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kboot: Enable dart-disp0 as part of the display setup

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Devicetrees with dart-disp0 will have it disabled to avoid breaking
scanout off the boot framebuffer when booting via m1n1 version which
does not lock dart-disp0.

Signed-off-by: Janne Grunau <j@jannau.net>
This commit is contained in:
Janne Grunau 2022-11-13 21:45:56 +01:00 committed by Hector Martin
parent de0c0323a5
commit ba1dfab4d2
1 changed files with 32 additions and 0 deletions
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32
src/kboot.c
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@ -1,5 +1,7 @@
/* SPDX-License-Identifier: MIT */
#include <stdint.h>
#include "kboot.h"
#include "adt.h"
#include "assert.h"
@ -884,6 +886,22 @@ static int dt_set_atc_tunables(void)
return 0;
}
static int dt_get_iommu_node(int node, u32 num)
{
int len;
assert(num < 32);
const void *prop = fdt_getprop(dt, node, "iommus", &len);
if (!prop || len < 0 || (u32)len < 8 * (num + 1)) {
printf("FDT: unexpected 'iommus' prop / len %d\n", len);
return -FDT_ERR_NOTFOUND;
}
const fdt32_t *iommus = prop;
uint32_t phandle = fdt32_ld(&iommus[num * 2]);
return fdt_node_offset_by_phandle(dt, phandle);
}
static dart_dev_t *dt_init_dart_by_node(int node, u32 num)
{
int len;
@ -1118,6 +1136,20 @@ static int dt_carveout_reserved_regions(const char *dcp_alias, const char *disp_
}
}
/* enable dart-disp0, it is disabled in device tree to avoid resetting
* it and breaking display scanout when booting with old m1n1 which
* does not lock dart-disp0.
*/
if (disp_alias) {
int disp_node = fdt_path_offset(dt, disp_alias);
int dart_disp0 = dt_get_iommu_node(disp_node, 0);
if (dart_disp0 < 0)
bail_cleanup("DT: failed to find 'dart-disp0'\n");
if (fdt_setprop_string(dt, dart_disp0, "status", "okay") < 0)
bail_cleanup("DT: failed to enable 'dart-disp0'\n");
}
err:
if (dart_dcp)
dart_shutdown(dart_dcp);