Test the vesa_attributes field in struct screen_info for compatibility with VGA hardware. Vesafb currently tests bit 1 in screen_info's capabilities field, It sets the framebuffer address size and is unrelated to VGA.
Section 4.4 of the Vesa VBE 2.0 specifications defines that bit 5 in the mode's attributes field signals VGA compatibility. The mode is compatible with VGA hardware if the bit is clear. In that case, the driver can access VGA state of the VBE's underlying hardware. The vesafb driver uses this feature to program the color LUT in palette modes. Without, colors might be incorrect.
The problem got introduced in commit 89ec4c238e7a ("[PATCH] vesafb: Fix incorrect logo colors in x86_64"). It incorrectly stores the mode attributes in the screen_info's capabilities field and updates vesafb accordingly. Later, commit 5e8ddcbe8692 ("Video mode probing support for the new x86 setup code") fixed the screen_info, but did not update vesafb. Color output still tends to work, because bit 1 in capabilities is usually 0.
Besides fixing the bug in vesafb, this commit introduces a helper that reads the correct bit from screen_info.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: 5e8ddcbe8692 ("Video mode probing support for the new x86 setup code") Cc: stable@vger.kernel.org # v2.6.23+ --- drivers/video/fbdev/vesafb.c | 2 +- include/linux/screen_info.h | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c index 8ab64ae4cad3e..5a161750a3aee 100644 --- a/drivers/video/fbdev/vesafb.c +++ b/drivers/video/fbdev/vesafb.c @@ -271,7 +271,7 @@ static int vesafb_probe(struct platform_device *dev) if (si->orig_video_isVGA != VIDEO_TYPE_VLFB) return -ENODEV;
- vga_compat = (si->capabilities & 2) ? 0 : 1; + vga_compat = !__screen_info_vbe_mode_nonvga(si); vesafb_fix.smem_start = si->lfb_base; vesafb_defined.bits_per_pixel = si->lfb_depth; if (15 == vesafb_defined.bits_per_pixel) diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h index 75303c126285a..95f2a339de329 100644 --- a/include/linux/screen_info.h +++ b/include/linux/screen_info.h @@ -49,6 +49,11 @@ static inline u64 __screen_info_lfb_size(const struct screen_info *si, unsigned return lfb_size; }
+static inline bool __screen_info_vbe_mode_nonvga(const struct screen_info *si) +{ + return si->vesa_attributes & BIT(5); // VGA if _not_ set +} + static inline unsigned int __screen_info_video_type(unsigned int type) { switch (type) {