From dafc45079dbabf7e7e9ec58785064cd1467854af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
Date: Wed, 29 Sep 2021 21:11:58 +0200
Subject: drm/format-helper: Add drm_fb_xrgb8888_to_rgb888()
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Git-commit: bcf80d6ef17c97ca7a712d8e6b065910b406e3c3
Patch-mainline: v5.16-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Add XRGB8888 emulation support for devices that can only do RGB888.
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/20210929191201.34456-4-noralf@tronnes.org
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/drm_format_helper.c | 38 +++++++++++++++++++++++++++++
include/drm/drm_format_helper.h | 2 ++
2 files changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index dab4f382d469..69fde60e36b3 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -300,6 +300,44 @@ static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf,
}
}
+/**
+ * drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
+ * @dst: RGB888 destination buffer
+ * @src: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ *
+ * Drivers can use this function for RGB888 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_rgb888(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_rgb888_line(dst, sbuf, width);
+ src += fb->pitches[0];
+ dst += width * 3;
+ }
+
+ kfree(sbuf);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
+
/**
* drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB565 destination buffer (iomem)
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index d0809aff5cf8..e86925cf07b9 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -24,6 +24,8 @@ void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip, bool swab);
+void drm_fb_xrgb8888_to_rgb888(void *dst, void *src, struct drm_framebuffer *fb,
+ struct drm_rect *clip);
void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
--
2.38.1