[PATCH v4 00/11] Initial Allwinner Display Engine 2.0 Support

[PATCH v4 00/11] Initial Allwinner Display Engine 2.0 Support

[Icenowy Zheng]

This patchset is the initial patchset for Allwinner DE2 support.

It contains the support of clocks in DE2 and the mixers in DE2.

The SoC used to develop this patchset is V3s, as V3s is the simplest
one of the SoCs that have DE2.
(Allwinner V3s features only one mixer, although its clock control
unit contains support for second mixer's clock; and its only video
output is RGB LCD, which is already supported in our TCON driver)

The last patch is only a testing patch, it shouldn't be merged; and
for the patch to be really usable, the RFC fix of the TCON driver [1]
is needed.

No HDMI, TV encoder or other internal bridges' support is included
in this patchset, which makes it currently not usable on H3.

Thanks to Jean-Francois Moine and Jernej Skrabec for their efforts
to discover the internal of DE2!

[1] https://lists.freedesktop.org/archives/dri-devel/2016-December/126264.html

Icenowy Zheng (11):
  dt-bindings: add binding for the Allwinner DE2 CCU
  clk: sunxi-ng: add support for DE2 CCU
  dt-bindings: add bindings for DE2 on V3s SoC
  drm/sun4i: return only planes for layers created
  drm/sun4i: abstract a engine type
  drm/sun4i: add support for Allwinner DE2 mixers
  drm/sun4i: Add compatible string for V3s display engine
  drm/sun4i: tcon: add support for V3s TCON
  ARM: dts: sun8i: add DE2 nodes for V3s SoC
  ARM: dts: sun8i: add pinmux for LCD pins of V3s SoC
  [DO NOT MERGE] ARM: dts: sun8i: enable LCD panel of Lichee Pi Zero

 .../devicetree/bindings/clock/sun8i-de2.txt        |  31 ++
 .../bindings/display/sunxi/sun4i-drm.txt           |  29 +-
 arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts      |  36 ++
 arch/arm/boot/dts/sun8i-v3s.dtsi                   |  96 ++++++
 drivers/clk/sunxi-ng/Kconfig                       |   5 +
 drivers/clk/sunxi-ng/Makefile                      |   1 +
 drivers/clk/sunxi-ng/ccu-sun8i-de2.c               | 218 ++++++++++++
 drivers/clk/sunxi-ng/ccu-sun8i-de2.h               |  28 ++
 drivers/gpu/drm/sun4i/Kconfig                      |  20 ++
 drivers/gpu/drm/sun4i/Makefile                     |  10 +-
 drivers/gpu/drm/sun4i/sun4i_backend.c              |  26 +-
 drivers/gpu/drm/sun4i/sun4i_backend.h              |   5 -
 drivers/gpu/drm/sun4i/sun4i_crtc.c                 |  35 +-
 drivers/gpu/drm/sun4i/sun4i_crtc.h                 |   8 +-
 drivers/gpu/drm/sun4i/sun4i_drv.c                  |   4 +-
 drivers/gpu/drm/sun4i/sun4i_drv.h                  |   3 +-
 drivers/gpu/drm/sun4i/sun4i_layer.c                |  18 +-
 drivers/gpu/drm/sun4i/sun4i_layer.h                |   7 +-
 drivers/gpu/drm/sun4i/sun4i_tcon.c                 |   7 +-
 drivers/gpu/drm/sun4i/sun4i_tv.c                   |  11 +-
 drivers/gpu/drm/sun4i/sun8i_layer.c                | 142 ++++++++
 drivers/gpu/drm/sun4i/sun8i_layer.h                |  36 ++
 drivers/gpu/drm/sun4i/sun8i_mixer.c                | 381 +++++++++++++++++++++
 drivers/gpu/drm/sun4i/sun8i_mixer.h                | 131 +++++++
 drivers/gpu/drm/sun4i/sunxi_engine.h               |  35 ++
 include/dt-bindings/clock/sun8i-de2.h              |  54 +++
 include/dt-bindings/reset/sun8i-de2.h              |  50 +++
 27 files changed, 1371 insertions(+), 56 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/clock/sun8i-de2.txt
 create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.c
 create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.h
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.c
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.h
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.c
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.h
 create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h
 create mode 100644 include/dt-bindings/clock/sun8i-de2.h
 create mode 100644 include/dt-bindings/reset/sun8i-de2.h

-- 
2.12.2

[PATCH v4 01/11] dt-bindings: add binding for the Allwinner DE2 CCU

[Icenowy Zheng]

Allwinner "Display Engine 2.0" contains some clock controls in it.

In order to add them as clock drivers, we need a device tree binding.
Add the binding here.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Dropped the leading 0 in clock@1000000 .
Changes in v3:
- Fill the address space length of DE2 CCU to 0x100000, just reach the start of mixer0.

 .../devicetree/bindings/clock/sun8i-de2.txt        | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/sun8i-de2.txt

diff --git a/Documentation/devicetree/bindings/clock/sun8i-de2.txt b/Documentation/devicetree/bindings/clock/sun8i-de2.txt
new file mode 100644
index 000000000000..15a60bd7dcf3
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/sun8i-de2.txt
@@ -0,0 +1,31 @@
+Allwinner Display Engine 2.0 Clock Control Binding
+--------------------------------------------------
+
+Required properties :
+- compatible: must contain one of the following compatibles:
+		- "allwinner,sun8i-a83t-de2-clk"
+		- "allwinner,sun50i-a64-de2-clk"
+		- "allwinner,sun50i-h5-de2-clk"
+
+- reg: Must contain the registers base address and length
+- clocks: phandle to the clocks feeding the display engine subsystem.
+	  Three are needed:
+  - "mod": the display engine module clock
+  - "bus": the bus clock for the whole display engine subsystem
+- clock-names: Must contain the clock names described just above
+- resets: phandle to the reset control for the display engine subsystem.
+- #clock-cells : must contain 1
+- #reset-cells : must contain 1
+
+Example:
+de2_clocks: clock@1000000 {
+	compatible = "allwinner,sun50i-a64-de2-clk";
+	reg = <0x01000000 0x100000>;
+	clocks = <&ccu CLK_DE>,
+		 <&ccu CLK_BUS_DE>;
+	clock-names = "mod",
+		      "bus";
+	resets = <&ccu RST_BUS_DE>;
+	#clock-cells = <1>;
+	#reset-cells = <1>;
+};
-- 
2.12.2

[PATCH v4 02/11] clk: sunxi-ng: add support for DE2 CCU

[Icenowy Zheng]

The "Display Engine 2.0" in Allwinner newer SoCs contains a clock
management unit for its subunits, like the DE CCU in A80.

Add a sunxi-ng style driver for it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Fixed the inconsistence between mixer_div clocks' number and real clock.
Changes in v2:
- Rename sunxi-de2-ccu to sun8i-de2-ccu.

 drivers/clk/sunxi-ng/Kconfig          |   5 +
 drivers/clk/sunxi-ng/Makefile         |   1 +
 drivers/clk/sunxi-ng/ccu-sun8i-de2.c  | 218 ++++++++++++++++++++++++++++++++++
 drivers/clk/sunxi-ng/ccu-sun8i-de2.h  |  28 +++++
 include/dt-bindings/clock/sun8i-de2.h |  54 +++++++++
 include/dt-bindings/reset/sun8i-de2.h |  50 ++++++++
 6 files changed, 356 insertions(+)
 create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.c
 create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.h
 create mode 100644 include/dt-bindings/clock/sun8i-de2.h
 create mode 100644 include/dt-bindings/reset/sun8i-de2.h

diff --git a/drivers/clk/sunxi-ng/Kconfig b/drivers/clk/sunxi-ng/Kconfig
index fbd3f8cd5c22..7c7f55dc7f65 100644
--- a/drivers/clk/sunxi-ng/Kconfig
+++ b/drivers/clk/sunxi-ng/Kconfig
@@ -140,6 +140,11 @@ config SUN8I_V3S_CCU
 	default MACH_SUN8I
 	depends on MACH_SUN8I || COMPILE_TEST
 
+config SUN8I_DE2_CCU
+	bool "Support for the Allwinner SoCs DE2 CCU"
+	select SUNXI_CCU_DIV
+	select SUNXI_CCU_GATE
+
 config SUN9I_A80_CCU
 	bool "Support for the Allwinner A80 CCU"
 	select SUNXI_CCU_DIV
diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
index 0ec02fe14c50..be616279450e 100644
--- a/drivers/clk/sunxi-ng/Makefile
+++ b/drivers/clk/sunxi-ng/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_SUN8I_A23_CCU)	+= ccu-sun8i-a23.o
 obj-$(CONFIG_SUN8I_A33_CCU)	+= ccu-sun8i-a33.o
 obj-$(CONFIG_SUN8I_H3_CCU)	+= ccu-sun8i-h3.o
 obj-$(CONFIG_SUN8I_V3S_CCU)	+= ccu-sun8i-v3s.o
+obj-$(CONFIG_SUN8I_DE2_CCU)	+= ccu-sun8i-de2.o
 obj-$(CONFIG_SUN8I_R_CCU)	+= ccu-sun8i-r.o
 obj-$(CONFIG_SUN9I_A80_CCU)	+= ccu-sun9i-a80.o
 obj-$(CONFIG_SUN9I_A80_CCU)	+= ccu-sun9i-a80-de.o
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-de2.c b/drivers/clk/sunxi-ng/ccu-sun8i-de2.c
new file mode 100644
index 000000000000..30fe42635635
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-de2.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include "ccu_common.h"
+#include "ccu_div.h"
+#include "ccu_gate.h"
+#include "ccu_reset.h"
+
+#include "ccu-sun8i-de2.h"
+
+static SUNXI_CCU_GATE(bus_mixer0_clk,	"bus-mixer0",	"bus-de",
+		      0x04, BIT(0), 0);
+static SUNXI_CCU_GATE(bus_mixer1_clk,	"bus-mixer1",	"bus-de",
+		      0x04, BIT(1), 0);
+static SUNXI_CCU_GATE(bus_wb_clk,	"bus-wb",	"bus-de",
+		      0x04, BIT(2), 0);
+
+static SUNXI_CCU_GATE(mixer0_clk,	"mixer0",	"mixer0-div",
+		      0x00, BIT(0), CLK_SET_RATE_PARENT);
+static SUNXI_CCU_GATE(mixer1_clk,	"mixer1",	"mixer1-div",
+		      0x00, BIT(1), CLK_SET_RATE_PARENT);
+static SUNXI_CCU_GATE(wb_clk,		"wb",		"wb-div",
+		      0x00, BIT(2), CLK_SET_RATE_PARENT);
+
+static SUNXI_CCU_M(mixer0_div_clk, "mixer0-div", "de", 0x0c, 0, 4,
+		   CLK_SET_RATE_PARENT);
+static SUNXI_CCU_M(mixer1_div_clk, "mixer1-div", "de", 0x0c, 4, 4,
+		   CLK_SET_RATE_PARENT);
+static SUNXI_CCU_M(wb_div_clk, "wb-div", "de", 0x0c, 8, 4,
+		   CLK_SET_RATE_PARENT);
+
+static struct ccu_common *sunxi_de2_clks[] = {
+	&mixer0_clk.common,
+	&mixer1_clk.common,
+	&wb_clk.common,
+
+	&bus_mixer0_clk.common,
+	&bus_mixer1_clk.common,
+	&bus_wb_clk.common,
+
+	&mixer0_div_clk.common,
+	&mixer1_div_clk.common,
+	&wb_div_clk.common,
+};
+
+static struct clk_hw_onecell_data sunxi_de2_hw_clks = {
+	.hws	= {
+		[CLK_MIXER0]		= &mixer0_clk.common.hw,
+		[CLK_MIXER1]		= &mixer1_clk.common.hw,
+		[CLK_WB]		= &wb_clk.common.hw,
+
+		[CLK_BUS_MIXER0]	= &bus_mixer0_clk.common.hw,
+		[CLK_BUS_MIXER1]	= &bus_mixer1_clk.common.hw,
+		[CLK_BUS_WB]		= &bus_wb_clk.common.hw,
+
+		[CLK_MIXER0_DIV]	= &mixer0_div_clk.common.hw,
+		[CLK_MIXER1_DIV]	= &mixer1_div_clk.common.hw,
+		[CLK_WB_DIV]		= &wb_div_clk.common.hw,
+	},
+	.num	= CLK_NUMBER,
+};
+
+static struct ccu_reset_map sun8i_a83t_de2_resets[] = {
+	[RST_MIXER0]	= { 0x08, BIT(0) },
+	/*
+	 * For A83T, H3 and R40, mixer1 reset line is shared with wb, so
+	 * only RST_WB is exported here.
+	 */
+	[RST_WB]	= { 0x08, BIT(2) },
+};
+
+static struct ccu_reset_map sun50i_a64_de2_resets[] = {
+	[RST_MIXER0]	= { 0x08, BIT(0) },
+	[RST_MIXER1]	= { 0x08, BIT(1) },
+	[RST_WB]	= { 0x08, BIT(2) },
+};
+
+static const struct sunxi_ccu_desc sun8i_a83t_de2_clk_desc = {
+	.ccu_clks	= sunxi_de2_clks,
+	.num_ccu_clks	= ARRAY_SIZE(sunxi_de2_clks),
+
+	.hw_clks	= &sunxi_de2_hw_clks,
+
+	.resets		= sun8i_a83t_de2_resets,
+	.num_resets	= ARRAY_SIZE(sun8i_a83t_de2_resets),
+};
+
+static const struct sunxi_ccu_desc sun50i_a64_de2_clk_desc = {
+	.ccu_clks	= sunxi_de2_clks,
+	.num_ccu_clks	= ARRAY_SIZE(sunxi_de2_clks),
+
+	.hw_clks	= &sunxi_de2_hw_clks,
+
+	.resets		= sun50i_a64_de2_resets,
+	.num_resets	= ARRAY_SIZE(sun50i_a64_de2_resets),
+};
+
+static int sunxi_de2_clk_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct clk *bus_clk, *mod_clk;
+	struct reset_control *rstc;
+	void __iomem *reg;
+	const struct sunxi_ccu_desc *ccu_desc;
+	int ret;
+
+	ccu_desc = of_device_get_match_data(&pdev->dev);
+	if (!ccu_desc)
+		return -EINVAL;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
+
+	bus_clk = devm_clk_get(&pdev->dev, "bus");
+	if (IS_ERR(bus_clk)) {
+		ret = PTR_ERR(bus_clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Couldn't get bus clk: %d\n", ret);
+		return ret;
+	}
+
+	mod_clk = devm_clk_get(&pdev->dev, "mod");
+	if (IS_ERR(mod_clk)) {
+		ret = PTR_ERR(mod_clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Couldn't get mod clk: %d\n", ret);
+		return ret;
+	}
+
+	rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(rstc)) {
+		ret = PTR_ERR(bus_clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"Couldn't get reset control: %d\n", ret);
+		return ret;
+	}
+
+	/* The clocks need to be enabled for us to access the registers */
+	ret = clk_prepare_enable(bus_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't enable bus clk: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(mod_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't enable mod clk: %d\n", ret);
+		return ret;
+	}
+
+	/* The reset control needs to be asserted for the controls to work */
+	ret = reset_control_deassert(rstc);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Couldn't deassert reset control: %d\n", ret);
+		goto err_disable_clk;
+	}
+
+	ret = sunxi_ccu_probe(pdev->dev.of_node, reg, ccu_desc);
+	if (ret)
+		goto err_assert_reset;
+
+	return 0;
+
+err_assert_reset:
+	reset_control_assert(rstc);
+err_disable_clk:
+	clk_disable_unprepare(bus_clk);
+	return ret;
+}
+
+static const struct of_device_id sunxi_de2_clk_ids[] = {
+	{
+		.compatible = "allwinner,sun8i-a83t-de2-clk",
+		.data = &sun8i_a83t_de2_clk_desc,
+	},
+	{
+		.compatible = "allwinner,sun50i-h5-de2-clk",
+		.data = &sun50i_a64_de2_clk_desc,
+	},
+	/*
+	 * The Allwinner A64 SoC needs some bit to be poke in syscon to make
+	 * DE2 really working.
+	 * So there's currently no A64 compatible here.
+	 * H5 shares the same reset line with A64, so here H5 is using the
+	 * clock description of A64.
+	 */
+	{ }
+};
+
+static struct platform_driver sunxi_de2_clk_driver = {
+	.probe	= sunxi_de2_clk_probe,
+	.driver	= {
+		.name	= "sunxi-de2-clks",
+		.of_match_table	= sunxi_de2_clk_ids,
+	},
+};
+builtin_platform_driver(sunxi_de2_clk_driver);
diff --git a/drivers/clk/sunxi-ng/ccu-sun8i-de2.h b/drivers/clk/sunxi-ng/ccu-sun8i-de2.h
new file mode 100644
index 000000000000..530c006e0ae9
--- /dev/null
+++ b/drivers/clk/sunxi-ng/ccu-sun8i-de2.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef _CCU_SUN8I_DE2_H_
+#define _CCU_SUN8I_DE2_H_
+
+#include <dt-bindings/clock/sun8i-de2.h>
+#include <dt-bindings/reset/sun8i-de2.h>
+
+/* Intermediary clock dividers are not exported */
+#define CLK_MIXER0_DIV	3
+#define CLK_MIXER1_DIV	4
+#define CLK_WB_DIV	5
+
+#define CLK_NUMBER	(CLK_WB + 1)
+
+#endif /* _CCU_SUN8I_DE2_H_ */
diff --git a/include/dt-bindings/clock/sun8i-de2.h b/include/dt-bindings/clock/sun8i-de2.h
new file mode 100644
index 000000000000..982c6d18c75b
--- /dev/null
+++ b/include/dt-bindings/clock/sun8i-de2.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * This file is dual-licensed: you can use it either under the terms
+ * of the GPL or the X11 license, at your option. Note that this dual
+ * licensing only applies to this file, and not this project as a
+ * whole.
+ *
+ *  a) This file 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.
+ *
+ *     This file is distributed in the hope that 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.
+ *
+ * Or, alternatively,
+ *
+ *  b) Permission is hereby granted, free of charge, to any person
+ *     obtaining a copy of this software and associated documentation
+ *     files (the "Software"), to deal in the Software without
+ *     restriction, including without limitation the rights to use,
+ *     copy, modify, merge, publish, distribute, sublicense, and/or
+ *     sell copies of the Software, and to permit persons to whom the
+ *     Software is furnished to do so, subject to the following
+ *     conditions:
+ *
+ *     The above copyright notice and this permission notice shall be
+ *     included in all copies or substantial portions of the Software.
+ *
+ *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *     OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_SUN8I_DE2_H_
+#define _DT_BINDINGS_CLOCK_SUN8I_DE2_H_
+
+#define CLK_BUS_MIXER0		0
+#define CLK_BUS_MIXER1		1
+#define CLK_BUS_WB		2
+
+#define CLK_MIXER0		6
+#define CLK_MIXER1		7
+#define CLK_WB			8
+
+#endif /* _DT_BINDINGS_CLOCK_SUN8I_DE2_H_ */
diff --git a/include/dt-bindings/reset/sun8i-de2.h b/include/dt-bindings/reset/sun8i-de2.h
new file mode 100644
index 000000000000..52af2dc55376
--- /dev/null
+++ b/include/dt-bindings/reset/sun8i-de2.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * This file is dual-licensed: you can use it either under the terms
+ * of the GPL or the X11 license, at your option. Note that this dual
+ * licensing only applies to this file, and not this project as a
+ * whole.
+ *
+ *  a) This file 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.
+ *
+ *     This file is distributed in the hope that 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.
+ *
+ * Or, alternatively,
+ *
+ *  b) Permission is hereby granted, free of charge, to any person
+ *     obtaining a copy of this software and associated documentation
+ *     files (the "Software"), to deal in the Software without
+ *     restriction, including without limitation the rights to use,
+ *     copy, modify, merge, publish, distribute, sublicense, and/or
+ *     sell copies of the Software, and to permit persons to whom the
+ *     Software is furnished to do so, subject to the following
+ *     conditions:
+ *
+ *     The above copyright notice and this permission notice shall be
+ *     included in all copies or substantial portions of the Software.
+ *
+ *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *     OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _DT_BINDINGS_RESET_SUN8I_DE2_H_
+#define _DT_BINDINGS_RESET_SUN8I_DE2_H_
+
+#define RST_MIXER0	0
+#define RST_MIXER1	1
+#define RST_WB		2
+
+#endif /* _DT_BINDINGS_RESET_SUN8I_DE2_H_ */
-- 
2.12.2

