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wsi/display: Add some comments about what's going on in the code.

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6173>
This commit is contained in:
Emma Anholt
2025-07-02 13:42:24 -07:00
committed by Marge Bot
parent 513ffea1d3
commit 3c302d29a4
1 changed files with 18 additions and 1 deletions
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19
src/vulkan/wsi/wsi_common_display.c
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@@ -152,7 +152,10 @@ struct wsi_display {
struct list_head connectors; /* list of all discovered connectors */
};
/**
* Creates the mapping from our property enums to the KMS property ID for that
* property associated with the object.
*/
static bool
find_properties(struct wsi_display_connector *connector, int fd, uint32_t type)
{
@@ -185,12 +188,18 @@ find_properties(struct wsi_display_connector *connector, int fd, uint32_t type)
memset(prop_id, 0, prop_count * sizeof(*prop_id));
/* Mark these properties as optional, causing them to be skipped in the
* verification at the bottom.
*/
if (type == DRM_MODE_OBJECT_CRTC) {
prop_id[GAMMA_LUT] = -1;
prop_id[DEGAMMA_LUT] = -1;
prop_id[CTM] = -1;
}
/* Walk the list of properties seeing if their names match one of the
* properties we care about controlling.
*/
for (int p = 0; p < props->count_props; p++) {
drmModePropertyPtr prop = drmModeGetProperty(fd, props->props[p]);
if (!prop)
@@ -2155,12 +2164,20 @@ drm_atomic_commit(wsi_display_connector *connector, struct wsi_display_image *im
return -1;
if (!connector->active) {
/* Do the initial setup of the display when we're first taking control of
* it, or after a mode change was requested.
*/
if (drmModeCreatePropertyBlob(fd, mode, sizeof(*mode), &blob_id) != 0)
return -1;
drmModeAtomicAddProperty(req, connector->id, connector->property[CRTC_ID], crtc_id);
drmModeAtomicAddProperty(req, crtc_id, connector->crtc_property[MODE_ID], blob_id);
drmModeAtomicAddProperty(req, crtc_id, connector->crtc_property[ACTIVE], 1);
/* Disable any color transforms that may have been previously set on the
* CRTC by another user.
*/
if (connector->crtc_property[GAMMA_LUT] != -1)
drmModeAtomicAddProperty(req, crtc_id, connector->crtc_property[GAMMA_LUT], 0);
if (connector->crtc_property[DEGAMMA_LUT] != -1)