Factor out amdgpu_prime_dirty_to_crtc helper

Cleanup in preparation for the following change, no functional change
intended.

(Ported from radeon commit 649644a88347a6d03de68f8c41db03a82deeb23b)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 33 insertions, 29 deletions

diff --git a/src/amdgpu_kms.c b/src/amdgpu_kms.c
index b2d098a..10a68fb 100644
--- a/src/amdgpu_kms.c
+++ b/src/amdgpu_kms.c
@@ -549,6 +549,27 @@ call_sync_shared_pixmap(PixmapDirtyUpdatePtr dirty)
 #endif /* HAS_SYNC_SHARED_PIXMAPS */
 
 
+static xf86CrtcPtr
+amdgpu_prime_dirty_to_crtc(PixmapDirtyUpdatePtr dirty)
+{
+	ScreenPtr screen = dirty->slave_dst->drawable.pScreen;
+	ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
+	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
+	int c;
+
+	/* Find the CRTC which is scanning out from this slave pixmap */
+	for (c = 0; c < xf86_config->num_crtc; c++) {
+		xf86CrtcPtr xf86_crtc = xf86_config->crtc[c];
+		drmmode_crtc_private_ptr drmmode_crtc = xf86_crtc->driver_private;
+
+		if (drmmode_crtc->scanout[0].pixmap == dirty->slave_dst ||
+			drmmode_crtc->scanout[1].pixmap == dirty->slave_dst)
+			return xf86_crtc;
+	}
+
+	return NULL;
+}
+
 static Bool
 amdgpu_prime_scanout_do_update(xf86CrtcPtr crtc, unsigned scanout_id)
 {
@@ -608,24 +629,16 @@ amdgpu_prime_scanout_update(PixmapDirtyUpdatePtr dirty)
 	ScreenPtr screen = dirty->slave_dst->drawable.pScreen;
 	ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
 	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(scrn);
-	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
-	xf86CrtcPtr xf86_crtc = NULL;
-	drmmode_crtc_private_ptr drmmode_crtc = NULL;
+	xf86CrtcPtr xf86_crtc = amdgpu_prime_dirty_to_crtc(dirty);
+	drmmode_crtc_private_ptr drmmode_crtc;
 	uintptr_t drm_queue_seq;
 	drmVBlank vbl;
-	int c;
 
-	/* Find the CRTC which is scanning out from this slave pixmap */
-	for (c = 0; c < xf86_config->num_crtc; c++) {
-		xf86_crtc = xf86_config->crtc[c];
-		drmmode_crtc = xf86_crtc->driver_private;
-		if (drmmode_crtc->scanout[0].pixmap == dirty->slave_dst)
-			break;
-	}
+	if (!xf86_crtc || !xf86_crtc->enabled)
+		return;
 
-	if (c == xf86_config->num_crtc ||
-	    !xf86_crtc->enabled ||
-	    drmmode_crtc->scanout_update_pending ||
+	drmmode_crtc = xf86_crtc->driver_private;
+	if (drmmode_crtc->scanout_update_pending ||
 	    !drmmode_crtc->scanout[0].pixmap ||
 	    drmmode_crtc->pending_dpms_mode != DPMSModeOn)
 		return;
@@ -671,25 +684,16 @@ amdgpu_prime_scanout_flip(PixmapDirtyUpdatePtr ent)
 	ScreenPtr screen = ent->slave_dst->drawable.pScreen;
 	ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
 	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(scrn);
-	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
-	xf86CrtcPtr crtc = NULL;
-	drmmode_crtc_private_ptr drmmode_crtc = NULL;
+	xf86CrtcPtr crtc = amdgpu_prime_dirty_to_crtc(ent);
+	drmmode_crtc_private_ptr drmmode_crtc;
 	uintptr_t drm_queue_seq;
 	unsigned scanout_id;
-	int c;
 
-	/* Find the CRTC which is scanning out from this slave pixmap */
-	for (c = 0; c < xf86_config->num_crtc; c++) {
-		crtc = xf86_config->crtc[c];
-		drmmode_crtc = crtc->driver_private;
-		scanout_id = drmmode_crtc->scanout_id;
-		if (drmmode_crtc->scanout[scanout_id].pixmap == ent->slave_dst)
-			break;
-	}
+	if (!crtc || !crtc->enabled)
+		return;
 
-	if (c == xf86_config->num_crtc ||
-	    !crtc->enabled ||
-	    drmmode_crtc->scanout_update_pending ||
+	drmmode_crtc = crtc->driver_private;
+	if (drmmode_crtc->scanout_update_pending ||
 	    !drmmode_crtc->scanout[drmmode_crtc->scanout_id].pixmap ||
 	    drmmode_crtc->pending_dpms_mode != DPMSModeOn)
 		return;