[PATCH v4 03/11] dt-bindings: add bindings for DE2 on V3s SoC

[Icenowy Zheng]

Allwinner V3s SoC have a display engine which have a different pipeline
with older SoCs.

Add document for it (new compatibles and the new "mixer" part).

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Removed the refactor at TCON chapter.

Changes in v3:
- Remove the description of having a BE directly as allwinner,pipeline.

 .../bindings/display/sunxi/sun4i-drm.txt           | 29 ++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
index 57a8d0610062..7da80e26d61b 100644
--- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
+++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
@@ -31,6 +31,7 @@ Required properties:
    * allwinner,sun6i-a31-tcon
    * allwinner,sun6i-a31s-tcon
    * allwinner,sun8i-a33-tcon
+   * allwinner,sun8i-v3s-tcon
  - reg: base address and size of memory-mapped region
  - interrupts: interrupt associated to this IP
  - clocks: phandles to the clocks feeding the TCON. Three are needed:
@@ -52,7 +53,7 @@ Required properties:
   second the block connected to the TCON channel 1 (usually the TV
   encoder)
 
-On SoCs other than the A33, there is one more clock required:
+On SoCs other than the A33 and V3s, there is one more clock required:
    - 'tcon-ch1': The clock driving the TCON channel 1
 
 DRC
@@ -138,6 +139,26 @@ Required properties:
   Documentation/devicetree/bindings/media/video-interfaces.txt. The
   first port should be the input endpoints, the second one the outputs
 
+Display Engine 2.0 Mixer
+------------------------
+
+The DE2 mixer have many functionalities, currently only layer blending is
+supported.
+
+Required properties:
+  - compatible: value must be one of:
+    * allwinner,sun8i-v3s-de2-mixer
+  - reg: base address and size of the memory-mapped region.
+  - clocks: phandles to the clocks feeding the frontend and backend
+    * bus: the backend interface clock
+    * ram: the backend DRAM clock
+  - clock-names: the clock names mentioned above
+  - resets: phandles to the reset controllers driving the backend
+
+- ports: A ports node with endpoint definitions as defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt. The
+  first port should be the input endpoints, the second one the output
+
 
 Display Engine Pipeline
 -----------------------
@@ -152,9 +173,13 @@ Required properties:
     * allwinner,sun6i-a31-display-engine
     * allwinner,sun6i-a31s-display-engine
     * allwinner,sun8i-a33-display-engine
+    * allwinner,sun8i-v3s-display-engine
 
   - allwinner,pipelines: list of phandle to the display engine
-    frontends available.
+    pipeline entry point. For SoCs with original DE (currently
+    all SoCs supported by display engine except V3s), this
+    phandle should be a display frontend; for SoCs with DE2,
+    this phandle should be a mixer.
 
 Example:
 
-- 
2.12.2

[PATCH v4 04/11] drm/sun4i: return only planes for layers created

[Icenowy Zheng]

As we are going to add support for the Allwinner DE2 Mixer in sun4i-drm
driver, we will finally have two types of layers.

Each layer is bound to a drm_plane that is CRTC-specific, so we create
them when initializing CRTC (calling sun4i_layers_init, which will be
generalized in next patch). The drm_plane's will be used when creating
CRTC, but the CRTC initialization code do not care other properties of
the layer, so we let the sun4i_layers_init function return drm_plane's
only.

As we have no need to trace the layers after the CRTC is properly
created, we drop the layers pointer in sun4i_crtc struct.

Doing these things makes the CRTC code independent to the type of layer
(the sun4i_layers_init function name is still hardcoded and will be
changed in the next patch), so that we can finally gain support for the
mixer in DE2, which will has different layers.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Big refactor of "drm/sun4i: abstract the layer type" in v3.

The layer_ops and sunxi_layer.h are dropped, and the univeral type used
to represent layers(planes) is now directly drm_plane.

 drivers/gpu/drm/sun4i/sun4i_crtc.c  | 23 ++++++++++++-----------
 drivers/gpu/drm/sun4i/sun4i_crtc.h  |  1 -
 drivers/gpu/drm/sun4i/sun4i_layer.c | 18 ++++++++++--------
 drivers/gpu/drm/sun4i/sun4i_layer.h |  4 ++--
 4 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 3c876c3a356a..708b3543d4e9 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -139,6 +139,7 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 				   struct sun4i_tcon *tcon)
 {
 	struct sun4i_crtc *scrtc;
+	struct drm_plane **planes;
 	struct drm_plane *primary = NULL, *cursor = NULL;
 	int ret, i;
 
@@ -149,22 +150,22 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 	scrtc->tcon = tcon;
 
 	/* Create our layers */
-	scrtc->layers = sun4i_layers_init(drm, scrtc->backend);
-	if (IS_ERR(scrtc->layers)) {
+	planes = sun4i_layers_init(drm, scrtc);
+	if (IS_ERR(planes)) {
 		dev_err(drm->dev, "Couldn't create the planes\n");
 		return NULL;
 	}
 
 	/* find primary and cursor planes for drm_crtc_init_with_planes */
-	for (i = 0; scrtc->layers[i]; i++) {
-		struct sun4i_layer *layer = scrtc->layers[i];
+	for (i = 0; planes[i]; i++) {
+		struct drm_plane *plane = planes[i];
 
-		switch (layer->plane.type) {
+		switch (plane->type) {
 		case DRM_PLANE_TYPE_PRIMARY:
-			primary = &layer->plane;
+			primary = plane;
 			break;
 		case DRM_PLANE_TYPE_CURSOR:
-			cursor = &layer->plane;
+			cursor = plane;
 			break;
 		default:
 			break;
@@ -188,12 +189,12 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 						   1);
 
 	/* Set possible_crtcs to this crtc for overlay planes */
-	for (i = 0; scrtc->layers[i]; i++) {
+	for (i = 0; planes[i]; i++) {
 		uint32_t possible_crtcs = BIT(drm_crtc_index(&scrtc->crtc));
-		struct sun4i_layer *layer = scrtc->layers[i];
+		struct drm_plane *plane = planes[i];
 
-		if (layer->plane.type == DRM_PLANE_TYPE_OVERLAY)
-			layer->plane.possible_crtcs = possible_crtcs;
+		if (plane->type == DRM_PLANE_TYPE_OVERLAY)
+			plane->possible_crtcs = possible_crtcs;
 	}
 
 	return scrtc;
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.h b/drivers/gpu/drm/sun4i/sun4i_crtc.h
index 230cb8f0d601..4dae3508424a 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.h
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.h
@@ -19,7 +19,6 @@ struct sun4i_crtc {
 
 	struct sun4i_backend		*backend;
 	struct sun4i_tcon		*tcon;
-	struct sun4i_layer		**layers;
 };
 
 static inline struct sun4i_crtc *drm_crtc_to_sun4i_crtc(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
index f26bde5b9117..e1f03e1cc0ac 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -16,6 +16,7 @@
 #include <drm/drmP.h>
 
 #include "sun4i_backend.h"
+#include "sun4i_crtc.h"
 #include "sun4i_layer.h"
 
 struct sun4i_plane_desc {
@@ -128,15 +129,16 @@ static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
 	return layer;
 }
 
-struct sun4i_layer **sun4i_layers_init(struct drm_device *drm,
-				       struct sun4i_backend *backend)
+struct drm_plane **sun4i_layers_init(struct drm_device *drm,
+				     struct sun4i_crtc *crtc)
 {
-	struct sun4i_layer **layers;
+	struct drm_plane **planes;
+	struct sun4i_backend *backend = crtc->backend;
 	int i;
 
-	layers = devm_kcalloc(drm->dev, ARRAY_SIZE(sun4i_backend_planes) + 1,
-			      sizeof(*layers), GFP_KERNEL);
-	if (!layers)
+	planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun4i_backend_planes) + 1,
+			      sizeof(*planes), GFP_KERNEL);
+	if (!planes)
 		return ERR_PTR(-ENOMEM);
 
 	/*
@@ -178,8 +180,8 @@ struct sun4i_layer **sun4i_layers_init(struct drm_device *drm,
 				   SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(plane->pipe));
 
 		layer->id = i;
-		layers[i] = layer;
+		planes[i] = &layer->plane;
 	};
 
-	return layers;
+	return planes;
 }
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h
index 4be1f0919df2..5ea5c994d6ea 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.h
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
@@ -26,7 +26,7 @@ plane_to_sun4i_layer(struct drm_plane *plane)
 	return container_of(plane, struct sun4i_layer, plane);
 }
 
-struct sun4i_layer **sun4i_layers_init(struct drm_device *drm,
-				       struct sun4i_backend *backend);
+struct drm_plane **sun4i_layers_init(struct drm_device *drm,
+				     struct sun4i_crtc *crtc);
 
 #endif /* _SUN4I_LAYER_H_ */
-- 
2.12.2

[PATCH v4 05/11] drm/sun4i: abstract a engine type

[Icenowy Zheng]

As we are going to add support for the Allwinner DE2 engine in sun4i-drm
driver, we will finally have two types of display engines -- the DE1
backend and the DE2 mixer. They both do some display blending and feed
graphics data to TCON, so I choose to call them both "engine" here.

Abstract the engine type to void * and a ops struct, which contains
functions that should be called outside the engine-specified code (in
TCON, CRTC or TV Encoder code).

