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backend/drm: set "max bpc" to the max

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"max bpc" is a maximum value, the driver is free to choose a
smaller value depending on the bandwidth available.

Some faulty monitors misbehave with higher bpc values. We'll add
a workaround if users get hit by these in practice.

References: https://gitlab.freedesktop.org/wayland/weston/-/issues/612
This commit is contained in:
Simon Ser 2022-06-07 15:03:39 +02:00 • committed by Isaac Freund
parent 1f1c0275be
commit 1d581656c7
5 changed files with 43 additions and 0 deletions
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27
backend/drm/properties.c
View file

@ -1,4 +1,5 @@
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@ -26,6 +27,7 @@ static const struct prop_info connector_info[] = {
{ "PATH", INDEX(path) },
{ "content type", INDEX(content_type) },
{ "link-status", INDEX(link_status) },
{ "max bpc", INDEX(max_bpc) },
{ "non-desktop", INDEX(non_desktop) },
{ "panel orientation", INDEX(panel_orientation) },
{ "subconnector", INDEX(subconnector) },
@ -181,3 +183,28 @@ char *get_drm_prop_enum(int fd, uint32_t obj, uint32_t prop_id) {
return str;
}
bool introspect_drm_prop_range(int fd, uint32_t prop_id,
uint64_t *min, uint64_t *max) {
drmModePropertyRes *prop = drmModeGetProperty(fd, prop_id);
if (!prop) {
return false;
}
if (drmModeGetPropertyType(prop) != DRM_MODE_PROP_RANGE) {
drmModeFreeProperty(prop);
return false;
}
assert(prop->count_values == 2);
if (min != NULL) {
*min = prop->values[0];
}
if (max != NULL) {
*max = prop->values[1];
}
drmModeFreeProperty(prop);
return true;
}