On Wed, Feb 22, 2017 at 2:09 PM, Maxime Ripard
[off-list ref] wrote:

Hi,

On Wed, Feb 22, 2017 at 11:23:06PM +0800, Icenowy Zheng wrote:

quoted

Allwinner have a new "Display Engine 2.0" in there new SoCs, which comes
in a new "Display Engine" (mixers instead of old backends and
frontends).

Add support for the mixer on Allwinner V3s SoC; it's the simplest one.

Signed-off-by: Icenowy Zheng <redacted>
---

[...]

quoted

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
new file mode 100644
index 000000000000..9427b57240d3
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c

@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.xyz>
+ *
+ * Based on sun4i_backend.c, which is:
+ *   Copyright (C) 2015 Free Electrons
+ *   Copyright (C) 2015 NextThing Co
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_plane_helper.h>
+
+#include <linux/component.h>
+#include <linux/reset.h>
+#include <linux/of_device.h>
+
+#include "sun8i_mixer.h"
+#include "sun4i_drv.h"
+
+#define SUN8I_DRAM_OFFSET 0x40000000

PHYS_OFFSET?

PHYS_OFFSET is not portable. __pa(PAGE_OFFSET) instead.

If your DMA addresses are different from CPU addresses (i.e. have some
offset), then use "dma-ranges" in DT.

Rob