A dedicated Kconfig option is also added to control whether
sun4i-backend-specified code (sun4i_backend.c and sun4i_layer.c) should
be built. As we removed the codes in CRTC code that directly call the
layer code, we can now extract the layer part and combine it with the
backend part into a new module, sun4i-backend.ko.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Comments to tag the color correction functions as optional.
- Check before calling the optional functions.
- Change layers_init to satisfy new PATCH v4 04/11.

 drivers/gpu/drm/sun4i/Kconfig         | 10 ++++++++++
 drivers/gpu/drm/sun4i/Makefile        |  6 ++++--
 drivers/gpu/drm/sun4i/sun4i_backend.c | 26 +++++++++++++++++++-------
 drivers/gpu/drm/sun4i/sun4i_backend.h |  5 -----
 drivers/gpu/drm/sun4i/sun4i_crtc.c    | 14 +++++++-------
 drivers/gpu/drm/sun4i/sun4i_crtc.h    |  7 ++++---
 drivers/gpu/drm/sun4i/sun4i_drv.h     |  3 ++-
 drivers/gpu/drm/sun4i/sun4i_layer.c   |  2 +-
 drivers/gpu/drm/sun4i/sun4i_layer.h   |  3 ++-
 drivers/gpu/drm/sun4i/sun4i_tcon.c    |  2 +-
 drivers/gpu/drm/sun4i/sun4i_tv.c      | 11 ++++++-----
 drivers/gpu/drm/sun4i/sunxi_engine.h  | 35 +++++++++++++++++++++++++++++++++++
 12 files changed, 91 insertions(+), 33 deletions(-)
 create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
index a4b357db8856..5a8227f37cc4 100644
--- a/drivers/gpu/drm/sun4i/Kconfig
+++ b/drivers/gpu/drm/sun4i/Kconfig
@@ -12,3 +12,13 @@ config DRM_SUN4I
 	  Choose this option if you have an Allwinner SoC with a
 	  Display Engine. If M is selected the module will be called
 	  sun4i-drm.
+
+config DRM_SUN4I_BACKEND
+	tristate "Support for Allwinner A10 Display Engine Backend"
+	depends on DRM_SUN4I
+	default DRM_SUN4I
+	help
+	  Choose this option if you have an Allwinner SoC with the
+	  original Allwinner Display Engine, which has a backend to
+	  do some alpha blending and feed graphics to TCON. If M is
+	  selected the module will be called sun4i-backend.
diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 59b757350a1f..1db1068b9be1 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -5,9 +5,11 @@ sun4i-tcon-y += sun4i_tcon.o
 sun4i-tcon-y += sun4i_rgb.o
 sun4i-tcon-y += sun4i_dotclock.o
 sun4i-tcon-y += sun4i_crtc.o
-sun4i-tcon-y += sun4i_layer.o
+
+sun4i-backend-y += sun4i_layer.o
+sun4i-backend-y += sun4i_backend.o
 
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
-obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
+obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index d660741ba475..a16c96a002a4 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -23,6 +23,8 @@
 
 #include "sun4i_backend.h"
 #include "sun4i_drv.h"
+#include "sun4i_layer.h"
+#include "sunxi_engine.h"
 
 static const u32 sunxi_rgb2yuv_coef[12] = {
 	0x00000107, 0x00000204, 0x00000064, 0x00000108,
@@ -30,9 +32,10 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
 	0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
 };
 
-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend)
+static void sun4i_backend_apply_color_correction(void *engine)
 {
 	int i;
+	struct sun4i_backend *backend = engine;
 
 	DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");
 
@@ -44,27 +47,28 @@ void sun4i_backend_apply_color_correction(struct sun4i_backend *backend)
 		regmap_write(backend->regs, SUN4I_BACKEND_OCRCOEF_REG(i),
 			     sunxi_rgb2yuv_coef[i]);
 }
-EXPORT_SYMBOL(sun4i_backend_apply_color_correction);
 
-void sun4i_backend_disable_color_correction(struct sun4i_backend *backend)
+static void sun4i_backend_disable_color_correction(void *engine)
 {
+	struct sun4i_backend *backend = engine;
+
 	DRM_DEBUG_DRIVER("Disabling color correction\n");
 
 	/* Disable color correction */
 	regmap_update_bits(backend->regs, SUN4I_BACKEND_OCCTL_REG,
 			   SUN4I_BACKEND_OCCTL_ENABLE, 0);
 }
-EXPORT_SYMBOL(sun4i_backend_disable_color_correction);
 
-void sun4i_backend_commit(struct sun4i_backend *backend)
+static void sun4i_backend_commit(void *engine)
 {
+	struct sun4i_backend *backend = engine;
+
 	DRM_DEBUG_DRIVER("Committing changes\n");
 
 	regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
 		     SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
 		     SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
 }
-EXPORT_SYMBOL(sun4i_backend_commit);
 
 void sun4i_backend_layer_enable(struct sun4i_backend *backend,
 				int layer, bool enable)
@@ -288,6 +292,13 @@ static int sun4i_backend_free_sat(struct device *dev) {
 	return 0;
 }
 
+static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
+	.commit = sun4i_backend_commit,
+	.layers_init = sun4i_layers_init,
+	.apply_color_correction = sun4i_backend_apply_color_correction,
+	.disable_color_correction = sun4i_backend_disable_color_correction,
+};
+
 static struct regmap_config sun4i_backend_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
@@ -310,7 +321,8 @@ static int sun4i_backend_bind(struct device *dev, struct device *master,
 	if (!backend)
 		return -ENOMEM;
 	dev_set_drvdata(dev, backend);
-	drv->backend = backend;
+	drv->engine = backend;
+	drv->engine_ops = &sun4i_backend_engine_ops;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(dev, res);
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
index 83e63cc702b4..65ef521de7d2 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -151,11 +151,6 @@ struct sun4i_backend {
 	struct reset_control	*sat_reset;
 };
 
-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend);
-void sun4i_backend_disable_color_correction(struct sun4i_backend *backend);
-
-void sun4i_backend_commit(struct sun4i_backend *backend);
-
 void sun4i_backend_layer_enable(struct sun4i_backend *backend,
 				int layer, bool enable);
 int sun4i_backend_update_layer_coord(struct sun4i_backend *backend,
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 708b3543d4e9..942428bee4f0 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -25,10 +25,9 @@
 
 #include <video/videomode.h>
 
-#include "sun4i_backend.h"
 #include "sun4i_crtc.h"
 #include "sun4i_drv.h"
-#include "sun4i_layer.h"
+#include "sunxi_engine.h"
 #include "sun4i_tcon.h"
 
 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
@@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	DRM_DEBUG_DRIVER("Committing plane changes\n");
 
-	sun4i_backend_commit(scrtc->backend);
+	scrtc->engine_ops->commit(scrtc->engine);
 
 	if (event) {
 		crtc->state->event = NULL;
@@ -134,8 +133,8 @@ static const struct drm_crtc_funcs sun4i_crtc_funcs = {
 	.disable_vblank		= sun4i_crtc_disable_vblank,
 };
 
-struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
-				   struct sun4i_backend *backend,
+struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm, void *engine,
+				   const struct sunxi_engine_ops *engine_ops,
 				   struct sun4i_tcon *tcon)
 {
 	struct sun4i_crtc *scrtc;
@@ -146,11 +145,12 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
 	scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
 	if (!scrtc)
 		return ERR_PTR(-ENOMEM);
-	scrtc->backend = backend;
+	scrtc->engine = engine;
+	scrtc->engine_ops = engine_ops;
 	scrtc->tcon = tcon;
 
 	/* Create our layers */
-	planes = sun4i_layers_init(drm, scrtc);
+	planes = engine_ops->layers_init(drm, scrtc);
 	if (IS_ERR(planes)) {
 		dev_err(drm->dev, "Couldn't create the planes\n");
 		return NULL;
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.h b/drivers/gpu/drm/sun4i/sun4i_crtc.h
index 4dae3508424a..d3a05ab3b861 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.h
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.h
@@ -17,7 +17,8 @@ struct sun4i_crtc {
 	struct drm_crtc			crtc;
 	struct drm_pending_vblank_event	*event;
 
-	struct sun4i_backend		*backend;
+	void				*engine;
+	const struct sunxi_engine_ops	*engine_ops;
 	struct sun4i_tcon		*tcon;
 };
 
@@ -26,8 +27,8 @@ static inline struct sun4i_crtc *drm_crtc_to_sun4i_crtc(struct drm_crtc *crtc)
 	return container_of(crtc, struct sun4i_crtc, crtc);
 }
 
-struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
-				   struct sun4i_backend *backend,
+struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm, void *engine,
+				   const struct sunxi_engine_ops *engine_ops,
 				   struct sun4i_tcon *tcon);
 
 #endif /* _SUN4I_CRTC_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.h b/drivers/gpu/drm/sun4i/sun4i_drv.h
index 5df50126ff52..abef4d3930a5 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.h
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.h
@@ -17,8 +17,9 @@
 #include <linux/regmap.h>
 
 struct sun4i_drv {
-	struct sun4i_backend	*backend;
+	void			*engine;
 	struct sun4i_tcon	*tcon;
+	const struct sunxi_engine_ops *engine_ops;
 
 	struct drm_fbdev_cma	*fbdev;
 };
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
index e1f03e1cc0ac..2940bab85dc1 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -133,7 +133,7 @@ struct drm_plane **sun4i_layers_init(struct drm_device *drm,
 				     struct sun4i_crtc *crtc)
 {
 	struct drm_plane **planes;
-	struct sun4i_backend *backend = crtc->backend;
+	struct sun4i_backend *backend = crtc->engine;
 	int i;
 
 	planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun4i_backend_planes) + 1,
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h
index 5ea5c994d6ea..597dda60d080 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.h
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
@@ -13,6 +13,8 @@
 #ifndef _SUN4I_LAYER_H_
 #define _SUN4I_LAYER_H_
 
+struct sun4i_crtc;
+
 struct sun4i_layer {
 	struct drm_plane	plane;
 	struct sun4i_drv	*drv;
@@ -28,5 +30,4 @@ plane_to_sun4i_layer(struct drm_plane *plane)
 
 struct drm_plane **sun4i_layers_init(struct drm_device *drm,
 				     struct sun4i_crtc *crtc);
-
 #endif /* _SUN4I_LAYER_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 9a83a85529ac..f50ecb75c177 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -459,7 +459,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
 		goto err_free_dotclock;
 	}
 
-	tcon->crtc = sun4i_crtc_init(drm, drv->backend, tcon);
+	tcon->crtc = sun4i_crtc_init(drm, drv->engine, drv->engine_ops, tcon);
 	if (IS_ERR(tcon->crtc)) {
 		dev_err(dev, "Couldn't create our CRTC\n");
 		ret = PTR_ERR(tcon->crtc);
diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
index 49c49431a053..e2a3986313aa 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
@@ -22,10 +22,10 @@
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 
-#include "sun4i_backend.h"
 #include "sun4i_crtc.h"
 #include "sun4i_drv.h"
 #include "sun4i_tcon.h"
+#include "sunxi_engine.h"
 
 #define SUN4I_TVE_EN_REG		0x000
 #define SUN4I_TVE_EN_DAC_MAP_MASK		GENMASK(19, 4)
@@ -353,7 +353,6 @@ static void sun4i_tv_disable(struct drm_encoder *encoder)
 	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
 	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
 	struct sun4i_tcon *tcon = crtc->tcon;
-	struct sun4i_backend *backend = crtc->backend;
 
 	DRM_DEBUG_DRIVER("Disabling the TV Output\n");
 
@@ -362,7 +361,9 @@ static void sun4i_tv_disable(struct drm_encoder *encoder)
 	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
 			   SUN4I_TVE_EN_ENABLE,
 			   0);
-	sun4i_backend_disable_color_correction(backend);
+
+	if (crtc->engine_ops->disable_color_correction)
+		crtc->engine_ops->disable_color_correction(crtc->engine);
 }
 
 static void sun4i_tv_enable(struct drm_encoder *encoder)
@@ -370,11 +371,11 @@ static void sun4i_tv_enable(struct drm_encoder *encoder)
 	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
 	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
 	struct sun4i_tcon *tcon = crtc->tcon;
-	struct sun4i_backend *backend = crtc->backend;
 
 	DRM_DEBUG_DRIVER("Enabling the TV Output\n");
 
-	sun4i_backend_apply_color_correction(backend);
+	if (crtc->engine_ops->apply_color_correction)
+		crtc->engine_ops->apply_color_correction(crtc->engine);
 
 	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
 			   SUN4I_TVE_EN_ENABLE,
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
new file mode 100644
index 000000000000..a9128abda66f
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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.
+ */
+
+#ifndef _SUNXI_ENGINE_H_
+#define _SUNXI_ENGINE_H_
+
+struct sun4i_crtc;
+
+struct sunxi_engine_ops {
+	/* Commit the changes to the engine */
+	void (*commit)(void *engine);
+	/* Initialize layers (planes) for this engine */
+	struct drm_plane **(*layers_init)(struct drm_device *drm,
+					  struct sun4i_crtc *crtc);
+
+	/*
+	 * These are optional functions for the TV Encoder. Please check
+	 * their presence before calling them.
+	 *
+	 * The first function applies the color space correction needed
+	 * for outputing correct TV signal.
+	 *
+	 * The second function disabled the correction.
+	 */
+	void (*apply_color_correction)(void *engine);
+	void (*disable_color_correction)(void *engine);
+};
+
+#endif /* _SUNXI_ENGINE_H_ */
-- 
2.12.2

[PATCH v4 06/11] drm/sun4i: add support for Allwinner DE2 mixers

[Icenowy Zheng]

Allwinner have a new "Display Engine 2.0" in their new SoCs, which comes
with mixers to do graphic processing and feed data to TCON, like the old
backends and frontends.

