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kboot: Hide the notch

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-02-22 00:54:52 +09:00
parent 5531b9ae32
commit 287a963bcc
1 changed files with 40 additions and 3 deletions
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43
src/kboot.c
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@ -36,6 +36,42 @@ static size_t initrd_size = 0;
goto err; \
} while (0)
void get_notchless_fb(u64 *fb_base, u64 *fb_height)
{
*fb_base = cur_boot_args.video.base;
*fb_height = cur_boot_args.video.height;
int node = adt_path_offset(adt, "/product");
if (node < 0) {
printf("FDT: /product node not found\n");
return;
}
u32 val;
if (ADT_GETPROP(adt, node, "partially-occluded-display", &val) < 0 || !val) {
printf("FDT: No notch detected\n");
return;
}
u64 hfrac = cur_boot_args.video.height * 16 / cur_boot_args.video.width;
u64 new_height = cur_boot_args.video.width * hfrac / 16;
if (new_height == cur_boot_args.video.height) {
printf("FDT: Notch detected, but display aspect is already 16:%lu?\n", hfrac);
return;
}
u64 offset = cur_boot_args.video.height - new_height;
printf("display: Hiding notch, %lux%lu -> %lux%lu (+%lu, 16:%lu)\n", cur_boot_args.video.width,
cur_boot_args.video.height, cur_boot_args.video.width, new_height, offset, hfrac);
*fb_base += cur_boot_args.video.stride * offset;
*fb_height = new_height;
}
static int dt_set_chosen(void)
{
@ -69,8 +105,9 @@ static int dt_set_chosen(void)
if (fb < 0)
bail("FDT: /chosen node not found in devtree\n");
u64 fb_base = cur_boot_args.video.base;
u64 fb_size = cur_boot_args.video.stride * cur_boot_args.video.height;
u64 fb_base, fb_height;
get_notchless_fb(&fb_base, &fb_height);
u64 fb_size = cur_boot_args.video.stride * fb_height;
u64 fbreg[2] = {cpu_to_fdt64(fb_base), cpu_to_fdt64(fb_size)};
char fbname[32];
@ -85,7 +122,7 @@ static int dt_set_chosen(void)
if (fdt_setprop_u32(dt, fb, "width", cur_boot_args.video.width))
bail("FDT: couldn't set framebuffer width\n");
if (fdt_setprop_u32(dt, fb, "height", cur_boot_args.video.height))
if (fdt_setprop_u32(dt, fb, "height", fb_height))
bail("FDT: couldn't set framebuffer height\n");
if (fdt_setprop_u32(dt, fb, "stride", cur_boot_args.video.stride))