drm/format-helper: Add drm_fb_xrgb8888_to_rgb332()

Add XRGB8888 emulation support for devices that can only do RGB332.

v2:
- Support Big Endian (Daniel)

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-3-noralf@tronnes.org

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 5231104..dab4f38 100644 (file)
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -135,6 +135,56 @@ void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
 }
 EXPORT_SYMBOL(drm_fb_swab);
 
+static void drm_fb_xrgb8888_to_rgb332_line(u8 *dbuf, __le32 *sbuf, unsigned int pixels)
+{
+       unsigned int x;
+       u32 pix;
+
+       for (x = 0; x < pixels; x++) {
+               pix = le32_to_cpu(sbuf[x]);
+               dbuf[x] = ((pix & 0x00e00000) >> 16) |
+                         ((pix & 0x0000e000) >> 11) |
+                         ((pix & 0x000000c0) >> 6);
+       }
+}
+
+/**
+ * drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
+ * @dst: RGB332 destination buffer
+ * @src: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ *
+ * Drivers can use this function for RGB332 devices that don't natively support XRGB8888.
+ *
+ * This function does not apply clipping on dst, i.e. the destination is a small buffer
+ * containing the clip rect only.
+ */
+void drm_fb_xrgb8888_to_rgb332(void *dst, void *src, struct drm_framebuffer *fb,
+                              struct drm_rect *clip)
+{
+       size_t width = drm_rect_width(clip);
+       size_t src_len = width * sizeof(u32);
+       unsigned int y;
+       void *sbuf;
+
+       /* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */
+       sbuf = kmalloc(src_len, GFP_KERNEL);
+       if (!sbuf)
+               return;
+
+       src += clip_offset(clip, fb->pitches[0], sizeof(u32));
+       for (y = 0; y < drm_rect_height(clip); y++) {
+               memcpy(sbuf, src, src_len);
+               drm_fb_xrgb8888_to_rgb332_line(dst, sbuf, width);
+               src += fb->pitches[0];
+               dst += width;
+       }
+
+       kfree(sbuf);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
+
 static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
                                           unsigned int pixels,
                                           bool swab)

diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 4e0258a..d0809af 100644 (file)
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -16,6 +16,8 @@ void drm_fb_memcpy_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vadd
                           struct drm_rect *clip);
 void drm_fb_swab(void *dst, void *src, struct drm_framebuffer *fb,
                 struct drm_rect *clip, bool cached);
+void drm_fb_xrgb8888_to_rgb332(void *dst, void *vaddr, struct drm_framebuffer *fb,
+                              struct drm_rect *clip);
 void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
                               struct drm_framebuffer *fb,
                               struct drm_rect *clip, bool swab);