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

Currently a lot of functions are still missing -- more investigations
are needed to gain enough information for them.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Killed some dead code according to Jernej.

 drivers/gpu/drm/sun4i/Kconfig       |  10 +
 drivers/gpu/drm/sun4i/Makefile      |   4 +
 drivers/gpu/drm/sun4i/sun8i_layer.c | 142 ++++++++++++++
 drivers/gpu/drm/sun4i/sun8i_layer.h |  36 ++++
 drivers/gpu/drm/sun4i/sun8i_mixer.c | 381 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/sun4i/sun8i_mixer.h | 131 +++++++++++++
 6 files changed, 704 insertions(+)
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.c
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.h
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.c
 create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.h

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
index 5a8227f37cc4..15557484520d 100644
--- a/drivers/gpu/drm/sun4i/Kconfig
+++ b/drivers/gpu/drm/sun4i/Kconfig
@@ -22,3 +22,13 @@ config DRM_SUN4I_BACKEND
 	  original Allwinner Display Engine, which has a backend to
 	  do some alpha blending and feed graphics to TCON. If M is
 	  selected the module will be called sun4i-backend.
+
+config DRM_SUN4I_SUN8I_MIXER
+	tristate "Support for Allwinner Display Engine 2.0 Mixer"
+	depends on DRM_SUN4I
+	default MACH_SUN8I
+	help
+	  Choose this option if you have an Allwinner SoC with the
+	  Allwinner Display Engine 2.0, which has a mixer to do some
+	  graphics mixture and feed graphics to TCON, If M is
+	  selected the module will be called sun8i-mixer.
diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
index 1db1068b9be1..7625c2dad1bb 100644
--- a/drivers/gpu/drm/sun4i/Makefile
+++ b/drivers/gpu/drm/sun4i/Makefile
@@ -9,7 +9,11 @@ sun4i-tcon-y += sun4i_crtc.o
 sun4i-backend-y += sun4i_layer.o
 sun4i-backend-y += sun4i_backend.o
 
+sun8i-mixer-y += sun8i_layer.o
+sun8i-mixer-y += sun8i_mixer.o
+
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
 obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
+obj-$(CONFIG_DRM_SUN4I_SUN8I_MIXER) += sun8i-mixer.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
 obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.c b/drivers/gpu/drm/sun4i/sun8i_layer.c
new file mode 100644
index 000000000000..d70a90d963b0
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_layer.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
+ *
+ * Based on sun4i_layer.h, which is:
+ *   Copyright (C) 2015 Free Electrons
+ *   Copyright (C) 2015 NextThing Co
+ *
+ *   Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drmP.h>
+
+#include "sun4i_crtc.h"
+#include "sun8i_layer.h"
+#include "sun8i_mixer.h"
+
+struct sun8i_plane_desc {
+	       enum drm_plane_type     type;
+	       const uint32_t          *formats;
+	       uint32_t                nformats;
+};
+
+static int sun8i_mixer_layer_atomic_check(struct drm_plane *plane,
+					    struct drm_plane_state *state)
+{
+	return 0;
+}
+
+static void sun8i_mixer_layer_atomic_disable(struct drm_plane *plane,
+					       struct drm_plane_state *old_state)
+{
+	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
+	struct sun8i_mixer *mixer = layer->mixer;
+
+	sun8i_mixer_layer_enable(mixer, layer->id, false);
+}
+
+static void sun8i_mixer_layer_atomic_update(struct drm_plane *plane,
+					      struct drm_plane_state *old_state)
+{
+	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
+	struct sun8i_mixer *mixer = layer->mixer;
+
+	sun8i_mixer_update_layer_coord(mixer, layer->id, plane);
+	sun8i_mixer_update_layer_formats(mixer, layer->id, plane);
+	sun8i_mixer_update_layer_buffer(mixer, layer->id, plane);
+	sun8i_mixer_layer_enable(mixer, layer->id, true);
+}
+
+static struct drm_plane_helper_funcs sun8i_mixer_layer_helper_funcs = {
+	.atomic_check	= sun8i_mixer_layer_atomic_check,
+	.atomic_disable	= sun8i_mixer_layer_atomic_disable,
+	.atomic_update	= sun8i_mixer_layer_atomic_update,
+};
+
+static const struct drm_plane_funcs sun8i_mixer_layer_funcs = {
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.destroy		= drm_plane_cleanup,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.reset			= drm_atomic_helper_plane_reset,
+	.update_plane		= drm_atomic_helper_update_plane,
+};
+
+static const uint32_t sun8i_mixer_layer_formats[] = {
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_XRGB8888,
+};
+
+static const struct sun8i_plane_desc sun8i_mixer_planes[] = {
+	{
+		.type = DRM_PLANE_TYPE_PRIMARY,
+		.formats = sun8i_mixer_layer_formats,
+		.nformats = ARRAY_SIZE(sun8i_mixer_layer_formats),
+	},
+};
+
+static struct sun8i_layer *sun8i_layer_init_one(struct drm_device *drm,
+						struct sun8i_mixer *mixer,
+						const struct sun8i_plane_desc *plane)
+{
+	struct sun8i_layer *layer;
+	int ret;
+
+	layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
+	if (!layer)
+		return ERR_PTR(-ENOMEM);
+
+	/* possible crtcs are set later */
+	ret = drm_universal_plane_init(drm, &layer->plane, 0,
+				       &sun8i_mixer_layer_funcs,
+				       plane->formats, plane->nformats,
+				       plane->type, NULL);
+	if (ret) {
+		dev_err(drm->dev, "Couldn't initialize layer\n");
+		return ERR_PTR(ret);
+	}
+
+	drm_plane_helper_add(&layer->plane,
+			     &sun8i_mixer_layer_helper_funcs);
+	layer->mixer = mixer;
+
+	return layer;
+}
+
+struct drm_plane **sun8i_layers_init(struct drm_device *drm,
+				     struct sun4i_crtc *crtc)
+{
+	struct drm_plane **planes;
+	struct sun8i_mixer *mixer = crtc->engine;
+	int i;
+
+	planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun8i_mixer_planes) + 1,
+			      sizeof(*planes), GFP_KERNEL);
+	if (!planes)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < ARRAY_SIZE(sun8i_mixer_planes); i++) {
+		const struct sun8i_plane_desc *plane = &sun8i_mixer_planes[i];
+		struct sun8i_layer *layer;
+
+		layer = sun8i_layer_init_one(drm, mixer, plane);
+		if (IS_ERR(layer)) {
+			dev_err(drm->dev, "Couldn't initialize %s plane\n",
+				i ? "overlay" : "primary");
+			return ERR_CAST(layer);
+		};
+
+		layer->id = i;
+		planes[i] = &layer->plane;
+	};
+
+	return planes;
+}
diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.h b/drivers/gpu/drm/sun4i/sun8i_layer.h
new file mode 100644
index 000000000000..fe7e8a069d71
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_layer.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
+ *
+ * Based on sun4i_layer.h, which is:
+ *   Copyright (C) 2015 Free Electrons
+ *   Copyright (C) 2015 NextThing Co
+ *
+ *   Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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.
+ */
+
+#ifndef _SUN8I_LAYER_H_
+#define _SUN8I_LAYER_H_
+
+struct sun4i_crtc;
+
+struct sun8i_layer {
+	struct drm_plane	plane;
+	struct sun4i_drv	*drv;
+	struct sun8i_mixer	*mixer;
+	int			id;
+};
+
+static inline struct sun8i_layer *
+plane_to_sun8i_layer(struct drm_plane *plane)
+{
+	return container_of(plane, struct sun8i_layer, plane);
+}
+
+struct drm_plane **sun8i_layers_init(struct drm_device *drm,
+				     struct sun4i_crtc *crtc);
+#endif /* _SUN8I_LAYER_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
new file mode 100644
index 000000000000..5cff3f3833a7
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -0,0 +1,381 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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 "sun4i_drv.h"
+#include "sun8i_mixer.h"
+#include "sun8i_layer.h"
+#include "sunxi_engine.h"
+
+void sun8i_mixer_commit(void *mixer)
+{
+	struct sun8i_mixer *sun8i_mixer = mixer;
+
+	DRM_DEBUG_DRIVER("Committing changes\n");
+
+	regmap_write(sun8i_mixer->regs, SUN8I_MIXER_GLOBAL_DBUFF,
+		     SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
+}
+
+void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
+				int layer, bool enable)
+{
+	u32 val;
+	/* Currently the first UI channel is used */
+	int chan = mixer->cfg->vi_num;
+
+	DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
+
+	if (enable)
+		val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
+	else
+		val = 0;
+
+	regmap_update_bits(mixer->regs,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
+
+	/* Set the alpha configuration */
+	regmap_update_bits(mixer->regs,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF);
+	regmap_update_bits(mixer->regs,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF);
+}
+EXPORT_SYMBOL(sun8i_mixer_layer_enable);
+
+static int sun8i_mixer_drm_format_to_layer(struct drm_plane *plane,
+					     u32 format, u32 *mode)
+{
+	switch (format) {
+	case DRM_FORMAT_XRGB8888:
+		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888;
+		break;
+
+	case DRM_FORMAT_RGB888:
+		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
+				     int layer, struct drm_plane *plane)
+{
+	struct drm_plane_state *state = plane->state;
+	struct drm_framebuffer *fb = state->fb;
+	/* Currently the first UI channel is used */
+	int chan = mixer->cfg->vi_num;
+
+	DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
+
+	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
+		DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
+				 state->crtc_w, state->crtc_h);
+		regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_SIZE,
+			     SUN8I_MIXER_SIZE(state->crtc_w,
+					      state->crtc_h));
+		DRM_DEBUG_DRIVER("Updating blender size\n");
+		regmap_write(mixer->regs,
+			     SUN8I_MIXER_BLEND_ATTR_INSIZE(0),
+			     SUN8I_MIXER_SIZE(state->crtc_w,
+					      state->crtc_h));
+		regmap_write(mixer->regs, SUN8I_MIXER_BLEND_OUTSIZE,
+			     SUN8I_MIXER_SIZE(state->crtc_w,
+					      state->crtc_h));
+		DRM_DEBUG_DRIVER("Updating channel size\n");
+		regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_OVL_SIZE(chan),
+			     SUN8I_MIXER_SIZE(state->crtc_w,
+					      state->crtc_h));
+	}
+
+	/* Set the line width */
+	DRM_DEBUG_DRIVER("Layer line width: %d bytes\n", fb->pitches[0]);
+	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_PITCH(chan, layer),
+		     fb->pitches[0]);
+
+	/* Set height and width */
+	DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
+			 state->crtc_w, state->crtc_h);
+	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_SIZE(chan, layer),
+		     SUN8I_MIXER_SIZE(state->crtc_w, state->crtc_h));
+
+	/* Set base coordinates */
+	DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
+			 state->crtc_x, state->crtc_y);
+	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_COORD(chan, layer),
+		     SUN8I_MIXER_COORD(state->crtc_x, state->crtc_y));
+
+	return 0;
+}
+EXPORT_SYMBOL(sun8i_mixer_update_layer_coord);
+
+int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
+				       int layer, struct drm_plane *plane)
+{
+	struct drm_plane_state *state = plane->state;
+	struct drm_framebuffer *fb = state->fb;
+	bool interlaced = false;
+	u32 val;
+	/* Currently the first UI channel is used */
+	int chan = mixer->cfg->vi_num;
+	int ret;
+
+	if (plane->state->crtc)
+		interlaced = plane->state->crtc->state->adjusted_mode.flags
+			& DRM_MODE_FLAG_INTERLACE;
+
+	regmap_update_bits(mixer->regs, SUN8I_MIXER_BLEND_OUTCTL,
+			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
+			   interlaced ?
+			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED : 0);
+
+	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
+			 interlaced ? "on" : "off");
+
+	ret = sun8i_mixer_drm_format_to_layer(plane, fb->format->format,
+						&val);
+	if (ret) {
+		DRM_DEBUG_DRIVER("Invalid format\n");
+		return ret;
+	}
+
+	regmap_update_bits(mixer->regs,
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
+			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK, val);
+
+	return 0;
+}
+EXPORT_SYMBOL(sun8i_mixer_update_layer_formats);
+
+int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
+				      int layer, struct drm_plane *plane)
+{
+	struct drm_plane_state *state = plane->state;
+	struct drm_framebuffer *fb = state->fb;
+	struct drm_gem_cma_object *gem;
+	dma_addr_t paddr;
+	uint32_t paddr_u32;
+	/* Currently the first UI channel is used */
+	int chan = mixer->cfg->vi_num;
+	int bpp;
+
+	/* Get the physical address of the buffer in memory */
+	gem = drm_fb_cma_get_gem_obj(fb, 0);
+
+	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
+
+	/* Compute the start of the displayed memory */
+	bpp = fb->format->cpp[0];
+	paddr = gem->paddr + fb->offsets[0];
+	paddr += (state->src_x >> 16) * bpp;
+	paddr += (state->src_y >> 16) * fb->pitches[0];
+
+	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
+
+	paddr_u32 = (uint32_t) paddr;
+
+	regmap_write(mixer->regs,
+		     SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(chan, layer),
+		     paddr_u32);
+
+	return 0;
+}
+EXPORT_SYMBOL(sun8i_mixer_update_layer_buffer);
+
+static const struct sunxi_engine_ops sun8i_engine_ops = {
+	.commit = sun8i_mixer_commit,
+	.layers_init = sun8i_layers_init,
+};
+
+static struct regmap_config sun8i_mixer_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= 0xbfffc, /* guessed */
+};
+
+static int sun8i_mixer_bind(struct device *dev, struct device *master,
+			      void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = data;
+	struct sun4i_drv *drv = drm->dev_private;
+	struct sun8i_mixer *mixer;
+	struct resource *res;
+	void __iomem *regs;
+	int i, ret;
+
+	mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
+	if (!mixer)
+		return -ENOMEM;
+	dev_set_drvdata(dev, mixer);
+	drv->engine = mixer;
+	drv->engine_ops = &sun8i_engine_ops;
+
+	mixer->cfg = of_device_get_match_data(dev);
+	if (!mixer->cfg)
+		return -EINVAL;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	mixer->regs = devm_regmap_init_mmio(dev, regs,
+					      &sun8i_mixer_regmap_config);
+	if (IS_ERR(mixer->regs)) {
+		dev_err(dev, "Couldn't create the mixer regmap\n");
+		return PTR_ERR(mixer->regs);
+	}
+
+	mixer->reset = devm_reset_control_get(dev, NULL);
+	if (IS_ERR(mixer->reset)) {
+		dev_err(dev, "Couldn't get our reset line\n");
+		return PTR_ERR(mixer->reset);
+	}
+
+	ret = reset_control_deassert(mixer->reset);
+	if (ret) {
+		dev_err(dev, "Couldn't deassert our reset line\n");
+		return ret;
+	}
+
+	mixer->bus_clk = devm_clk_get(dev, "bus");
+	if (IS_ERR(mixer->bus_clk)) {
+		dev_err(dev, "Couldn't get the mixer bus clock\n");
+		ret = PTR_ERR(mixer->bus_clk);
+		goto err_assert_reset;
+	}
+	clk_prepare_enable(mixer->bus_clk);
+
+	mixer->mod_clk = devm_clk_get(dev, "mod");
+	if (IS_ERR(mixer->mod_clk)) {
+		dev_err(dev, "Couldn't get the mixer module clock\n");
+		ret = PTR_ERR(mixer->mod_clk);
+		goto err_disable_bus_clk;
+	}
+	clk_prepare_enable(mixer->mod_clk);
+
+	/* Reset the registers */
+	for (i = 0x0; i < 0x20000; i += 4)
+		regmap_write(mixer->regs, i, 0);
+
+	/* Enable the mixer */
+	regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_CTL,
+		     SUN8I_MIXER_GLOBAL_CTL_RT_EN);
+
+	/* Initialize blender */
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_FCOLOR_CTL,
+		     SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF);
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_PREMULTIPLY,
+		     SUN8I_MIXER_BLEND_PREMULTIPLY_DEF);
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_BKCOLOR,
+		     SUN8I_MIXER_BLEND_BKCOLOR_DEF);
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_MODE(0),
+		     SUN8I_MIXER_BLEND_MODE_DEF);
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_CK_CTL,
+		     SUN8I_MIXER_BLEND_CK_CTL_DEF);
+
+	regmap_write(mixer->regs,
+		     SUN8I_MIXER_BLEND_ATTR_FCOLOR(0),
+		     SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF);
+
+	/* Select the first UI channel */
+	DRM_DEBUG_DRIVER("Selecting channel %d (first UI channel)\n",
+			 mixer->cfg->vi_num);
+	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_ROUTE,
+		     mixer->cfg->vi_num);
+
+	return 0;
+
+	clk_disable_unprepare(mixer->mod_clk);
+err_disable_bus_clk:
+	clk_disable_unprepare(mixer->bus_clk);
+err_assert_reset:
+	reset_control_assert(mixer->reset);
+	return ret;
+}
+
+static void sun8i_mixer_unbind(struct device *dev, struct device *master,
+				 void *data)
+{
+	struct sun8i_mixer *mixer = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(mixer->mod_clk);
+	clk_disable_unprepare(mixer->bus_clk);
+	reset_control_assert(mixer->reset);
+}
+
+static const struct component_ops sun8i_mixer_ops = {
+	.bind	= sun8i_mixer_bind,
+	.unbind	= sun8i_mixer_unbind,
+};
+
+static int sun8i_mixer_probe(struct platform_device *pdev)
+{
+	return component_add(&pdev->dev, &sun8i_mixer_ops);
+}
+
+static int sun8i_mixer_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &sun8i_mixer_ops);
+
+	return 0;
+}
+
+static const struct sun8i_mixer_cfg sun8i_v3s_mixer_cfg = {
+	.vi_num = 2,
+	.ui_num = 1,
+};
+
+static const struct of_device_id sun8i_mixer_of_table[] = {
+	{
+		.compatible = "allwinner,sun8i-v3s-de2-mixer",
+		.data = &sun8i_v3s_mixer_cfg,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sun8i_mixer_of_table);
+
+static struct platform_driver sun8i_mixer_platform_driver = {
+	.probe		= sun8i_mixer_probe,
+	.remove		= sun8i_mixer_remove,
+	.driver		= {
+		.name		= "sun8i-mixer",
+		.of_match_table	= sun8i_mixer_of_table,
+	},
+};
+module_platform_driver(sun8i_mixer_platform_driver);
+
+MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
+MODULE_DESCRIPTION("Allwinner DE2 Mixer driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
new file mode 100644
index 000000000000..a4a365ae44c9
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * 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.
+ */
+
+#ifndef _SUN8I_MIXER_H_
+#define _SUN8I_MIXER_H_
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include "sun4i_layer.h"
+
+#define SUN8I_MIXER_MAX_CHAN_COUNT		4
+
+#define SUN8I_MIXER_SIZE(w, h)			(((h) - 1) << 16 | ((w) - 1))
+#define SUN8I_MIXER_COORD(x, y)			((y) << 16 | (x))
+
+#define SUN8I_MIXER_GLOBAL_CTL			0x0
+#define SUN8I_MIXER_GLOBAL_STATUS		0x4
+#define SUN8I_MIXER_GLOBAL_DBUFF		0x8
+#define SUN8I_MIXER_GLOBAL_SIZE			0xc
+
+#define SUN8I_MIXER_GLOBAL_CTL_RT_EN		0x1
+
+#define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE		0x1
+
+#define SUN8I_MIXER_BLEND_FCOLOR_CTL		0x1000
+#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)	(0x1004 + 0x10 * (x) + 0x0)
+#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)	(0x1004 + 0x10 * (x) + 0x4)
+#define SUN8I_MIXER_BLEND_ATTR_OFFSET(x)	(0x1004 + 0x10 * (x) + 0x8)
+#define SUN8I_MIXER_BLEND_ROUTE			0x1080
+#define SUN8I_MIXER_BLEND_PREMULTIPLY		0x1084
+#define SUN8I_MIXER_BLEND_BKCOLOR		0x1088
+#define SUN8I_MIXER_BLEND_OUTSIZE		0x108c
+#define SUN8I_MIXER_BLEND_MODE(x)		(0x1090 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_CK_CTL		0x10b0
+#define SUN8I_MIXER_BLEND_CK_CFG		0x10b4
+#define SUN8I_MIXER_BLEND_CK_MAX(x)		(0x10c0 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_CK_MIN(x)		(0x10e0 + 0x04 * (x))
+#define SUN8I_MIXER_BLEND_OUTCTL		0x10fc
+
+/* The following numbers are some still unknown magic numbers */
+#define SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF	0xff000000
+#define SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF	0x00000101
+#define SUN8I_MIXER_BLEND_PREMULTIPLY_DEF	0x0
+#define SUN8I_MIXER_BLEND_BKCOLOR_DEF		0xff000000
+#define SUN8I_MIXER_BLEND_MODE_DEF		0x03010301
+#define SUN8I_MIXER_BLEND_CK_CTL_DEF		0x0
+
+#define SUN8I_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
+
+/*
+ * VI channels are not used now, but the support of them may be introduced in
+ * the future.
+ */
+
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x0)
+#define SUN8I_MIXER_CHAN_UI_LAYER_SIZE(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x4)
+#define SUN8I_MIXER_CHAN_UI_LAYER_COORD(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_PITCH(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0xc)
+#define SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x10)
+#define SUN8I_MIXER_CHAN_UI_LAYER_BOT_LADDR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x14)
+#define SUN8I_MIXER_CHAN_UI_LAYER_FCOLOR(ch, layer) \
+			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x18)
+#define SUN8I_MIXER_CHAN_UI_TOP_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x80)
+#define SUN8I_MIXER_CHAN_UI_BOT_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x84)
+#define SUN8I_MIXER_CHAN_UI_OVL_SIZE(ch)	(0x2000 + 0x1000 * (ch) + 0x88)
+
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN		BIT(0)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK	GENMASK(11, 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF	(1 << 1)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888	(0 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888	(4 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888	(8 << 8)
+#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF	(0xff << 24)
+
+/*
+ * These sub-engines are still unknown now, the EN registers are here only to
+ * be used to disable these sub-engines.
+ */
+#define SUN8I_MIXER_VSU_EN			0x20000
+#define SUN8I_MIXER_GSU1_EN			0x30000
+#define SUN8I_MIXER_GSU2_EN			0x40000
+#define SUN8I_MIXER_GSU3_EN			0x50000
+#define SUN8I_MIXER_FCE_EN			0xa0000
+#define SUN8I_MIXER_BWS_EN			0xa2000
+#define SUN8I_MIXER_LTI_EN			0xa4000
+#define SUN8I_MIXER_PEAK_EN			0xa6000
+#define SUN8I_MIXER_ASE_EN			0xa8000
+#define SUN8I_MIXER_FCC_EN			0xaa000
+#define SUN8I_MIXER_DCSC_EN			0xb0000
+
+struct sun8i_mixer_cfg {
+	int		vi_num;
+	int		ui_num;
+};
+
+struct sun8i_mixer {
+	struct regmap			*regs;
+
+	const struct sun8i_mixer_cfg	*cfg;
+
+	struct reset_control		*reset;
+
+	struct clk			*bus_clk;
+	struct clk			*mod_clk;
+};
+
+void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
+				int layer, bool enable);
+int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
+				     int layer, struct drm_plane *plane);
+int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
+				       int layer, struct drm_plane *plane);
+int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
+				      int layer, struct drm_plane *plane);
+#endif /* _SUN8I_MIXER_H_ */
-- 
2.12.2

