmap: Array of source buffers
Prefer that the source is named src, and vmap smells like system
(virtual) memory to me.
Also vmap must be system memory - but this is maybe fixed later.
> * @fb: DRM framebuffer
> * @clip: Clip rectangle area to copy
> * @cached: Source buffer is mapped cached (eg. not write-combined)
> @@ -209,24 +209,42 @@ static void drm_fb_swab32_line(void *dbuf, const void *sbuf, unsigned int pixels
> * This function does not apply clipping on dst, i.e. the destination
> * is at the top-left corner.
> */
> -void drm_fb_swab(void *dst, unsigned int dst_pitch, const void *src,
> - const struct drm_framebuffer *fb, const struct drm_rect *clip,
> - bool cached)
> +void drm_fb_swab(struct iosys_map *dst, const unsigned int *dst_pitch,
> + const struct iosys_map *vmap, const struct drm_framebuffer *fb,
> + const struct drm_rect *clip, bool cached)
> {
> - u8 cpp = fb->format->cpp[0];
> + static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
> + 0, 0, 0, 0
> + };
> + const struct drm_format_info *format = fb->format;
> + u8 cpp = format->cpp[0];
u8 cpp = drm_format_info_bpp(format, 0) / 8;
> + void (*swab_line)(void *dbuf, const void *sbuf, unsigned int npixels);
>
> switch (cpp) {
> case 4:
> - drm_fb_xfrm(dst, dst_pitch, cpp, src, fb, clip, cached, drm_fb_swab32_line);
> + swab_line = drm_fb_swab32_line;
> break;
> case 2:
> - drm_fb_xfrm(dst, dst_pitch, cpp, src, fb, clip, cached, drm_fb_swab16_line);
> + swab_line = drm_fb_swab16_line;
> break;
> default:
> drm_warn_once(fb->dev, "Format %p4cc has unsupported pixel size.\n",
> - &fb->format->format);
> + &format->format);
> + swab_line = NULL;
> break;
> }
> + if (!swab_line)
> + return;
> +
> + if (!dst_pitch)
> + dst_pitch = default_dst_pitch;
> +
> + if (dst->is_iomem)
> + drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], cpp,
> + vmap[0].vaddr, fb, clip, cached, swab_line);
> + else
> + drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], cpp, vmap[0].vaddr, fb,
> + clip, cached, swab_line);
Here vmap is assumes system memory, not IO. I assume this is fixed
later.
> }
> EXPORT_SYMBOL(drm_fb_swab);
>
> diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
> index 22451806fb5c..973a75585cad 100644
> --- a/drivers/gpu/drm/drm_mipi_dbi.c
> +++ b/drivers/gpu/drm/drm_mipi_dbi.c
> @@ -221,7 +221,7 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
> switch (fb->format->format) {
> case DRM_FORMAT_RGB565:
> if (swap)
> - drm_fb_swab(dst, 0, src, fb, clip, !gem->import_attach);
> + drm_fb_swab(&dst_map, NULL, data, fb, clip, !gem->import_attach);
> else
> drm_fb_memcpy(&dst_map, NULL, data, fb, clip);
> break;
> diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
> index 449c95a4aee0..a15cda9ba058 100644
> --- a/drivers/gpu/drm/gud/gud_pipe.c
> +++ b/drivers/gpu/drm/gud/gud_pipe.c
> @@ -205,7 +205,7 @@ static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
> len = gud_xrgb8888_to_color(buf, format, vaddr, fb, rect);
> }
> } else if (gud_is_big_endian() && format->cpp[0] > 1) {
> - drm_fb_swab(buf, 0, vaddr, fb, rect, !import_attach);
> + drm_fb_swab(&dst, NULL, map_data, fb, rect, !import_attach);
> } else if (compression && !import_attach && pitch == fb->pitches[0]) {
> /* can compress directly from the framebuffer */
> buf = vaddr + rect->y1 * pitch;
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index 8af6a2717bc9..60944feaa936 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -17,9 +17,9 @@ unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info
> void drm_fb_memcpy(struct iosys_map *dst, const unsigned int *dst_pitch,
> const struct iosys_map *vmap, const struct drm_framebuffer *fb,
> const struct drm_rect *clip);
> -void drm_fb_swab(void *dst, unsigned int dst_pitch, const void *src,
> - const struct drm_framebuffer *fb, const struct drm_rect *clip,
> - bool cached);
> +void drm_fb_swab(struct iosys_map *dst, const unsigned int *dst_pitch,
> + const struct iosys_map *vmap, const struct drm_framebuffer *fb,
> + const struct drm_rect *clip, bool cached);
> void drm_fb_xrgb8888_to_rgb332(void *dst, unsigned int dst_pitch, const void *vaddr,
> const struct drm_framebuffer *fb, const struct drm_rect *clip);
> void drm_fb_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void *vaddr,
> --
> 2.37.1
