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display: Map the framebuffer if it is not mapped

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iboot on Mac Studio (M1 Ultra) does not map the framebuffer("/vram")
for dcp and disp0.

Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2022-03-24 08:43:37 +01:00 committed by Hector Martin
parent 0104abbea7
commit 1b5dee2496
1 changed files with 82 additions and 0 deletions
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82
src/display.c
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: MIT */
#include "display.h"
#include "adt.h"
#include "assert.h"
#include "dcp.h"
#include "dcp_iboot.h"
@ -68,6 +69,84 @@ static void display_choose_color_mode(dcp_color_mode_t *modes, int cnt, dcp_colo
best->colorimetry, best->eotf, best->encoding, best->bpp);
}
static int display_map_fb(uintptr_t iova, void *paddr, size_t size)
{
int ret = dart_map(dcp->dart_disp, iova, paddr, size);
if (ret < 0) {
printf("display: failed to map fb to dart-disp0\n");
return -1;
}
ret = dart_map(dcp->dart_dcp, iova, paddr, size);
if (ret < 0) {
printf("display: failed to map fb to dart-dcp\n");
dart_unmap(dcp->dart_disp, iova, size);
return -1;
}
return 0;
}
static uintptr_t display_map_vram(void)
{
int ret = 0;
u64 paddr, size;
int adt_path[4];
int node = adt_path_offset_trace(adt, "/vram", adt_path);
if (node < 0) {
printf("display: '/vram' not found\n");
return 0;
}
int pp = 0;
while (adt_path[pp])
pp++;
adt_path[pp + 1] = 0;
ret = adt_get_reg(adt, adt_path, "reg", 0, &paddr, &size);
if (ret < 0) {
printf("display: failed to read /vram/reg\n");
return 0;
}
if (paddr != cur_boot_args.video.base) {
printf("display: vram does not match boot_args.video.base\n");
return 0;
}
s64 iova_disp0 = 0;
s64 iova_dcp = 0;
iova_dcp = dart_find_iova(dcp->dart_dcp, iova_dcp, size);
if (iova_dcp < 0) {
printf("display: failed to find IOVA for fb of %06zx bytes (dcp)\n", size);
return 0;
}
// try to map the fb to the same IOVA on disp0
iova_disp0 = dart_find_iova(dcp->dart_dcp, iova_dcp, size);
if (iova_disp0 < 0) {
printf("display: failed to find IOVA for fb of %06zx bytes (disp0)\n", size);
return 0;
}
// assume this results in the same IOVA, not sure if this is required but matches what iboot
// does on other models.
if (iova_disp0 != iova_dcp) {
printf("display: IOVA mismatch for fb between dcp (%08lx) and disp0 (%08lx)\n",
(u64)iova_dcp, (u64)iova_disp0);
return 0;
}
uintptr_t iova = iova_dcp;
ret = display_map_fb(iova, (void *)paddr, size);
if (ret < 0)
return 0;
return iova;
}
static int display_start_dcp(void)
{
if (iboot)
@ -81,6 +160,9 @@ static int display_start_dcp(void)
// Find the framebuffer DVA
fb_dva = dart_search(dcp->dart_disp, (void *)cur_boot_args.video.base);
// framebuffer is not mapped on the M1 Ultra Mac Studio
if (!fb_dva)
fb_dva = display_map_vram();
if (!fb_dva) {
printf("display: failed to find display DVA\n");
dcp_shutdown(dcp);