diff options
Diffstat (limited to 'src/lib/edid_fill_fb.c')
| -rw-r--r-- | src/lib/edid_fill_fb.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/lib/edid_fill_fb.c b/src/lib/edid_fill_fb.c new file mode 100644 index 0000000000..210c727224 --- /dev/null +++ b/src/lib/edid_fill_fb.c @@ -0,0 +1,92 @@ +/* + * Copyright 2013 Google Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, and/or sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <console/console.h> +#include <edid.h> +#include <boot/coreboot_tables.h> + +static int fb_valid; +static struct lb_framebuffer edid_fb; + +/* + * Take an edid, and create a framebuffer. Set fb_valid to 1. + */ +void set_vbe_mode_info_valid(const struct edid *edid, uintptr_t fb_addr) +{ + edid_fb.physical_address = fb_addr; + edid_fb.x_resolution = edid->x_resolution; + edid_fb.y_resolution = edid->y_resolution; + edid_fb.bytes_per_line = edid->bytes_per_line; + /* In the case of (e.g.) 24 framebuffer bits per pixel, the convention + * nowadays seems to be to round it up to the nearest reasonable + * boundary, because otherwise the byte-packing is hideous. + * So, for example, in RGB with no alpha, the bytes are still + * packed into 32-bit words, the so-called 32bpp-no-alpha mode. + * Or, in 5:6:5 mode, the bytes are also packed into 32-bit words, + * and in 4:4:4 mode, they are packed into 16-bit words. + * Good call on the hardware guys part. + * It's not clear we're covering all cases here, but + * I'm not sure with grahpics you ever can. + */ + edid_fb.bits_per_pixel = edid->framebuffer_bits_per_pixel; + edid_fb.reserved_mask_pos = 0; + edid_fb.reserved_mask_size = 0; + switch (edid->framebuffer_bits_per_pixel) { + case 32: + case 24: + /* packed into 4-byte words */ + edid_fb.reserved_mask_pos = 24; + edid_fb.reserved_mask_size = 8; + edid_fb.red_mask_pos = 16; + edid_fb.red_mask_size = 8; + edid_fb.green_mask_pos = 8; + edid_fb.green_mask_size = 8; + edid_fb.blue_mask_pos = 0; + edid_fb.blue_mask_size = 8; + break; + case 16: + /* packed into 2-byte words */ + edid_fb.red_mask_pos = 11; + edid_fb.red_mask_size = 5; + edid_fb.green_mask_pos = 5; + edid_fb.green_mask_size = 6; + edid_fb.blue_mask_pos = 0; + edid_fb.blue_mask_size = 5; + break; + default: + printk(BIOS_SPEW, "%s: unsupported BPP %d\n", __func__, + edid->framebuffer_bits_per_pixel); + return; + } + + fb_valid = 1; +} + +int fill_lb_framebuffer(struct lb_framebuffer *framebuffer) +{ + if (!fb_valid) + return -1; + + *framebuffer = edid_fb; + + return 0; +} |