Not all possible format conversions are supported yet. Print a warning on unsupported combinations.

Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Javier Martinez Canillas javierm@redhat.com --- drivers/gpu/drm/drm_format_helper.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 0e7135114728..b648f29b21b6 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -590,6 +590,9 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for } }

+ drm_warn_once(fb->dev, "No conversion helper from %p4cc to %p4cc found.\n", + &fb_format, &dst_format); + return -EINVAL; } EXPORT_SYMBOL(drm_fb_blit_toio);

Add a format helper that converts RGB565 to XRGB8888. Use this function in drm_fb_blit_toio(). Fixes simpledrm output for this combination of formats.

UEFI and/or Grub will usually set 32-bit output in XRGB8888 format. The issue can be reproduced by enabling simpledrm and requesting a console framebuffer of different format on the kernel command line; for example

nomodeset video=1024x768-16

In this case, conversion helpers will display nothing on the console. The patch makes this work by implementing the rsp conversion helpers. It also enables odd userspace configurations, such as running Xorg with 16-bit color depth on a 32-bit output buffer.

v2: * use helpers for struct drm_rect (Javier) * improve commit message (Javier)

Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Javier Martinez Canillas javierm@redhat.com --- drivers/gpu/drm/drm_format_helper.c | 46 +++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index c83e0bb2e8c7..34b7ef443ad2 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -411,6 +411,49 @@ void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch, } EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_toio);

+static void drm_fb_rgb565_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels) +{ + u32 *dbuf32 = dbuf; + const u16 *sbuf16 = sbuf; + unsigned int x; + + for (x = 0; x < pixels; x++, ++sbuf16, ++dbuf32) { + u32 val32 = ((*sbuf16 & 0xf800) << 8) | + ((*sbuf16 & 0x07e0) << 5) | + ((*sbuf16 & 0x001f) << 3); + *dbuf32 = 0xff000000 | val32 | + ((val32 >> 3) & 0x00070007) | + ((val32 >> 2) & 0x00000300); + } +} + +static void drm_fb_rgb565_to_xrgb8888_toio(void __iomem *dst, unsigned int dst_pitch, + const void *vaddr, const struct drm_framebuffer *fb, + const struct drm_rect *clip) +{ + size_t linepixels = drm_rect_width(clip); + size_t dst_len = linepixels * 4; + unsigned int y, lines = drm_rect_height(clip); + void *dbuf; + + if (!dst_pitch) + dst_pitch = dst_len; + + dbuf = kmalloc(dst_len, GFP_KERNEL); + if (!dbuf) + return; + + vaddr += clip_offset(clip, fb->pitches[0], 2); + for (y = 0; y < lines; y++) { + drm_fb_rgb565_to_xrgb8888_line(dbuf, vaddr, linepixels); + memcpy_toio(dst, dbuf, dst_len); + vaddr += fb->pitches[0]; + dst += dst_pitch; + } + + kfree(dbuf); +} + static void drm_fb_rgb888_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels) { u32 *dbuf32 = dbuf; @@ -628,6 +671,9 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_for if (fb_format == DRM_FORMAT_RGB888) { drm_fb_rgb888_to_xrgb8888_toio(dst, dst_pitch, vmap, fb, clip); return 0; + } else if (fb_format == DRM_FORMAT_RGB565) { + drm_fb_rgb565_to_xrgb8888_toio(dst, dst_pitch, vmap, fb, clip); + return 0; } } else if (dst_format == DRM_FORMAT_XRGB2101010) { if (fb_format == DRM_FORMAT_XRGB8888) {