diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/fbdev/efifb.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index fa01eecc0a55..52bf39f93888 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -111,6 +111,46 @@ static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si) } } +#ifdef CONFIG_X86 +/* + * On x86 some firmwares use a low non native resolution for the display when + * they have shown some text messages. While keeping the bgrt filled with info + * for the native resolution. If the bgrt image intended for the native + * resolution still fits, it will be displayed very close to the right edge of + * the display looking quite bad. This function checks for this. + */ +static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width) +{ + static const int default_resolutions[][2] = { + { 800, 600 }, + { 1024, 768 }, + { 1280, 1024 }, + }; + u32 i, right_margin; + + for (i = 0; i < ARRAY_SIZE(default_resolutions); i++) { + if (default_resolutions[i][0] == si->lfb_width && + default_resolutions[i][1] == si->lfb_height) + break; + } + /* If not a default resolution used for textmode, this should be fine */ + if (i >= ARRAY_SIZE(default_resolutions)) + return true; + + /* If the right margin is 5 times smaller then the left one, reject */ + right_margin = si->lfb_width - (bgrt_tab.image_offset_x + bmp_width); + if (right_margin < (bgrt_tab.image_offset_x / 5)) + return false; + + return true; +} +#else +static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width) +{ + return true; +} +#endif + static void efifb_show_boot_graphics(struct fb_info *info) { u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y; @@ -169,6 +209,9 @@ static void efifb_show_boot_graphics(struct fb_info *info) (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height) goto error; + if (!efifb_bgrt_sanity_check(si, bmp_width)) + goto error; + pr_info("efifb: showing boot graphics\n"); for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) { |