drm/format-helper: Rework XRGB8888-to-RGBG332 conversion

Update XRGB8888-to-RGB332 conversion to support struct iosys_map
and convert all users. Although these are single-plane color formats,
the new interface supports multi-plane formats for consistency with
drm_fb_blit().

v2:
	* rebase onto refactored Kunit tests
	* update documentation (Sam)
	* add TODO on vaddr location (Sam)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220808125406.20752-6-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index b5ed058..248fd87 100644 (file)
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -281,18 +281,42 @@ static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigne
 
 /**
  * drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
- * @dst: RGB332 destination buffer
- * @dst_pitch: Number of bytes between two consecutive scanlines within dst
- * @src: XRGB8888 source buffer
+ * @dst: Array of RGB332 destination buffers
+ * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
+ *             within @dst; can be NULL if scanlines are stored next to each other.
+ * @vmap: Array of XRGB8888 source buffers
  * @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 copies parts of a framebuffer to display memory and converts the
+ * color format during the process. Destination and framebuffer formats must match. The
+ * parameters @dst, @dst_pitch and @vmap refer to arrays. Each array must have at
+ * least as many entries as there are planes in @fb's format. Each entry stores the
+ * value for the format's respective color plane at the same index.
+ *
+ * This function does not apply clipping on @dst (i.e. the destination is at the
+ * top-left corner).
+ *
+ * Drivers can use this function for RGB332 devices that don't support XRGB8888 natively.
  */
-void drm_fb_xrgb8888_to_rgb332(void *dst, unsigned int dst_pitch, const void *src,
-                              const struct drm_framebuffer *fb, const struct drm_rect *clip)
+void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int *dst_pitch,
+                              const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+                              const struct drm_rect *clip)
 {
-       drm_fb_xfrm(dst, dst_pitch, 1, src, fb, clip, false, drm_fb_xrgb8888_to_rgb332_line);
+       static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
+               0, 0, 0, 0
+       };
+
+       if (!dst_pitch)
+               dst_pitch = default_dst_pitch;
+
+       /* TODO: handle vmap in I/O memory here */
+       if (dst[0].is_iomem)
+               drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], 1, vmap[0].vaddr, fb, clip,
+                                false, drm_fb_xrgb8888_to_rgb332_line);
+       else
+               drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], 1, vmap[0].vaddr, fb, clip,
+                           false, drm_fb_xrgb8888_to_rgb332_line);
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
 

diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
index a15cda9..426a3ae 100644 (file)
--- a/drivers/gpu/drm/gud/gud_pipe.c
+++ b/drivers/gpu/drm/gud/gud_pipe.c
@@ -196,7 +196,7 @@ retry:
                } else if (format->format == DRM_FORMAT_R8) {
                        drm_fb_xrgb8888_to_gray8(buf, 0, vaddr, fb, rect);
                } else if (format->format == DRM_FORMAT_RGB332) {
-                       drm_fb_xrgb8888_to_rgb332(buf, 0, vaddr, fb, rect);
+                       drm_fb_xrgb8888_to_rgb332(&dst, NULL, map_data, fb, rect);
                } else if (format->format == DRM_FORMAT_RGB565) {
                        drm_fb_xrgb8888_to_rgb565(buf, 0, vaddr, fb, rect, gud_is_big_endian());
                } else if (format->format == DRM_FORMAT_RGB888) {

diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 26ecf3b..7b14694 100644 (file)
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -197,8 +197,9 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
        const struct convert_xrgb8888_case *params = test->param_value;
        const struct convert_to_rgb332_result *result = &params->rgb332_result;
        size_t dst_size;
-       __u8 *dst = NULL;
-       __u32 *src = NULL;
+       __u8 *buf = NULL;
+       __u32 *xrgb8888 = NULL;
+       struct iosys_map dst, src;
 
        struct drm_framebuffer fb = {
                .format = drm_format_info(DRM_FORMAT_XRGB8888),
@@ -209,15 +210,16 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
                                       &params->clip);
        KUNIT_ASSERT_GT(test, dst_size, 0);
 
-       dst = kunit_kzalloc(test, dst_size, GFP_KERNEL);
-       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
+       buf = kunit_kzalloc(test, dst_size, GFP_KERNEL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
+       iosys_map_set_vaddr(&dst, buf);
 
-       src = le32buf_to_cpu(test, params->xrgb8888, TEST_BUF_SIZE);
-       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, src);
+       xrgb8888 = le32buf_to_cpu(test, params->xrgb8888, TEST_BUF_SIZE);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
+       iosys_map_set_vaddr(&src, xrgb8888);
 
-       drm_fb_xrgb8888_to_rgb332(dst, result->dst_pitch, src, &fb,
-                                 &params->clip);
-       KUNIT_EXPECT_EQ(test, memcmp(dst, result->expected, dst_size), 0);
+       drm_fb_xrgb8888_to_rgb332(&dst, &result->dst_pitch, &src, &fb, &params->clip);
+       KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
 }
 
 static void xrgb8888_to_rgb565_test(struct kunit *test)

diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 60944fe..3c28f09 100644 (file)
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -20,8 +20,9 @@ void drm_fb_memcpy(struct iosys_map *dst, const unsigned int *dst_pitch,
 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_rgb332(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_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void *vaddr,
                               const struct drm_framebuffer *fb, const struct drm_rect *clip,
                               bool swab);