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-rw-r--r--src/lib/edid.c71
1 files changed, 70 insertions, 1 deletions
diff --git a/src/lib/edid.c b/src/lib/edid.c
index a794489aa0..c4c5e455a6 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -36,6 +36,8 @@
#include <string.h>
#include <stdlib.h>
#include <edid.h>
+#include <boot/coreboot_tables.h>
+#include <vbe.h>
static int claims_one_point_oh = 0;
static int claims_one_point_two = 0;
@@ -68,6 +70,9 @@ static int warning_zero_preferred_refresh = 0;
static int conformant = 1;
+static int vbe_valid;
+static struct lb_framebuffer edid_fb;
+
static char *manufacturer_name(struct edid *out, unsigned char *x)
{
out->manuf_name[0] = ((x[0] & 0x7C) >> 2) + '@';
@@ -1226,7 +1231,7 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
}
printk(BIOS_SPEW, "Checksum\n");
- do_checksum(edid);
+ vbe_valid = do_checksum(edid);
for(i = 0; i < size; i += 128)
nonconformant_extension = parse_extension(out, &edid[i]);
/*
@@ -1386,3 +1391,67 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
* SPWG also says something strange about the LSB of detailed descriptor 1:
* "LSB is set to "1" if panel is DE-timing only. H/V can be ignored."
*/
+/*
+ * Take an edid, and create a framebuffer. Set vbe_valid to 1.
+ */
+
+void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr);
+void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr)
+{
+ edid_fb.physical_address = fb_addr;
+ edid_fb.x_resolution = edid->ha;
+ edid_fb.y_resolution = edid->va;
+ /* In the case of (e.g.) 24bpp, 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->bpp;
+ switch(edid->bpp){
+ case 32:
+ case 24:
+ /* packed into 4-byte words */
+ edid_fb.bytes_per_line = edid->ha * 4;
+ 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.bytes_per_line = edid->ha * 2;
+ edid_fb.red_mask_pos = 12;
+ edid_fb.red_mask_size = 4;
+ edid_fb.green_mask_pos = 8;
+ edid_fb.green_mask_size = 4;
+ edid_fb.blue_mask_pos = 0;
+ edid_fb.blue_mask_size = 4;
+ break;
+ default:
+ printk(BIOS_SPEW, "%s: unsupported BPP %d\n", __func__,
+ edid->bpp);
+ return;
+ }
+
+ edid_fb.reserved_mask_pos = 0;
+ edid_fb.reserved_mask_size = 0;
+ vbe_valid = 1;
+}
+
+int vbe_mode_info_valid(void)
+{
+ return vbe_valid;
+}
+
+void fill_lb_framebuffer(struct lb_framebuffer *framebuffer)
+{
+ *framebuffer = edid_fb;
+}