[PATCH v4 07/11] drm/sun4i: Add compatible string for V3s display engine

[Icenowy Zheng]

Allwinner V3s features the new "Display Engine 2.0", which can now also
be driven with our subdrivers in sun4i-drm.

Add the compatible string for in sun4i_drv.c, in order to make the
display engine and its components probed.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 8ddd72cd5873..68c0b754cdb5 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -294,6 +294,7 @@ static const struct of_device_id sun4i_drv_of_table[] = {
 	{ .compatible = "allwinner,sun6i-a31-display-engine" },
 	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
 	{ .compatible = "allwinner,sun8i-a33-display-engine" },
+	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
-- 
2.12.2

[PATCH v4 08/11] drm/sun4i: tcon: add support for V3s TCON

[Icenowy Zheng]

Allwinner V3s SoC features a TCON without channel 1.

Add support for it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c  | 3 ++-
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 68c0b754cdb5..736b28e47281 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -176,7 +176,8 @@ static bool sun4i_drv_node_is_tcon(struct device_node *node)
 	return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 		of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
 		of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
-		of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
+		of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") ||
+		of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon");
 }
 
 static int compare_of(struct device *dev, void *data)
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index f50ecb75c177..e85a726a9c36 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -533,11 +533,16 @@ static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
 	/* nothing is supported */
 };
 
+static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
+	/* nothing is supported */
+};
+
 static const struct of_device_id sun4i_tcon_of_table[] = {
 	{ .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
 	{ .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
 	{ .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
 	{ .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
+	{ .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
-- 
2.12.2

[PATCH v4 09/11] ARM: dts: sun8i: add DE2 nodes for V3s SoC

[Icenowy Zheng]

Allwinner V3s SoC features a "Display Engine 2.0" with only one TCON
which have RGB LCD output.

Add device nodes for it as well as the TCON.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
Changes in v4:
- Dropped leading 0's in unit name.
Changes in v3:
- Change the size of de2_clocks regs according to the binding example.

 arch/arm/boot/dts/sun8i-v3s.dtsi | 87 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi b/arch/arm/boot/dts/sun8i-v3s.dtsi
index 71075969e5e6..ae23746731a8 100644
--- a/arch/arm/boot/dts/sun8i-v3s.dtsi
+++ b/arch/arm/boot/dts/sun8i-v3s.dtsi
@@ -41,6 +41,10 @@
  */
 
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/clock/sun8i-v3s-ccu.h>
+#include <dt-bindings/clock/sun8i-de2.h>
+#include <dt-bindings/reset/sun8i-v3s-ccu.h>
+#include <dt-bindings/reset/sun8i-de2.h>
 
 / {
 	#address-cells = <1>;
@@ -59,6 +63,12 @@
 		};
 	};
 
+	de: display-engine {
+		compatible = "allwinner,sun8i-v3s-display-engine";
+		allwinner,pipelines = <&de2_mixer0>;
+		status = "disabled";
+	};
+
 	timer {
 		compatible = "arm,armv7-timer";
 		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
@@ -93,6 +103,83 @@
 		#size-cells = <1>;
 		ranges;
 
+		de2_clocks: clock@1000000 {
+			compatible = "allwinner,sun50i-h5-de2-clk";
+			reg = <0x01000000 0x100000>;
+			clocks = <&ccu CLK_DE>,
+				 <&ccu CLK_BUS_DE>;
+			clock-names = "mod",
+				      "bus";
+			resets = <&ccu RST_BUS_DE>;
+			#clock-cells = <1>;
+			#reset-cells = <1>;
+		};
+
+		de2_mixer0: mixer@1100000 {
+			compatible = "allwinner,sun8i-v3s-de2-mixer";
+			reg = <0x01100000 0x100000>;
+			clocks = <&de2_clocks CLK_MIXER0>,
+				 <&de2_clocks CLK_BUS_MIXER0>;
+			clock-names = "mod",
+				      "bus";
+			resets = <&de2_clocks RST_MIXER0>;
+			assigned-clocks = <&de2_clocks CLK_MIXER0>;
+			assigned-clock-rates = <150000000>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				mixer0_out: port@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+
+					mixer0_out_tcon0: endpoint@0 {
+						reg = <0>;
+						remote-endpoint = <&tcon0_in_mixer0>;
+					};
+				};
+			};
+		};
+
+		tcon0: lcd-controller@1c0c000 {
+			compatible = "allwinner,sun8i-v3s-tcon";
+			reg = <0x01c0c000 0x1000>;
+			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_TCON0>,
+				 <&ccu CLK_TCON0>;
+			clock-names = "ahb",
+				      "tcon-ch0";
+			clock-output-names = "tcon-pixel-clock";
+			resets = <&ccu RST_BUS_TCON0>;
+			reset-names = "lcd";
+			status = "disabled";
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				tcon0_in: port@0 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <0>;
+
+					tcon0_in_mixer0: endpoint@0 {
+						reg = <0>;
+						remote-endpoint = <&mixer0_out_tcon0>;
+					};
+				};
+
+				tcon0_out: port@1 {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					reg = <1>;
+				};
+			};
+		};
+
+
 		mmc0: mmc@01c0f000 {
 			compatible = "allwinner,sun7i-a20-mmc";
 			reg = <0x01c0f000 0x1000>;
-- 
2.12.2

[PATCH v4 10/11] ARM: dts: sun8i: add pinmux for LCD pins of V3s SoC

[Icenowy Zheng]

Allwinner V3s SoC features a set of pins that have functionality of RGB
LCD, the pins are at different pin ban than other SoCs.

Add pinctrl node for them.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 arch/arm/boot/dts/sun8i-v3s.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi b/arch/arm/boot/dts/sun8i-v3s.dtsi
index ae23746731a8..ac783a8a4fd3 100644
--- a/arch/arm/boot/dts/sun8i-v3s.dtsi
+++ b/arch/arm/boot/dts/sun8i-v3s.dtsi
@@ -297,6 +297,15 @@
 				function = "i2c0";
 			};
 
+			lcd_rgb666_pins: lcd_rgb666@0 {
+				pins = "PE0", "PE1", "PE2", "PE3", "PE4",
+				       "PE5", "PE6", "PE7", "PE8", "PE9",
+				       "PE10", "PE11", "PE12", "PE13", "PE14",
+				       "PE15", "PE16", "PE17", "PE18", "PE19",
+				       "PE23", "PE24";
+				function = "lcd";
+			};
+
 			uart0_pins_a: uart0@0 {
 				pins = "PB8", "PB9";
 				function = "uart0";
-- 
2.12.2

[PATCH v4 11/11] [DO NOT MERGE] ARM: dts: sun8i: enable LCD panel of Lichee Pi Zero

[Icenowy Zheng]

A 480x272 QiaoDian QD43003C0-40-7LED panel is available from Lichee Pi.

This commit connects this panel to Lichee Pi Zero.

Lichee Pi also provides a 800x480 panel without accurate model number,
so do not merge this patch. It will finally come as device tree overlay.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts | 36 +++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts b/arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts
index 387fc2aa546d..7ae72bf63cd0 100644
--- a/arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts
+++ b/arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts
@@ -75,6 +75,28 @@
 			gpios = <&pio 6 2 GPIO_ACTIVE_LOW>; /* PG2 */
 		};
 	};
+
+	panel: panel {
+		compatible = "qiaodian,qd43003c0-40", "simple-panel";
+		enable-gpios = <&pio 1 4 GPIO_ACTIVE_HIGH>; /* Should be backlight */
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			panel_input: endpoint@0 {
+				reg = <0>;
+				remote-endpoint = <&tcon0_out_lcd>;
+			};
+		};
+	};
+};
+
+&de {
+	status = "okay";
 };
 
 &mmc0 {
@@ -86,6 +108,20 @@
 	status = "okay";
 };
 
+&tcon0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&lcd_rgb666_pins>;
+	status = "okay";
+
+};
+
+&tcon0_out {
+	tcon0_out_lcd: endpoint@0 {
+		reg = <0>;
+		remote-endpoint = <&panel_input>;
+	};
+};
+
 &uart0 {
 	pinctrl-0 = <&uart0_pins_a>;
 	pinctrl-names = "default";
-- 
2.12.2

Re: [PATCH v4 05/11] drm/sun4i: abstract a engine type

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 8531 bytes --]

Hi,

Thanks for that rework.

