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kboot: reserve framebuffer from "/vram"

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Fixes dcp if m1n1 reallocated the framebuffer due to large boot display
resolution. In that case we update "/vram" but leave the carveout
unmodified.

Use "framebuffer" as compatible string as proposed in
https://lore.kernel.org/dri-devel/20221117184039.2291937-4-thierry.reding@gmail.com/

Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2022-12-22 15:45:12 +01:00 committed by Hector Martin
parent d73f53d9a0
commit fe38315f1c
1 changed files with 36 additions and 7 deletions
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43
src/kboot.c
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@ -1251,11 +1251,42 @@ static int dt_carveout_reserved_regions(const char *dcp_alias, const char *disp_
region, num_maps);
}
static struct disp_mapping disp_reserved_regions_vram[] = {
// boot framebuffer, mapped to dart-disp0 sid 0 and dart-dcp sid 0/5
{"vram", "framebuffer", true, true, false},
};
static int dt_vram_reserved_region(const char *dcp_alias, const char *disp_alias)
{
int ret = 0;
int adt_path[4];
struct mem_region region;
// return early if dcp_alias does not exists
if (!fdt_get_alias(dt, dcp_alias))
return 0;
int node = adt_path_offset_trace(adt, "/vram", adt_path);
if (node < 0)
bail("ADT: '/vram' not found\n");
int pp = 0;
while (adt_path[pp])
pp++;
adt_path[pp + 1] = 0;
ret = adt_get_reg(adt, adt_path, "reg", 0, &region.paddr, &region.size);
if (ret < 0)
bail("ADT: failed to read /vram/reg\n");
return dt_add_reserved_regions(dcp_alias, disp_alias, NULL, "framebuffer",
disp_reserved_regions_vram, &region, 1);
}
static struct disp_mapping disp_reserved_regions_t8103[] = {
{"region-id-50", "dcp_data", true, false, false},
{"region-id-57", "region57", true, false, false},
// boot framebuffer, mapped to dart-disp0 sid 0 and dart-dcp sid 0
{"region-id-14", "vram", true, true, false},
// The 2 following regions are mapped in dart-dcp sid 0 and dart-disp0 sid 0 and 4
{"region-id-94", "region94", true, true, false},
{"region-id-95", "region95", true, false, true},
@ -1270,8 +1301,6 @@ static struct disp_mapping disp_reserved_regions_t8112[] = {
{"region-id-49", "dcp_txt", true, false, false},
{"region-id-50", "dcp_data", true, false, false},
{"region-id-57", "region57", true, false, false},
// boot framebuffer, mapped to dart-disp0 sid 0 and dart-dcp sid 5
{"region-id-14", "vram", true, true, false},
// The 2 following regions are mapped in dart-dcp sid 5 and dart-disp0 sid 0 and 4
{"region-id-94", "region94", true, true, false},
{"region-id-95", "region95", true, false, true},
@ -1286,8 +1315,6 @@ static struct disp_mapping dcpext_reserved_regions_t8112[] = {
static struct disp_mapping disp_reserved_regions_t600x[] = {
{"region-id-50", "dcp_data", true, false, false},
{"region-id-57", "region57", true, false, false},
// boot framebuffer, mapped to dart-disp0 sid 0 and dart-dcp sid 0
{"region-id-14", "vram", true, true, false},
// The 2 following regions are mapped in dart-dcp sid 0 and dart-disp0 sid 0 and 4
{"region-id-94", "region94", true, true, false},
{"region-id-95", "region95", true, false, true},
@ -1387,8 +1414,10 @@ static int dt_set_display(void)
printf("DT: unknown compatible, skip display reserved-memory setup\n");
return 0;
}
if (ret)
return ret;
return dt_vram_reserved_region("dcp", "disp0");
}
static int dt_disable_missing_devs(const char *adt_prefix, const char *dt_prefix, int max_devs)