drm/format-helper: Move drm_fb_build_fourcc_list() to sysfb helpers

Thomas Zimmermann · Thomas Zimmermann · commit 1a45ef022f03 · 2025-06-18T10:46:03.000+02:00
Only sysfb drivers use drm_fb_build_fourcc_list(). Move the function to sysfb helpers and rename it accordingly. Update drivers and tests. v3: - update naming in tests v2: - select DRM_SYSFB_HELPER (kernel test robot) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: José Expósito <jose.exposito89@gmail.com> Acked-by: Maxime Ripard <mripard@kernel.org> Acked-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/20250616083846.221396-4-tzimmermann@suse.de
diff --git a/drivers/gpu/drm/Kconfig.debug b/drivers/gpu/drm/Kconfig.debug
@@ -70,6 +70,7 @@ config DRM_KUNIT_TEST
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KUNIT_TEST_HELPERS
 	select DRM_LIB_RANDOM
+	select DRM_SYSFB_HELPER
 	select PRIME_NUMBERS
 	default KUNIT_ALL_TESTS
 	help
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
@@ -1339,141 +1339,3 @@ void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitc
 	}
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono);
-
-static uint32_t drm_fb_nonalpha_fourcc(uint32_t fourcc)
-{
-	/* only handle formats with depth != 0 and alpha channel */
-	switch (fourcc) {
-	case DRM_FORMAT_ARGB1555:
-		return DRM_FORMAT_XRGB1555;
-	case DRM_FORMAT_ABGR1555:
-		return DRM_FORMAT_XBGR1555;
-	case DRM_FORMAT_RGBA5551:
-		return DRM_FORMAT_RGBX5551;
-	case DRM_FORMAT_BGRA5551:
-		return DRM_FORMAT_BGRX5551;
-	case DRM_FORMAT_ARGB8888:
-		return DRM_FORMAT_XRGB8888;
-	case DRM_FORMAT_ABGR8888:
-		return DRM_FORMAT_XBGR8888;
-	case DRM_FORMAT_RGBA8888:
-		return DRM_FORMAT_RGBX8888;
-	case DRM_FORMAT_BGRA8888:
-		return DRM_FORMAT_BGRX8888;
-	case DRM_FORMAT_ARGB2101010:
-		return DRM_FORMAT_XRGB2101010;
-	case DRM_FORMAT_ABGR2101010:
-		return DRM_FORMAT_XBGR2101010;
-	case DRM_FORMAT_RGBA1010102:
-		return DRM_FORMAT_RGBX1010102;
-	case DRM_FORMAT_BGRA1010102:
-		return DRM_FORMAT_BGRX1010102;
-	}
-
-	return fourcc;
-}
-
-static bool is_listed_fourcc(const uint32_t *fourccs, size_t nfourccs, uint32_t fourcc)
-{
-	const uint32_t *fourccs_end = fourccs + nfourccs;
-
-	while (fourccs < fourccs_end) {
-		if (*fourccs == fourcc)
-			return true;
-		++fourccs;
-	}
-	return false;
-}
-
-/**
- * drm_fb_build_fourcc_list - Filters a list of supported color formats against
- *                            the device's native formats
- * @dev: DRM device
- * @native_fourccs: 4CC codes of natively supported color formats
- * @native_nfourccs: The number of entries in @native_fourccs
- * @fourccs_out: Returns 4CC codes of supported color formats
- * @nfourccs_out: The number of available entries in @fourccs_out
- *
- * This function create a list of supported color format from natively
- * supported formats and additional emulated formats.
- * At a minimum, most userspace programs expect at least support for
- * XRGB8888 on the primary plane. Devices that have to emulate the
- * format, and possibly others, can use drm_fb_build_fourcc_list() to
- * create a list of supported color formats. The returned list can
- * be handed over to drm_universal_plane_init() et al. Native formats
- * will go before emulated formats. Native formats with alpha channel
- * will be replaced by such without, as primary planes usually don't
- * support alpha. Other heuristics might be applied
- * to optimize the order. Formats near the beginning of the list are
- * usually preferred over formats near the end of the list.
- *
- * Returns:
- * The number of color-formats 4CC codes returned in @fourccs_out.
- */
-size_t drm_fb_build_fourcc_list(struct drm_device *dev,
-				const u32 *native_fourccs, size_t native_nfourccs,
-				u32 *fourccs_out, size_t nfourccs_out)
-{
-	/*
-	 * XRGB8888 is the default fallback format for most of userspace
-	 * and it's currently the only format that should be emulated for
-	 * the primary plane. Only if there's ever another default fallback,
-	 * it should be added here.
-	 */
-	static const uint32_t extra_fourccs[] = {
-		DRM_FORMAT_XRGB8888,
-	};
-	static const size_t extra_nfourccs = ARRAY_SIZE(extra_fourccs);
-
-	u32 *fourccs = fourccs_out;
-	const u32 *fourccs_end = fourccs_out + nfourccs_out;
-	size_t i;
-
-	/*
-	 * The device's native formats go first.
-	 */
-
-	for (i = 0; i < native_nfourccs; ++i) {
-		/*
-		 * Several DTs, boot loaders and firmware report native
-		 * alpha formats that are non-alpha formats instead. So
-		 * replace alpha formats by non-alpha formats.
-		 */
-		u32 fourcc = drm_fb_nonalpha_fourcc(native_fourccs[i]);
-
-		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
-			continue; /* skip duplicate entries */
-		} else if (fourccs == fourccs_end) {
-			drm_warn(dev, "Ignoring native format %p4cc\n", &fourcc);
-			continue; /* end of available output buffer */
-		}
-
-		drm_dbg_kms(dev, "adding native format %p4cc\n", &fourcc);
-
-		*fourccs = fourcc;
-		++fourccs;
-	}
-
-	/*
-	 * The extra formats, emulated by the driver, go second.
-	 */
-
-	for (i = 0; (i < extra_nfourccs) && (fourccs < fourccs_end); ++i) {
-		u32 fourcc = extra_fourccs[i];
-
-		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
-			continue; /* skip duplicate and native entries */
-		} else if (fourccs == fourccs_end) {
-			drm_warn(dev, "Ignoring emulated format %p4cc\n", &fourcc);
-			continue; /* end of available output buffer */
-		}
-
-		drm_dbg_kms(dev, "adding emulated format %p4cc\n", &fourcc);
-
-		*fourccs = fourcc;
-		++fourccs;
-	}
-
-	return fourccs - fourccs_out;
-}
-EXPORT_SYMBOL(drm_fb_build_fourcc_list);
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_helper.h b/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
@@ -93,6 +93,10 @@ static inline struct drm_sysfb_device *to_drm_sysfb_device(struct drm_device *de
  * Plane
  */
 