On Sun, Apr 16, 2017 at 08:08:43PM +0800, Icenowy Zheng wrote:
> As we are going to add support for the Allwinner DE2 engine in sun4i-drm
> driver, we will finally have two types of display engines -- the DE1
> backend and the DE2 mixer. They both do some display blending and feed
> graphics data to TCON, so I choose to call them both "engine" here.
> 
> Abstract the engine type to void * and a ops struct, which contains
> functions that should be called outside the engine-specified code (in
> TCON, CRTC or TV Encoder code).
> 
> A dedicated Kconfig option is also added to control whether
> sun4i-backend-specified code (sun4i_backend.c and sun4i_layer.c) should
> be built. As we removed the codes in CRTC code that directly call the
> layer code, we can now extract the layer part and combine it with the
> backend part into a new module, sun4i-backend.ko.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> Changes in v4:
> - Comments to tag the color correction functions as optional.
> - Check before calling the optional functions.
> - Change layers_init to satisfy new PATCH v4 04/11.
> 
>  drivers/gpu/drm/sun4i/Kconfig         | 10 ++++++++++
>  drivers/gpu/drm/sun4i/Makefile        |  6 ++++--
>  drivers/gpu/drm/sun4i/sun4i_backend.c | 26 +++++++++++++++++++-------
>  drivers/gpu/drm/sun4i/sun4i_backend.h |  5 -----
>  drivers/gpu/drm/sun4i/sun4i_crtc.c    | 14 +++++++-------
>  drivers/gpu/drm/sun4i/sun4i_crtc.h    |  7 ++++---
>  drivers/gpu/drm/sun4i/sun4i_drv.h     |  3 ++-
>  drivers/gpu/drm/sun4i/sun4i_layer.c   |  2 +-
>  drivers/gpu/drm/sun4i/sun4i_layer.h   |  3 ++-
>  drivers/gpu/drm/sun4i/sun4i_tcon.c    |  2 +-
>  drivers/gpu/drm/sun4i/sun4i_tv.c      | 11 ++++++-----
>  drivers/gpu/drm/sun4i/sunxi_engine.h  | 35 +++++++++++++++++++++++++++++++++++
>  12 files changed, 91 insertions(+), 33 deletions(-)
>  create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h
> 
> diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
> index a4b357db8856..5a8227f37cc4 100644
> --- a/drivers/gpu/drm/sun4i/Kconfig
> +++ b/drivers/gpu/drm/sun4i/Kconfig
> @@ -12,3 +12,13 @@ config DRM_SUN4I
>  	  Choose this option if you have an Allwinner SoC with a
>  	  Display Engine. If M is selected the module will be called
>  	  sun4i-drm.
> +
> +config DRM_SUN4I_BACKEND
> +	tristate "Support for Allwinner A10 Display Engine Backend"
> +	depends on DRM_SUN4I
> +	default DRM_SUN4I
> +	help
> +	  Choose this option if you have an Allwinner SoC with the
> +	  original Allwinner Display Engine, which has a backend to
> +	  do some alpha blending and feed graphics to TCON. If M is
> +	  selected the module will be called sun4i-backend.
> diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
> index 59b757350a1f..1db1068b9be1 100644
> --- a/drivers/gpu/drm/sun4i/Makefile
> +++ b/drivers/gpu/drm/sun4i/Makefile
> @@ -5,9 +5,11 @@ sun4i-tcon-y += sun4i_tcon.o
>  sun4i-tcon-y += sun4i_rgb.o
>  sun4i-tcon-y += sun4i_dotclock.o
>  sun4i-tcon-y += sun4i_crtc.o
> -sun4i-tcon-y += sun4i_layer.o
> +
> +sun4i-backend-y += sun4i_layer.o
> +sun4i-backend-y += sun4i_backend.o
>  
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
> -obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
> +obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index d660741ba475..a16c96a002a4 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -23,6 +23,8 @@
>  
>  #include "sun4i_backend.h"
>  #include "sun4i_drv.h"
> +#include "sun4i_layer.h"
> +#include "sunxi_engine.h"
>  
>  static const u32 sunxi_rgb2yuv_coef[12] = {
>  	0x00000107, 0x00000204, 0x00000064, 0x00000108,
> @@ -30,9 +32,10 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
>  	0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
>  };
>  
> -void sun4i_backend_apply_color_correction(struct sun4i_backend *backend)
> +static void sun4i_backend_apply_color_correction(void *engine)
>  {
>  	int i;
> +	struct sun4i_backend *backend = engine;

I'm not really fond of passing an opaque pointer here, and hope that
things will work out.

I think having a common structure, holding the common thingsand a more
specific structure for that one would work better.

Something like

struct sunxi_engine {
       struct regmap	*regs;
};

struct sun4i_backend {
       struct sunxi_engine	engine;

	struct clk		*sat_clk;
	struct reset_control	*sat_reset;
	
};

static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
       struct sun4i_backend *backend = container_of(engine, struct sun4i_backend, engine);

...

> +static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
> +	.commit = sun4i_backend_commit,
> +	.layers_init = sun4i_layers_init,
> +	.apply_color_correction = sun4i_backend_apply_color_correction,
> +	.disable_color_correction = sun4i_backend_disable_color_correction,

Please align the values with tabs, like done in the other structures
created that way in this driver.

>  static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
> @@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
>  
>  	DRM_DEBUG_DRIVER("Committing plane changes\n");
>  
> -	sun4i_backend_commit(scrtc->backend);
> +	scrtc->engine_ops->commit(scrtc->engine);

You rely on the backend having setup things properly, which is pretty
fragile. Ideally, you should have a function to check that engine_ops
and commit is !NULL, and call it, and the consumers would use that
function...

> @@ -362,7 +361,9 @@ static void sun4i_tv_disable(struct drm_encoder *encoder)
>  	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
>  			   SUN4I_TVE_EN_ENABLE,
>  			   0);
> -	sun4i_backend_disable_color_correction(backend);
> +
> +	if (crtc->engine_ops->disable_color_correction)
> +		crtc->engine_ops->disable_color_correction(crtc->engine);
>  }

... Instead of having to do it in some cases, but not always ...

>  static void sun4i_tv_enable(struct drm_encoder *encoder)
> @@ -370,11 +371,11 @@ static void sun4i_tv_enable(struct drm_encoder *encoder)
>  	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
>  	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
>  	struct sun4i_tcon *tcon = crtc->tcon;
> -	struct sun4i_backend *backend = crtc->backend;
>  
>  	DRM_DEBUG_DRIVER("Enabling the TV Output\n");
>  
> -	sun4i_backend_apply_color_correction(backend);
> +	if (crtc->engine_ops->apply_color_correction)
> +		crtc->engine_ops->apply_color_correction(crtc->engine);
>  
>  	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
>  			   SUN4I_TVE_EN_ENABLE,
> diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
> new file mode 100644
> index 000000000000..a9128abda66f
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
> @@ -0,0 +1,35 @@
> +/*
> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
> + *
> + * 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.
> + */
> +
> +#ifndef _SUNXI_ENGINE_H_
> +#define _SUNXI_ENGINE_H_
> +
> +struct sun4i_crtc;
> +
> +struct sunxi_engine_ops {
> +	/* Commit the changes to the engine */
> +	void (*commit)(void *engine);
> +	/* Initialize layers (planes) for this engine */
> +	struct drm_plane **(*layers_init)(struct drm_device *drm,
> +					  struct sun4i_crtc *crtc);
> +
> +	/*
> +	 * These are optional functions for the TV Encoder. Please check
> +	 * their presence before calling them.
> +	 *
> +	 * The first function applies the color space correction needed
> +	 * for outputing correct TV signal.
> +	 *
> +	 * The second function disabled the correction.
> +	 */
> +	void (*apply_color_correction)(void *engine);
> +	void (*disable_color_correction)(void *engine);

... And have to document it.

Please also use kerneldoc for those comments.

Thanks again!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v4 06/11] drm/sun4i: add support for Allwinner DE2 mixers

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 27176 bytes --]

On Sun, Apr 16, 2017 at 08:08:44PM +0800, Icenowy Zheng wrote:
> Allwinner have a new "Display Engine 2.0" in their new SoCs, which comes
> with mixers to do graphic processing and feed data to TCON, like the old
> backends and frontends.
> 
> Add support for the mixer on Allwinner V3s SoC; it's the simplest one.
> 
> Currently a lot of functions are still missing -- more investigations
> are needed to gain enough information for them.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> Changes in v4:
> - Killed some dead code according to Jernej.
> 
>  drivers/gpu/drm/sun4i/Kconfig       |  10 +
>  drivers/gpu/drm/sun4i/Makefile      |   4 +
>  drivers/gpu/drm/sun4i/sun8i_layer.c | 142 ++++++++++++++
>  drivers/gpu/drm/sun4i/sun8i_layer.h |  36 ++++
>  drivers/gpu/drm/sun4i/sun8i_mixer.c | 381 ++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/sun4i/sun8i_mixer.h | 131 +++++++++++++
>  6 files changed, 704 insertions(+)
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.c
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.h
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.c
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.h
> 
> diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
> index 5a8227f37cc4..15557484520d 100644
> --- a/drivers/gpu/drm/sun4i/Kconfig
> +++ b/drivers/gpu/drm/sun4i/Kconfig
> @@ -22,3 +22,13 @@ config DRM_SUN4I_BACKEND
>  	  original Allwinner Display Engine, which has a backend to
>  	  do some alpha blending and feed graphics to TCON. If M is
>  	  selected the module will be called sun4i-backend.
> +
> +config DRM_SUN4I_SUN8I_MIXER
> +	tristate "Support for Allwinner Display Engine 2.0 Mixer"
> +	depends on DRM_SUN4I
> +	default MACH_SUN8I
> +	help
> +	  Choose this option if you have an Allwinner SoC with the
> +	  Allwinner Display Engine 2.0, which has a mixer to do some
> +	  graphics mixture and feed graphics to TCON, If M is
> +	  selected the module will be called sun8i-mixer.
> diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
> index 1db1068b9be1..7625c2dad1bb 100644
> --- a/drivers/gpu/drm/sun4i/Makefile
> +++ b/drivers/gpu/drm/sun4i/Makefile
> @@ -9,7 +9,11 @@ sun4i-tcon-y += sun4i_crtc.o
>  sun4i-backend-y += sun4i_layer.o
>  sun4i-backend-y += sun4i_backend.o
>  
> +sun8i-mixer-y += sun8i_layer.o
> +sun8i-mixer-y += sun8i_mixer.o
> +
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
>  obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
> +obj-$(CONFIG_DRM_SUN4I_SUN8I_MIXER) += sun8i-mixer.o

Please align the value using tabs.

>  obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
> diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.c b/drivers/gpu/drm/sun4i/sun8i_layer.c
> new file mode 100644
> index 000000000000..d70a90d963b0
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sun8i_layer.c
> @@ -0,0 +1,142 @@
> +/*
> + * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
> + *
> + * Based on sun4i_layer.h, which is:
> + *   Copyright (C) 2015 Free Electrons
> + *   Copyright (C) 2015 NextThing Co
> + *
> + *   Maxime Ripard <maxime.ripard@free-electrons.com>
> + *
> + * 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/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drmP.h>
> +
> +#include "sun4i_crtc.h"
> +#include "sun8i_layer.h"
> +#include "sun8i_mixer.h"
> +
> +struct sun8i_plane_desc {
> +	       enum drm_plane_type     type;
> +	       const uint32_t          *formats;
> +	       uint32_t                nformats;
> +};
> +
> +static int sun8i_mixer_layer_atomic_check(struct drm_plane *plane,
> +					    struct drm_plane_state *state)
> +{
> +	return 0;
> +}
> +
> +static void sun8i_mixer_layer_atomic_disable(struct drm_plane *plane,
> +					       struct drm_plane_state *old_state)
> +{
> +	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
> +	struct sun8i_mixer *mixer = layer->mixer;
> +
> +	sun8i_mixer_layer_enable(mixer, layer->id, false);
> +}
> +
> +static void sun8i_mixer_layer_atomic_update(struct drm_plane *plane,
> +					      struct drm_plane_state *old_state)
> +{
> +	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
> +	struct sun8i_mixer *mixer = layer->mixer;
> +
> +	sun8i_mixer_update_layer_coord(mixer, layer->id, plane);
> +	sun8i_mixer_update_layer_formats(mixer, layer->id, plane);
> +	sun8i_mixer_update_layer_buffer(mixer, layer->id, plane);
> +	sun8i_mixer_layer_enable(mixer, layer->id, true);
> +}
> +
> +static struct drm_plane_helper_funcs sun8i_mixer_layer_helper_funcs = {
> +	.atomic_check	= sun8i_mixer_layer_atomic_check,
> +	.atomic_disable	= sun8i_mixer_layer_atomic_disable,
> +	.atomic_update	= sun8i_mixer_layer_atomic_update,
> +};
> +
> +static const struct drm_plane_funcs sun8i_mixer_layer_funcs = {
> +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
> +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
> +	.destroy		= drm_plane_cleanup,
> +	.disable_plane		= drm_atomic_helper_disable_plane,
> +	.reset			= drm_atomic_helper_plane_reset,
> +	.update_plane		= drm_atomic_helper_update_plane,
> +};
> +
> +static const uint32_t sun8i_mixer_layer_formats[] = {
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static const struct sun8i_plane_desc sun8i_mixer_planes[] = {
> +	{
> +		.type = DRM_PLANE_TYPE_PRIMARY,
> +		.formats = sun8i_mixer_layer_formats,
> +		.nformats = ARRAY_SIZE(sun8i_mixer_layer_formats),
> +	},
> +};
> +
> +static struct sun8i_layer *sun8i_layer_init_one(struct drm_device *drm,
> +						struct sun8i_mixer *mixer,
> +						const struct sun8i_plane_desc *plane)
> +{
> +	struct sun8i_layer *layer;
> +	int ret;
> +
> +	layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
> +	if (!layer)
> +		return ERR_PTR(-ENOMEM);
> +
> +	/* possible crtcs are set later */
> +	ret = drm_universal_plane_init(drm, &layer->plane, 0,
> +				       &sun8i_mixer_layer_funcs,
> +				       plane->formats, plane->nformats,
> +				       plane->type, NULL);
> +	if (ret) {
> +		dev_err(drm->dev, "Couldn't initialize layer\n");
> +		return ERR_PTR(ret);
> +	}
> +
> +	drm_plane_helper_add(&layer->plane,
> +			     &sun8i_mixer_layer_helper_funcs);
> +	layer->mixer = mixer;
> +
> +	return layer;
> +}
> +
> +struct drm_plane **sun8i_layers_init(struct drm_device *drm,
> +				     struct sun4i_crtc *crtc)
> +{
> +	struct drm_plane **planes;
> +	struct sun8i_mixer *mixer = crtc->engine;
> +	int i;
> +
> +	planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun8i_mixer_planes) + 1,
> +			      sizeof(*planes), GFP_KERNEL);
> +	if (!planes)
> +		return ERR_PTR(-ENOMEM);
> +
> +	for (i = 0; i < ARRAY_SIZE(sun8i_mixer_planes); i++) {
> +		const struct sun8i_plane_desc *plane = &sun8i_mixer_planes[i];
> +		struct sun8i_layer *layer;
> +
> +		layer = sun8i_layer_init_one(drm, mixer, plane);
> +		if (IS_ERR(layer)) {
> +			dev_err(drm->dev, "Couldn't initialize %s plane\n",
> +				i ? "overlay" : "primary");
> +			return ERR_CAST(layer);
> +		};
> +
> +		layer->id = i;
> +		planes[i] = &layer->plane;
> +	};
> +
> +	return planes;
> +}
> diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.h b/drivers/gpu/drm/sun4i/sun8i_layer.h
> new file mode 100644
> index 000000000000..fe7e8a069d71
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sun8i_layer.h
> @@ -0,0 +1,36 @@
> +/*
> + * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
> + *
> + * Based on sun4i_layer.h, which is:
> + *   Copyright (C) 2015 Free Electrons
> + *   Copyright (C) 2015 NextThing Co
> + *
> + *   Maxime Ripard <maxime.ripard@free-electrons.com>
> + *
> + * 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.
> + */
> +
> +#ifndef _SUN8I_LAYER_H_
> +#define _SUN8I_LAYER_H_
> +
> +struct sun4i_crtc;
> +
> +struct sun8i_layer {
> +	struct drm_plane	plane;
> +	struct sun4i_drv	*drv;
> +	struct sun8i_mixer	*mixer;
> +	int			id;
> +};
> +
> +static inline struct sun8i_layer *
> +plane_to_sun8i_layer(struct drm_plane *plane)
> +{
> +	return container_of(plane, struct sun8i_layer, plane);
> +}
> +
> +struct drm_plane **sun8i_layers_init(struct drm_device *drm,
> +				     struct sun4i_crtc *crtc);
> +#endif /* _SUN8I_LAYER_H_ */
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> new file mode 100644
> index 000000000000..5cff3f3833a7
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> @@ -0,0 +1,381 @@
> +/*
> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
> + *
> + * 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 "sun4i_drv.h"
> +#include "sun8i_mixer.h"
> +#include "sun8i_layer.h"
> +#include "sunxi_engine.h"
> +
> +void sun8i_mixer_commit(void *mixer)
> +{
> +	struct sun8i_mixer *sun8i_mixer = mixer;
> +
> +	DRM_DEBUG_DRIVER("Committing changes\n");
> +
> +	regmap_write(sun8i_mixer->regs, SUN8I_MIXER_GLOBAL_DBUFF,
> +		     SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
> +}
> +
> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> +				int layer, bool enable)
> +{
> +	u32 val;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +
> +	DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
> +
> +	if (enable)
> +		val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
> +	else
> +		val = 0;
> +
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
> +
> +	/* Set the alpha configuration */
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF);
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF);
> +}
> +EXPORT_SYMBOL(sun8i_mixer_layer_enable);

