From cee0b7cbf1c02fc1e32a9eda6a66f1a4f85adae9 Mon Sep 17 00:00:00 2001 From: Noralf Trønnes Date: Wed, 29 Sep 2021 21:11:57 +0200 Subject: drm/format-helper: Add drm_fb_xrgb8888_to_rgb332() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add XRGB8888 emulation support for devices that can only do RGB332. v2: - Support Big Endian (Daniel) Reviewed-by: Daniel Vetter Acked-by: Thomas Zimmermann Signed-off-by: Noralf Trønnes Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-3-noralf@tronnes.org --- drivers/gpu/drm/drm_format_helper.c | 50 +++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) (limited to 'drivers/gpu/drm/drm_format_helper.c') diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 5231104b1498..dab4f382d469 100644 --- 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) -- cgit From bcf80d6ef17c97ca7a712d8e6b065910b406e3c3 Mon Sep 17 00:00:00 2001 From: Noralf Trønnes Date: Wed, 29 Sep 2021 21:11:58 +0200 Subject: drm/format-helper: Add drm_fb_xrgb8888_to_rgb888() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add XRGB8888 emulation support for devices that can only do RGB888. Reviewed-by: Daniel Vetter Acked-by: Thomas Zimmermann Signed-off-by: Noralf Trønnes Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-4-noralf@tronnes.org --- drivers/gpu/drm/drm_format_helper.c | 38 +++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'drivers/gpu/drm/drm_format_helper.c') 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) -- cgit