xref: /OK3568_Linux_fs/buildroot/package/weston/0063-backend-drm-Stop-disabling-unused-CRTCs-by-default.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From 5c30b9d79ca60fe260d86264c4ca4a579fd5def1 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Wed, 27 Apr 2022 15:17:39 +0800
Subject: [PATCH 63/95] backend-drm: Stop disabling unused CRTCs by default

So that we can launch multiple weston instances for different monitors.

Set env "WESTON_DRM_MASTER" to take charge of all CRTCs again.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 libweston/backend-drm/drm-internal.h | 1 +
 libweston/backend-drm/drm.c          | 8 ++++++++
 libweston/backend-drm/kms.c          | 7 ++++---
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/libweston/backend-drm/drm-internal.h b/libweston/backend-drm/drm-internal.h
index b7deeb0..46edbc6 100644
--- a/libweston/backend-drm/drm-internal.h
+++ b/libweston/backend-drm/drm-internal.h
@@ -356,6 +356,7 @@ struct drm_backend {
 	int64_t last_resize_ms;
 	int64_t resize_freeze_ms;

+	bool master;
 	bool single_head;
 	bool head_fallback;
 	bool head_fallback_all;
diff --git a/libweston/backend-drm/drm.c b/libweston/backend-drm/drm.c
index cb40715..05ae2c1 100644
--- a/libweston/backend-drm/drm.c
+++ b/libweston/backend-drm/drm.c
@@ -2333,6 +2333,10 @@ drm_output_detach_crtc(struct drm_output *output)

 	crtc->output = NULL;
 	output->crtc = NULL;
+
+	/* HACK: Do it here rather than in the kms.c for drm-master config */
+	drmModeSetCrtc(crtc->device->drm.fd,
+		       crtc->crtc_id, 0, 0, 0, NULL, 0, NULL);
 }

 static int
@@ -4257,6 +4261,10 @@ drm_backend_create(struct weston_compositor *compositor,
 	if (b == NULL)
 		return NULL;

+	buf = getenv("WESTON_DRM_MASTER");
+	if (buf && buf[0] == '1')
+		b->master = true;
+
 	buf = getenv("WESTON_DRM_SINGLE_HEAD");
 	if (buf && buf[0] == '1')
 		b->single_head = true;
diff --git a/libweston/backend-drm/kms.c b/libweston/backend-drm/kms.c
index 607bf70..38ecf68 100644
--- a/libweston/backend-drm/kms.c
+++ b/libweston/backend-drm/kms.c
@@ -1217,7 +1217,7 @@ drm_pending_state_apply_atomic(struct drm_pending_state *pending_state,
 		break;
 	}

-	if (device->state_invalid) {
+	if (device->state_invalid && b->master) {
 		struct weston_head *head_base;
 		struct drm_head *head;
 		struct drm_crtc *crtc;
@@ -1417,7 +1417,7 @@ drm_pending_state_apply(struct drm_pending_state *pending_state)
 		return drm_pending_state_apply_atomic(pending_state,
 						      DRM_STATE_APPLY_ASYNC);

-	if (device->state_invalid) {
+	if (device->state_invalid && b->master) {
 		/* If we need to reset all our state (e.g. because we've
 		 * just started, or just been VT-switched in), explicitly
 		 * disable all the CRTCs we aren't using. This also disables
@@ -1476,6 +1476,7 @@ int
 drm_pending_state_apply_sync(struct drm_pending_state *pending_state)
 {
 	struct drm_device *device = pending_state->device;
+	struct drm_backend *b = device->backend;
 	struct drm_output_state *output_state, *tmp;
 	struct drm_crtc *crtc;
 	int has_error = 0;
@@ -1484,7 +1485,7 @@ drm_pending_state_apply_sync(struct drm_pending_state *pending_state)
 		return drm_pending_state_apply_atomic(pending_state,
 						      DRM_STATE_APPLY_SYNC);

-	if (device->state_invalid) {
+	if (device->state_invalid && b->master) {
 		/* If we need to reset all our state (e.g. because we've
 		 * just started, or just been VT-switched in), explicitly
 		 * disable all the CRTCs we aren't using. This also disables
--
2.20.1