Why do you need to export it?

> +
> +static int sun8i_mixer_drm_format_to_layer(struct drm_plane *plane,
> +					     u32 format, u32 *mode)
> +{
> +	switch (format) {
> +	case DRM_FORMAT_XRGB8888:
> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888;
> +		break;
> +
> +	case DRM_FORMAT_RGB888:
> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
> +				     int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +
> +	DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
> +
> +	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
> +		DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
> +				 state->crtc_w, state->crtc_h);
> +		regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_SIZE,
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +		DRM_DEBUG_DRIVER("Updating blender size\n");
> +		regmap_write(mixer->regs,
> +			     SUN8I_MIXER_BLEND_ATTR_INSIZE(0),
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +		regmap_write(mixer->regs, SUN8I_MIXER_BLEND_OUTSIZE,
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +		DRM_DEBUG_DRIVER("Updating channel size\n");
> +		regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_OVL_SIZE(chan),
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +	}
> +
> +	/* Set the line width */
> +	DRM_DEBUG_DRIVER("Layer line width: %d bytes\n", fb->pitches[0]);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_PITCH(chan, layer),
> +		     fb->pitches[0]);
> +
> +	/* Set height and width */
> +	DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
> +			 state->crtc_w, state->crtc_h);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_SIZE(chan, layer),
> +		     SUN8I_MIXER_SIZE(state->crtc_w, state->crtc_h));
> +
> +	/* Set base coordinates */
> +	DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
> +			 state->crtc_x, state->crtc_y);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_COORD(chan, layer),
> +		     SUN8I_MIXER_COORD(state->crtc_x, state->crtc_y));
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_coord);
> +
> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
> +				       int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	bool interlaced = false;
> +	u32 val;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +	int ret;
> +
> +	if (plane->state->crtc)
> +		interlaced = plane->state->crtc->state->adjusted_mode.flags
> +			& DRM_MODE_FLAG_INTERLACE;
> +
> +	regmap_update_bits(mixer->regs, SUN8I_MIXER_BLEND_OUTCTL,
> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
> +			   interlaced ?
> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED : 0);
> +
> +	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
> +			 interlaced ? "on" : "off");

You're not using interlaced anywhere.

> +
> +	ret = sun8i_mixer_drm_format_to_layer(plane, fb->format->format,
> +						&val);
> +	if (ret) {
> +		DRM_DEBUG_DRIVER("Invalid format\n");
> +		return ret;
> +	}
> +
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK, val);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_formats);
> +
> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
> +				      int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct drm_gem_cma_object *gem;
> +	dma_addr_t paddr;
> +	uint32_t paddr_u32;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +	int bpp;
> +
> +	/* Get the physical address of the buffer in memory */
> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
> +
> +	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
> +
> +	/* Compute the start of the displayed memory */
> +	bpp = fb->format->cpp[0];
> +	paddr = gem->paddr + fb->offsets[0];
> +	paddr += (state->src_x >> 16) * bpp;
> +	paddr += (state->src_y >> 16) * fb->pitches[0];
> +
> +	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
> +
> +	paddr_u32 = (uint32_t) paddr;

How does that work on 64-bits systems ?

> +
> +	regmap_write(mixer->regs,
> +		     SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(chan, layer),
> +		     paddr_u32);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_buffer);
> +
> +static const struct sunxi_engine_ops sun8i_engine_ops = {
> +	.commit = sun8i_mixer_commit,
> +	.layers_init = sun8i_layers_init,

Align with tabs.

> +};
> +
> +static struct regmap_config sun8i_mixer_regmap_config = {
> +	.reg_bits	= 32,
> +	.val_bits	= 32,
> +	.reg_stride	= 4,
> +	.max_register	= 0xbfffc, /* guessed */
> +};
> +
> +static int sun8i_mixer_bind(struct device *dev, struct device *master,
> +			      void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct drm_device *drm = data;
> +	struct sun4i_drv *drv = drm->dev_private;
> +	struct sun8i_mixer *mixer;
> +	struct resource *res;
> +	void __iomem *regs;
> +	int i, ret;
> +
> +	mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
> +	if (!mixer)
> +		return -ENOMEM;
> +	dev_set_drvdata(dev, mixer);
> +	drv->engine = mixer;
> +	drv->engine_ops = &sun8i_engine_ops;
> +
> +	mixer->cfg = of_device_get_match_data(dev);
> +	if (!mixer->cfg)
> +		return -EINVAL;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
> +
> +	mixer->regs = devm_regmap_init_mmio(dev, regs,
> +					      &sun8i_mixer_regmap_config);
> +	if (IS_ERR(mixer->regs)) {
> +		dev_err(dev, "Couldn't create the mixer regmap\n");
> +		return PTR_ERR(mixer->regs);
> +	}
> +
> +	mixer->reset = devm_reset_control_get(dev, NULL);
> +	if (IS_ERR(mixer->reset)) {
> +		dev_err(dev, "Couldn't get our reset line\n");
> +		return PTR_ERR(mixer->reset);
> +	}
> +
> +	ret = reset_control_deassert(mixer->reset);
> +	if (ret) {
> +		dev_err(dev, "Couldn't deassert our reset line\n");
> +		return ret;
> +	}
> +
> +	mixer->bus_clk = devm_clk_get(dev, "bus");
> +	if (IS_ERR(mixer->bus_clk)) {
> +		dev_err(dev, "Couldn't get the mixer bus clock\n");
> +		ret = PTR_ERR(mixer->bus_clk);
> +		goto err_assert_reset;
> +	}
> +	clk_prepare_enable(mixer->bus_clk);
> +
> +	mixer->mod_clk = devm_clk_get(dev, "mod");
> +	if (IS_ERR(mixer->mod_clk)) {
> +		dev_err(dev, "Couldn't get the mixer module clock\n");
> +		ret = PTR_ERR(mixer->mod_clk);
> +		goto err_disable_bus_clk;
> +	}
> +	clk_prepare_enable(mixer->mod_clk);
> +
> +	/* Reset the registers */
> +	for (i = 0x0; i < 0x20000; i += 4)
> +		regmap_write(mixer->regs, i, 0);
> +
> +	/* Enable the mixer */
> +	regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_CTL,
> +		     SUN8I_MIXER_GLOBAL_CTL_RT_EN);
> +
> +	/* Initialize blender */
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_FCOLOR_CTL,
> +		     SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_PREMULTIPLY,
> +		     SUN8I_MIXER_BLEND_PREMULTIPLY_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_BKCOLOR,
> +		     SUN8I_MIXER_BLEND_BKCOLOR_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_MODE(0),
> +		     SUN8I_MIXER_BLEND_MODE_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_CK_CTL,
> +		     SUN8I_MIXER_BLEND_CK_CTL_DEF);
> +
> +	regmap_write(mixer->regs,
> +		     SUN8I_MIXER_BLEND_ATTR_FCOLOR(0),
> +		     SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF);
> +
> +	/* Select the first UI channel */
> +	DRM_DEBUG_DRIVER("Selecting channel %d (first UI channel)\n",
> +			 mixer->cfg->vi_num);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_ROUTE,
> +		     mixer->cfg->vi_num);
> +
> +	return 0;
> +
> +	clk_disable_unprepare(mixer->mod_clk);
> +err_disable_bus_clk:
> +	clk_disable_unprepare(mixer->bus_clk);
> +err_assert_reset:
> +	reset_control_assert(mixer->reset);
> +	return ret;
> +}
> +
> +static void sun8i_mixer_unbind(struct device *dev, struct device *master,
> +				 void *data)
> +{
> +	struct sun8i_mixer *mixer = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(mixer->mod_clk);
> +	clk_disable_unprepare(mixer->bus_clk);
> +	reset_control_assert(mixer->reset);
> +}
> +
> +static const struct component_ops sun8i_mixer_ops = {
> +	.bind	= sun8i_mixer_bind,
> +	.unbind	= sun8i_mixer_unbind,
> +};
> +
> +static int sun8i_mixer_probe(struct platform_device *pdev)
> +{
> +	return component_add(&pdev->dev, &sun8i_mixer_ops);
> +}
> +
> +static int sun8i_mixer_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &sun8i_mixer_ops);
> +
> +	return 0;
> +}
> +
> +static const struct sun8i_mixer_cfg sun8i_v3s_mixer_cfg = {
> +	.vi_num = 2,
> +	.ui_num = 1,
> +};
> +
> +static const struct of_device_id sun8i_mixer_of_table[] = {
> +	{
> +		.compatible = "allwinner,sun8i-v3s-de2-mixer",
> +		.data = &sun8i_v3s_mixer_cfg,
> +	},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sun8i_mixer_of_table);
> +
> +static struct platform_driver sun8i_mixer_platform_driver = {
> +	.probe		= sun8i_mixer_probe,
> +	.remove		= sun8i_mixer_remove,
> +	.driver		= {
> +		.name		= "sun8i-mixer",
> +		.of_match_table	= sun8i_mixer_of_table,
> +	},
> +};
> +module_platform_driver(sun8i_mixer_platform_driver);
> +
> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
> +MODULE_DESCRIPTION("Allwinner DE2 Mixer driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> new file mode 100644
> index 000000000000..a4a365ae44c9
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> @@ -0,0 +1,131 @@
> +/*
> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
> + *
> + * 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.
> + */
> +
> +#ifndef _SUN8I_MIXER_H_
> +#define _SUN8I_MIXER_H_
> +
> +#include <linux/clk.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include "sun4i_layer.h"
> +
> +#define SUN8I_MIXER_MAX_CHAN_COUNT		4
> +
> +#define SUN8I_MIXER_SIZE(w, h)			(((h) - 1) << 16 | ((w) - 1))
> +#define SUN8I_MIXER_COORD(x, y)			((y) << 16 | (x))
> +
> +#define SUN8I_MIXER_GLOBAL_CTL			0x0
> +#define SUN8I_MIXER_GLOBAL_STATUS		0x4
> +#define SUN8I_MIXER_GLOBAL_DBUFF		0x8
> +#define SUN8I_MIXER_GLOBAL_SIZE			0xc
> +
> +#define SUN8I_MIXER_GLOBAL_CTL_RT_EN		0x1
> +
> +#define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE		0x1
> +
> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL		0x1000
> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)	(0x1004 + 0x10 * (x) + 0x0)
> +#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)	(0x1004 + 0x10 * (x) + 0x4)
> +#define SUN8I_MIXER_BLEND_ATTR_OFFSET(x)	(0x1004 + 0x10 * (x) + 0x8)
> +#define SUN8I_MIXER_BLEND_ROUTE			0x1080
> +#define SUN8I_MIXER_BLEND_PREMULTIPLY		0x1084
> +#define SUN8I_MIXER_BLEND_BKCOLOR		0x1088
> +#define SUN8I_MIXER_BLEND_OUTSIZE		0x108c
> +#define SUN8I_MIXER_BLEND_MODE(x)		(0x1090 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_CTL		0x10b0
> +#define SUN8I_MIXER_BLEND_CK_CFG		0x10b4
> +#define SUN8I_MIXER_BLEND_CK_MAX(x)		(0x10c0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_MIN(x)		(0x10e0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_OUTCTL		0x10fc
> +
> +/* The following numbers are some still unknown magic numbers */
> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF	0xff000000
> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF	0x00000101
> +#define SUN8I_MIXER_BLEND_PREMULTIPLY_DEF	0x0
> +#define SUN8I_MIXER_BLEND_BKCOLOR_DEF		0xff000000
> +#define SUN8I_MIXER_BLEND_MODE_DEF		0x03010301
> +#define SUN8I_MIXER_BLEND_CK_CTL_DEF		0x0
> +
> +#define SUN8I_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
> +
> +/*
> + * VI channels are not used now, but the support of them may be introduced in
> + * the future.
> + */
> +
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x0)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_SIZE(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x4)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_COORD(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_PITCH(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0xc)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x10)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_BOT_LADDR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x14)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_FCOLOR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x18)
> +#define SUN8I_MIXER_CHAN_UI_TOP_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x80)
> +#define SUN8I_MIXER_CHAN_UI_BOT_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x84)
> +#define SUN8I_MIXER_CHAN_UI_OVL_SIZE(ch)	(0x2000 + 0x1000 * (ch) + 0x88)
> +
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN		BIT(0)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK	GENMASK(11, 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF	(1 << 1)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888	(0 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888	(4 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888	(8 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF	(0xff << 24)
> +
> +/*
> + * These sub-engines are still unknown now, the EN registers are here only to
> + * be used to disable these sub-engines.
> + */
> +#define SUN8I_MIXER_VSU_EN			0x20000
> +#define SUN8I_MIXER_GSU1_EN			0x30000
> +#define SUN8I_MIXER_GSU2_EN			0x40000
> +#define SUN8I_MIXER_GSU3_EN			0x50000
> +#define SUN8I_MIXER_FCE_EN			0xa0000
> +#define SUN8I_MIXER_BWS_EN			0xa2000
> +#define SUN8I_MIXER_LTI_EN			0xa4000
> +#define SUN8I_MIXER_PEAK_EN			0xa6000
> +#define SUN8I_MIXER_ASE_EN			0xa8000
> +#define SUN8I_MIXER_FCC_EN			0xaa000
> +#define SUN8I_MIXER_DCSC_EN			0xb0000
> +
> +struct sun8i_mixer_cfg {
> +	int		vi_num;
> +	int		ui_num;
> +};
> +
> +struct sun8i_mixer {
> +	struct regmap			*regs;
> +
> +	const struct sun8i_mixer_cfg	*cfg;
> +
> +	struct reset_control		*reset;
> +
> +	struct clk			*bus_clk;
> +	struct clk			*mod_clk;
> +};
> +
> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> +				int layer, bool enable);
> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
> +				     int layer, struct drm_plane *plane);
> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
> +				       int layer, struct drm_plane *plane);
> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
> +				      int layer, struct drm_plane *plane);
> +#endif /* _SUN8I_MIXER_H_ */