+size_t drm_sysfb_build_fourcc_list(struct drm_device *dev,
+				   const u32 *native_fourccs, size_t native_nfourccs,
+				   u32 *fourccs_out, size_t nfourccs_out);
+
 int drm_sysfb_plane_helper_atomic_check(struct drm_plane *plane,
 					struct drm_atomic_state *new_state);
 void drm_sysfb_plane_helper_atomic_update(struct drm_plane *plane,
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c b/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
@@ -47,6 +47,144 @@ EXPORT_SYMBOL(drm_sysfb_mode);
  * Plane
  */
 
+static u32 to_nonalpha_fourcc(u32 fourcc)
+{
+	/* only handle formats with depth != 0 and alpha channel */
+	switch (fourcc) {
+	case DRM_FORMAT_ARGB1555:
+		return DRM_FORMAT_XRGB1555;
+	case DRM_FORMAT_ABGR1555:
+		return DRM_FORMAT_XBGR1555;
+	case DRM_FORMAT_RGBA5551:
+		return DRM_FORMAT_RGBX5551;
+	case DRM_FORMAT_BGRA5551:
+		return DRM_FORMAT_BGRX5551;
+	case DRM_FORMAT_ARGB8888:
+		return DRM_FORMAT_XRGB8888;
+	case DRM_FORMAT_ABGR8888:
+		return DRM_FORMAT_XBGR8888;
+	case DRM_FORMAT_RGBA8888:
+		return DRM_FORMAT_RGBX8888;
+	case DRM_FORMAT_BGRA8888:
+		return DRM_FORMAT_BGRX8888;
+	case DRM_FORMAT_ARGB2101010:
+		return DRM_FORMAT_XRGB2101010;
+	case DRM_FORMAT_ABGR2101010:
+		return DRM_FORMAT_XBGR2101010;
+	case DRM_FORMAT_RGBA1010102:
+		return DRM_FORMAT_RGBX1010102;
+	case DRM_FORMAT_BGRA1010102:
+		return DRM_FORMAT_BGRX1010102;
+	}
+
+	return fourcc;
+}
+
+static bool is_listed_fourcc(const u32 *fourccs, size_t nfourccs, u32 fourcc)
+{
+	const u32 *fourccs_end = fourccs + nfourccs;
+
+	while (fourccs < fourccs_end) {
+		if (*fourccs == fourcc)
+			return true;
+		++fourccs;
+	}
+	return false;
+}
+
+/**
+ * drm_sysfb_build_fourcc_list - Filters a list of supported color formats against
+ *                               the device's native formats
+ * @dev: DRM device
+ * @native_fourccs: 4CC codes of natively supported color formats
+ * @native_nfourccs: The number of entries in @native_fourccs
+ * @fourccs_out: Returns 4CC codes of supported color formats
+ * @nfourccs_out: The number of available entries in @fourccs_out
+ *
+ * This function create a list of supported color format from natively
+ * supported formats and additional emulated formats.
+ * At a minimum, most userspace programs expect at least support for
+ * XRGB8888 on the primary plane. Sysfb devices that have to emulate
+ * the format should use drm_sysfb_build_fourcc_list() to create a list
+ * of supported color formats. The returned list can be handed over to
+ * drm_universal_plane_init() et al. Native formats will go before
+ * emulated formats. Native formats with alpha channel will be replaced
+ * by equal formats without alpha channel, as primary planes usually
+ * don't support alpha. Other heuristics might be applied to optimize
+ * the sorting order. Formats near the beginning of the list are usually
+ * preferred over formats near the end of the list.
+ *
+ * Returns:
+ * The number of color-formats 4CC codes returned in @fourccs_out.
+ */
+size_t drm_sysfb_build_fourcc_list(struct drm_device *dev,
+				   const u32 *native_fourccs, size_t native_nfourccs,
+				   u32 *fourccs_out, size_t nfourccs_out)
+{
+	/*
+	 * XRGB8888 is the default fallback format for most of userspace
+	 * and it's currently the only format that should be emulated for
+	 * the primary plane. Only if there's ever another default fallback,
+	 * it should be added here.
+	 */
+	static const u32 extra_fourccs[] = {
+		DRM_FORMAT_XRGB8888,
+	};
+	static const size_t extra_nfourccs = ARRAY_SIZE(extra_fourccs);
+
