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backend-drm: store EDID data

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Store the EDID data as-is, so that we can tell when the EDID blob has
changed. This is not too useful yet, because all the weston_head_set_*()
API raises the device_changed flag only if the information actually
changes. However, I want to expose the libdisplay-info di_info structure
through weston_head, and those cannot be (as) easily compared.

We need to know when the EDID blob changes, so we can call
weston_head_set_device_changed() appropriately when updating di_info.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2023-08-31 13:58:17 +03:00
parent 4a028ade32
commit 2c0a9c064a
3 changed files with 43 additions and 19 deletions
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3
libweston/backend-drm/drm-internal.h
View file

@ -616,6 +616,9 @@ struct drm_head {
/* drm_output::disable_head */
struct wl_list disable_head_link;
void *display_data; /**< EDID or DisplayID blob */
size_t display_data_len; /**< bytes */
};
struct drm_crtc {

1
libweston/backend-drm/drm.c
View file

@ -2704,6 +2704,7 @@ drm_head_destroy(struct weston_head *base)
if (head->backlight)
backlight_destroy(head->backlight);
free(head->display_data);
free(head);
}

58
libweston/backend-drm/modes.c
View file

@ -384,37 +384,55 @@ drm_head_info_from_edid(struct drm_head_info *dhi,
#endif /* HAVE_LIBDISPLAY_INFO else */
/** Parse monitor make, model and serial from EDID
*
* \param head The head whose \c drm_edid to fill in.
* \param props The DRM connector properties to get the EDID from.
* \param[out] dhi Receives information from EDID.
*
* \c *dhi must be drm_head_info_fini()'d by the caller.
*/
static void
find_and_parse_output_edid(struct drm_head *head,
drmModeObjectPropertiesPtr props,
struct drm_head_info *dhi)
drm_head_set_display_data(struct drm_head *head, const void *data, size_t len)
{
free(head->display_data);
if (!data || len == 0) {
head->display_data = NULL;
head->display_data_len = 0;
return;
}
head->display_data = xmalloc(len);
head->display_data_len = len;
memcpy(head->display_data, data, len);
}
static bool
drm_head_maybe_update_display_data(struct drm_head *head,
drmModeObjectPropertiesPtr props)
{
struct drm_device *device = head->connector.device;
drmModePropertyBlobPtr edid_blob = NULL;
uint32_t blob_id;
bool changed = false;
blob_id =
drm_property_get_value(
&head->connector.props[WDRM_CONNECTOR_EDID],
props, 0);
if (!blob_id)
return;
if (blob_id)
edid_blob = drmModeGetPropertyBlob(device->drm.fd, blob_id);
edid_blob = drmModeGetPropertyBlob(device->drm.fd, blob_id);
if (!edid_blob)
return;
drm_head_info_from_edid(dhi, edid_blob->data, edid_blob->length);
if (edid_blob && edid_blob->length > 0) {
if (!head->display_data ||
head->display_data_len != edid_blob->length ||
memcmp(head->display_data, edid_blob->data, edid_blob->length)) {
drm_head_set_display_data(head, edid_blob->data, edid_blob->length);
changed = true;
}
} else {
if (head->display_data) {
drm_head_set_display_data(head, NULL, 0);
changed = true;
}
}
drmModeFreePropertyBlob(edid_blob);
return changed;
}
static void
@ -597,7 +615,9 @@ update_head_from_connector(struct drm_head *head)
drmModeConnector *conn = connector->conn;
struct drm_head_info dhi = { .eotf_mask = WESTON_EOTF_MODE_SDR };
find_and_parse_output_edid(head, props, &dhi);
drm_head_maybe_update_display_data(head, props);
drm_head_info_from_edid(&dhi, head->display_data, head->display_data_len);
weston_head_set_monitor_strings(&head->base, dhi.make,
dhi.model,