Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / gma500 / blitter.c

diff --git a/kernel/drivers/gpu/drm/gma500/blitter.c b/kernel/drivers/gpu/drm/gma500/blitter.c
new file mode 100644 (file)
index 0000000..9cd54a6
--- /dev/null
+++ b/kernel/drivers/gpu/drm/gma500/blitter.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2014, Patrik Jakobsson
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * Authors: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
+ */
+
+#include "psb_drv.h"
+
+#include "blitter.h"
+#include "psb_reg.h"
+
+/* Wait for the blitter to be completely idle */
+int gma_blt_wait_idle(struct drm_psb_private *dev_priv)
+{
+       unsigned long stop = jiffies + HZ;
+       int busy = 1;
+
+       /* NOP for Cedarview */
+       if (IS_CDV(dev_priv->dev))
+               return 0;
+
+       /* First do a quick check */
+       if ((PSB_RSGX32(PSB_CR_2D_SOCIF) == _PSB_C2_SOCIF_EMPTY) &&
+           ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) & _PSB_C2B_STATUS_BUSY) == 0))
+               return 0;
+
+       do {
+               busy = (PSB_RSGX32(PSB_CR_2D_SOCIF) != _PSB_C2_SOCIF_EMPTY);
+       } while (busy && !time_after_eq(jiffies, stop));
+
+       if (busy)
+               return -EBUSY;
+
+       do {
+               busy = ((PSB_RSGX32(PSB_CR_2D_BLIT_STATUS) &
+                       _PSB_C2B_STATUS_BUSY) != 0);
+       } while (busy && !time_after_eq(jiffies, stop));
+
+       /* If still busy, we probably have a hang */
+       return (busy) ? -EBUSY : 0;
+}