drm/sysfb: Generalize pixel-format matching

Provide drm_sysfb_get_format(), a helper that finds a specific DRM
format from a list of pixel formats. The new function builds upon
drm_sysfb_get_format_si(), which finds the DRM format from a given
instance of struct screen_info. Now get the screen_info's pixel format
in the caller. Allows for matching pixel formats in drivers without
screen_info.

Convert the callers in efidrm and vesadrm to the new interface.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Julius Werner <jwerner@chromium.org>
Link: https://patch.msgid.link/20260217155836.96267-11-tzimmermann@suse.de

5 files changed, 42 insertions, 36 deletions

diff --git a/drivers/gpu/drm/sysfb/drm_sysfb.c b/drivers/gpu/drm/sysfb/drm_sysfb.c
index 308f82153b15..fbfb37d0fae1 100644
--- a/drivers/gpu/drm/sysfb/drm_sysfb.c
+++ b/drivers/gpu/drm/sysfb/drm_sysfb.c
@@ -31,5 +31,29 @@ int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
 }
 EXPORT_SYMBOL(drm_sysfb_get_validated_int0);
 
+const struct drm_format_info *drm_sysfb_get_format(struct drm_device *dev,
+						   const struct drm_sysfb_format *formats,
+						   size_t nformats,
+						   const struct pixel_format *pixel)
+{
+	const struct drm_format_info *format = NULL;
+	size_t i;
+
+	for (i = 0; i < nformats; ++i) {
+		const struct drm_sysfb_format *f = &formats[i];
+
+		if (pixel_format_equal(pixel, &f->pixel)) {
+			format = drm_format_info(f->fourcc);
+			break;
+		}
+	}
+
+	if (!format)
+		drm_warn(dev, "No compatible color format found\n");
+
+	return format;
+}
+EXPORT_SYMBOL(drm_sysfb_get_format);
+
 MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
 MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_helper.h b/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
index de96bfe7562c..b14df5b54bc9 100644
--- a/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
+++ b/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
@@ -36,6 +36,10 @@ int drm_sysfb_get_validated_int(struct drm_device *dev, const char *name,
 				u64 value, u32 max);
 int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
 				 u64 value, u32 max);
+const struct drm_format_info *drm_sysfb_get_format(struct drm_device *dev,
+						   const struct drm_sysfb_format *formats,
+						   size_t nformats,
+						   const struct pixel_format *pixel);
 
 #if defined(CONFIG_SCREEN_INFO)
 int drm_sysfb_get_width_si(struct drm_device *dev, const struct screen_info *si);
@@ -48,10 +52,6 @@ int drm_sysfb_get_stride_si(struct drm_device *dev, const struct screen_info *si
 			    unsigned int width, unsigned int height, u64 size);
 u64 drm_sysfb_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
 				  unsigned int height, unsigned int stride, u64 size);
-const struct drm_format_info *drm_sysfb_get_format_si(struct drm_device *dev,
-						      const struct drm_sysfb_format *formats,
-						      size_t nformats,
-						      const struct screen_info *si);
 #endif
 
 /*
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c b/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c
index 885864168c54..749290196c6a 100644
--- a/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c
+++ b/drivers/gpu/drm/sysfb/drm_sysfb_screen_info.c
@@ -72,33 +72,3 @@ u64 drm_sysfb_get_visible_size_si(struct drm_device *dev, const struct screen_in
 	return drm_sysfb_get_validated_size0(dev, "visible size", vsize, size);
 }
 EXPORT_SYMBOL(drm_sysfb_get_visible_size_si);
-
-const struct drm_format_info *drm_sysfb_get_format_si(struct drm_device *dev,
-						      const struct drm_sysfb_format *formats,
-						      size_t nformats,
-						      const struct screen_info *si)
-{
-	const struct drm_format_info *format = NULL;
-	struct pixel_format pixel;
-	size_t i;
-	int ret;
-
-	ret = screen_info_pixel_format(si, &pixel);
-	if (ret)
-		return NULL;
-
-	for (i = 0; i < nformats; ++i) {
-		const struct drm_sysfb_format *f = &formats[i];
-
-		if (pixel_format_equal(&pixel, &f->pixel)) {
-			format = drm_format_info(f->fourcc);
-			break;
-		}
-	}
-
-	if (!format)
-		drm_warn(dev, "No compatible color format found\n");
-
-	return format;
-}
-EXPORT_SYMBOL(drm_sysfb_get_format_si);
diff --git a/drivers/gpu/drm/sysfb/efidrm.c b/drivers/gpu/drm/sysfb/efidrm.c
index 1b683d55d6ea..ee525f330441 100644
--- a/drivers/gpu/drm/sysfb/efidrm.c
+++ b/drivers/gpu/drm/sysfb/efidrm.c
@@ -45,8 +45,14 @@ static const struct drm_format_info *efidrm_get_format_si(struct drm_device *dev
 		{ PIXEL_FORMAT_XBGR8888, DRM_FORMAT_XBGR8888, },
 		{ PIXEL_FORMAT_XRGB2101010, DRM_FORMAT_XRGB2101010, },
 	};
+	struct pixel_format pixel;
+	int ret;
+
+	ret = screen_info_pixel_format(si, &pixel);
+	if (ret)
+		return NULL;
 
-	return drm_sysfb_get_format_si(dev, formats, ARRAY_SIZE(formats), si);
+	return drm_sysfb_get_format(dev, formats, ARRAY_SIZE(formats), &pixel);
 }
 
 static u64 efidrm_get_mem_flags(struct drm_device *dev, resource_size_t start,
diff --git a/drivers/gpu/drm/sysfb/vesadrm.c b/drivers/gpu/drm/sysfb/vesadrm.c
index 7b7b5ba26317..b8c16ae3faad 100644
--- a/drivers/gpu/drm/sysfb/vesadrm.c
+++ b/drivers/gpu/drm/sysfb/vesadrm.c
@@ -49,8 +49,14 @@ static const struct drm_format_info *vesadrm_get_format_si(struct drm_device *de
 		{ PIXEL_FORMAT_XBGR8888, DRM_FORMAT_XBGR8888, },
 		{ PIXEL_FORMAT_C8, DRM_FORMAT_C8, },
 	};
+	struct pixel_format pixel;
+	int ret;
+
+	ret = screen_info_pixel_format(si, &pixel);
+	if (ret)
+		return NULL;
 
-	return drm_sysfb_get_format_si(dev, formats, ARRAY_SIZE(formats), si);
+	return drm_sysfb_get_format(dev, formats, ARRAY_SIZE(formats), &pixel);
 }
 
 /*