+	u32 *fourccs = fourccs_out;
+	const u32 *fourccs_end = fourccs_out + nfourccs_out;
+	size_t i;
+
+	/*
+	 * The device's native formats go first.
+	 */
+
+	for (i = 0; i < native_nfourccs; ++i) {
+		/*
+		 * Several DTs, boot loaders and firmware report native
+		 * alpha formats that are non-alpha formats instead. So
+		 * replace alpha formats by non-alpha formats.
+		 */
+		u32 fourcc = to_nonalpha_fourcc(native_fourccs[i]);
+
+		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
+			continue; /* skip duplicate entries */
+		} else if (fourccs == fourccs_end) {
+			drm_warn(dev, "Ignoring native format %p4cc\n", &fourcc);
+			continue; /* end of available output buffer */
+		}
+
+		drm_dbg_kms(dev, "adding native format %p4cc\n", &fourcc);
+
+		*fourccs = fourcc;
+		++fourccs;
+	}
+
+	/*
+	 * The extra formats, emulated by the driver, go second.
+	 */
+
+	for (i = 0; (i < extra_nfourccs) && (fourccs < fourccs_end); ++i) {
+		u32 fourcc = extra_fourccs[i];
+
+		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
+			continue; /* skip duplicate and native entries */
+		} else if (fourccs == fourccs_end) {
+			drm_warn(dev, "Ignoring emulated format %p4cc\n", &fourcc);
+			continue; /* end of available output buffer */
+		}
+
+		drm_dbg_kms(dev, "adding emulated format %p4cc\n", &fourcc);
+
+		*fourccs = fourcc;
+		++fourccs;
+	}
+
+	return fourccs - fourccs_out;
+}
+EXPORT_SYMBOL(drm_sysfb_build_fourcc_list);
+
 int drm_sysfb_plane_helper_atomic_check(struct drm_plane *plane,
 					struct drm_atomic_state *new_state)
 {
diff --git a/drivers/gpu/drm/sysfb/efidrm.c b/drivers/gpu/drm/sysfb/efidrm.c
@@ -271,8 +271,8 @@ static struct efidrm_device *efidrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    efi->formats, ARRAY_SIZE(efi->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       efi->formats, ARRAY_SIZE(efi->formats));
 
 	primary_plane = &efi->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &efidrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/ofdrm.c b/drivers/gpu/drm/sysfb/ofdrm.c
@@ -15,7 +15,6 @@
 #include <drm/drm_drv.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_fbdev_shmem.h>
-#include <drm/drm_format_helper.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -1015,8 +1014,8 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    odev->formats, ARRAY_SIZE(odev->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       odev->formats, ARRAY_SIZE(odev->formats));
 
 	primary_plane = &odev->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &ofdrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/simpledrm.c b/drivers/gpu/drm/sysfb/simpledrm.c
@@ -18,7 +18,6 @@
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_shmem.h>
-#include <drm/drm_format_helper.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -765,8 +764,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    sdev->formats, ARRAY_SIZE(sdev->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       sdev->formats, ARRAY_SIZE(sdev->formats));
 
 	primary_plane = &sdev->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/vesadrm.c b/drivers/gpu/drm/sysfb/vesadrm.c
@@ -402,8 +402,8 @@ static struct vesadrm_device *vesadrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    vesa->formats, ARRAY_SIZE(vesa->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       vesa->formats, ARRAY_SIZE(vesa->formats));
 
 	primary_plane = &vesa->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &vesadrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c b/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