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v4 06/11] drm/sun4i: add support for Allwinner DE2 mixers

[Icenowy Zheng]

于 2017年4月18日 GMT+08:00 下午5:00:47, Maxime Ripard <maxime.ripard@free-electrons.com> 写到:
>On Sun, Apr 16, 2017 at 08:08:44PM +0800, Icenowy Zheng wrote:
>> Allwinner have a new "Display Engine 2.0" in their new SoCs, which
>comes
>> with mixers to do graphic processing and feed data to TCON, like the
>old
>> backends and frontends.
>> 
>> Add support for the mixer on Allwinner V3s SoC; it's the simplest
>one.
>> 
>> Currently a lot of functions are still missing -- more investigations
>> are needed to gain enough information for them.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
>> ---
>> Changes in v4:
>> - Killed some dead code according to Jernej.
>> 
>>  drivers/gpu/drm/sun4i/Kconfig       |  10 +
>>  drivers/gpu/drm/sun4i/Makefile      |   4 +
>>  drivers/gpu/drm/sun4i/sun8i_layer.c | 142 ++++++++++++++
>>  drivers/gpu/drm/sun4i/sun8i_layer.h |  36 ++++
>>  drivers/gpu/drm/sun4i/sun8i_mixer.c | 381
>++++++++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/sun4i/sun8i_mixer.h | 131 +++++++++++++
>>  6 files changed, 704 insertions(+)
>>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.c
>>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_layer.h
>>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.c
>>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.h
>> 
>> diff --git a/drivers/gpu/drm/sun4i/Kconfig
>b/drivers/gpu/drm/sun4i/Kconfig
>> index 5a8227f37cc4..15557484520d 100644
>> --- a/drivers/gpu/drm/sun4i/Kconfig
>> +++ b/drivers/gpu/drm/sun4i/Kconfig
>> @@ -22,3 +22,13 @@ config DRM_SUN4I_BACKEND
>>  	  original Allwinner Display Engine, which has a backend to
>>  	  do some alpha blending and feed graphics to TCON. If M is
>>  	  selected the module will be called sun4i-backend.
>> +
>> +config DRM_SUN4I_SUN8I_MIXER
>> +	tristate "Support for Allwinner Display Engine 2.0 Mixer"
>> +	depends on DRM_SUN4I
>> +	default MACH_SUN8I
>> +	help
>> +	  Choose this option if you have an Allwinner SoC with the
>> +	  Allwinner Display Engine 2.0, which has a mixer to do some
>> +	  graphics mixture and feed graphics to TCON, If M is
>> +	  selected the module will be called sun8i-mixer.
>> diff --git a/drivers/gpu/drm/sun4i/Makefile
>b/drivers/gpu/drm/sun4i/Makefile
>> index 1db1068b9be1..7625c2dad1bb 100644
>> --- a/drivers/gpu/drm/sun4i/Makefile
>> +++ b/drivers/gpu/drm/sun4i/Makefile
>> @@ -9,7 +9,11 @@ sun4i-tcon-y += sun4i_crtc.o
>>  sun4i-backend-y += sun4i_layer.o
>>  sun4i-backend-y += sun4i_backend.o
>>  
>> +sun8i-mixer-y += sun8i_layer.o
>> +sun8i-mixer-y += sun8i_mixer.o
>> +
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
>>  obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
>> +obj-$(CONFIG_DRM_SUN4I_SUN8I_MIXER) += sun8i-mixer.o
>
>Please align the value using tabs.

Should I re-align existed items?

>
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
>> diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.c
>b/drivers/gpu/drm/sun4i/sun8i_layer.c
>> new file mode 100644
>> index 000000000000..d70a90d963b0
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sun8i_layer.c
>> @@ -0,0 +1,142 @@
>> +/*
>> + * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
>> + *
>> + * Based on sun4i_layer.h, which is:
>> + *   Copyright (C) 2015 Free Electrons
>> + *   Copyright (C) 2015 NextThing Co
>> + *
>> + *   Maxime Ripard <maxime.ripard@free-electrons.com>
>> + *
>> + * 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/drm_atomic_helper.h>
>> +#include <drm/drm_crtc.h>
>> +#include <drm/drm_plane_helper.h>
>> +#include <drm/drmP.h>
>> +
>> +#include "sun4i_crtc.h"
>> +#include "sun8i_layer.h"
>> +#include "sun8i_mixer.h"
>> +
>> +struct sun8i_plane_desc {
>> +	       enum drm_plane_type     type;
>> +	       const uint32_t          *formats;
>> +	       uint32_t                nformats;
>> +};
>> +
>> +static int sun8i_mixer_layer_atomic_check(struct drm_plane *plane,
>> +					    struct drm_plane_state *state)
>> +{
>> +	return 0;
>> +}
>> +
>> +static void sun8i_mixer_layer_atomic_disable(struct drm_plane
>*plane,
>> +					       struct drm_plane_state *old_state)
>> +{
>> +	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
>> +	struct sun8i_mixer *mixer = layer->mixer;
>> +
>> +	sun8i_mixer_layer_enable(mixer, layer->id, false);
>> +}
>> +
>> +static void sun8i_mixer_layer_atomic_update(struct drm_plane *plane,
>> +					      struct drm_plane_state *old_state)
>> +{
>> +	struct sun8i_layer *layer = plane_to_sun8i_layer(plane);
>> +	struct sun8i_mixer *mixer = layer->mixer;
>> +
>> +	sun8i_mixer_update_layer_coord(mixer, layer->id, plane);
>> +	sun8i_mixer_update_layer_formats(mixer, layer->id, plane);
>> +	sun8i_mixer_update_layer_buffer(mixer, layer->id, plane);
>> +	sun8i_mixer_layer_enable(mixer, layer->id, true);
>> +}
>> +
>> +static struct drm_plane_helper_funcs sun8i_mixer_layer_helper_funcs
>= {
>> +	.atomic_check	= sun8i_mixer_layer_atomic_check,
>> +	.atomic_disable	= sun8i_mixer_layer_atomic_disable,
>> +	.atomic_update	= sun8i_mixer_layer_atomic_update,
>> +};
>> +
>> +static const struct drm_plane_funcs sun8i_mixer_layer_funcs = {
>> +	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
>> +	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
>> +	.destroy		= drm_plane_cleanup,
>> +	.disable_plane		= drm_atomic_helper_disable_plane,
>> +	.reset			= drm_atomic_helper_plane_reset,
>> +	.update_plane		= drm_atomic_helper_update_plane,
>> +};
>> +
>> +static const uint32_t sun8i_mixer_layer_formats[] = {
>> +	DRM_FORMAT_RGB888,
>> +	DRM_FORMAT_XRGB8888,
>> +};
>> +
>> +static const struct sun8i_plane_desc sun8i_mixer_planes[] = {
>> +	{
>> +		.type = DRM_PLANE_TYPE_PRIMARY,
>> +		.formats = sun8i_mixer_layer_formats,
>> +		.nformats = ARRAY_SIZE(sun8i_mixer_layer_formats),
>> +	},
>> +};
>> +
>> +static struct sun8i_layer *sun8i_layer_init_one(struct drm_device
>*drm,
>> +						struct sun8i_mixer *mixer,
>> +						const struct sun8i_plane_desc *plane)
>> +{
>> +	struct sun8i_layer *layer;
>> +	int ret;
>> +
>> +	layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
>> +	if (!layer)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	/* possible crtcs are set later */
>> +	ret = drm_universal_plane_init(drm, &layer->plane, 0,
>> +				       &sun8i_mixer_layer_funcs,
>> +				       plane->formats, plane->nformats,
>> +				       plane->type, NULL);
>> +	if (ret) {
>> +		dev_err(drm->dev, "Couldn't initialize layer\n");
>> +		return ERR_PTR(ret);
>> +	}
>> +
>> +	drm_plane_helper_add(&layer->plane,
>> +			     &sun8i_mixer_layer_helper_funcs);
>> +	layer->mixer = mixer;
>> +
>> +	return layer;
>> +}
>> +
>> +struct drm_plane **sun8i_layers_init(struct drm_device *drm,
>> +				     struct sun4i_crtc *crtc)
>> +{
>> +	struct drm_plane **planes;
>> +	struct sun8i_mixer *mixer = crtc->engine;
>> +	int i;
>> +
>> +	planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun8i_mixer_planes) + 1,
>> +			      sizeof(*planes), GFP_KERNEL);
>> +	if (!planes)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(sun8i_mixer_planes); i++) {
>> +		const struct sun8i_plane_desc *plane = &sun8i_mixer_planes[i];
>> +		struct sun8i_layer *layer;
>> +
>> +		layer = sun8i_layer_init_one(drm, mixer, plane);
>> +		if (IS_ERR(layer)) {
>> +			dev_err(drm->dev, "Couldn't initialize %s plane\n",
>> +				i ? "overlay" : "primary");
>> +			return ERR_CAST(layer);
>> +		};
>> +
>> +		layer->id = i;
>> +		planes[i] = &layer->plane;
>> +	};
>> +
>> +	return planes;
>> +}
>> diff --git a/drivers/gpu/drm/sun4i/sun8i_layer.h
>b/drivers/gpu/drm/sun4i/sun8i_layer.h
>> new file mode 100644
>> index 000000000000..fe7e8a069d71
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sun8i_layer.h
>> @@ -0,0 +1,36 @@
>> +/*
>> + * Copyright (C) Icenowy Zheng <icenowy@aosc.io>
>> + *
>> + * Based on sun4i_layer.h, which is:
>> + *   Copyright (C) 2015 Free Electrons
>> + *   Copyright (C) 2015 NextThing Co
>> + *
>> + *   Maxime Ripard <maxime.ripard@free-electrons.com>
>> + *
>> + * 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.
>> + */
>> +
>> +#ifndef _SUN8I_LAYER_H_
>> +#define _SUN8I_LAYER_H_
>> +
>> +struct sun4i_crtc;
>> +
>> +struct sun8i_layer {
>> +	struct drm_plane	plane;
>> +	struct sun4i_drv	*drv;
>> +	struct sun8i_mixer	*mixer;
>> +	int			id;
>> +};
>> +
>> +static inline struct sun8i_layer *
>> +plane_to_sun8i_layer(struct drm_plane *plane)
>> +{
>> +	return container_of(plane, struct sun8i_layer, plane);
>> +}
>> +
>> +struct drm_plane **sun8i_layers_init(struct drm_device *drm,
>> +				     struct sun4i_crtc *crtc);
>> +#endif /* _SUN8I_LAYER_H_ */
>> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c
>b/drivers/gpu/drm/sun4i/sun8i_mixer.c
>> new file mode 100644
>> index 000000000000..5cff3f3833a7
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
>> @@ -0,0 +1,381 @@
>> +/*
>> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
>> + *
>> + * 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 "sun4i_drv.h"
>> +#include "sun8i_mixer.h"
>> +#include "sun8i_layer.h"
>> +#include "sunxi_engine.h"
>> +
>> +void sun8i_mixer_commit(void *mixer)
>> +{
>> +	struct sun8i_mixer *sun8i_mixer = mixer;
>> +
>> +	DRM_DEBUG_DRIVER("Committing changes\n");
>> +
>> +	regmap_write(sun8i_mixer->regs, SUN8I_MIXER_GLOBAL_DBUFF,
>> +		     SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
>> +}
>> +
>> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
>> +				int layer, bool enable)
>> +{
>> +	u32 val;
>> +	/* Currently the first UI channel is used */
>> +	int chan = mixer->cfg->vi_num;
>> +
>> +	DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
>> +
>> +	if (enable)
>> +		val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
>> +	else
>> +		val = 0;
>> +
>> +	regmap_update_bits(mixer->regs,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
>> +
>> +	/* Set the alpha configuration */
>> +	regmap_update_bits(mixer->regs,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF);
>> +	regmap_update_bits(mixer->regs,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF);
>> +}
>> +EXPORT_SYMBOL(sun8i_mixer_layer_enable);
>
>Why do you need to export it?

Oh... not needed. This export is dead code.

>
>> +
>> +static int sun8i_mixer_drm_format_to_layer(struct drm_plane *plane,
>> +					     u32 format, u32 *mode)
>> +{
>> +	switch (format) {
>> +	case DRM_FORMAT_XRGB8888:
>> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888;
>> +		break;
>> +
>> +	case DRM_FORMAT_RGB888:
>> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888;
>> +		break;
>> +
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
>> +				     int layer, struct drm_plane *plane)
>> +{
>> +	struct drm_plane_state *state = plane->state;
>> +	struct drm_framebuffer *fb = state->fb;
>> +	/* Currently the first UI channel is used */
>> +	int chan = mixer->cfg->vi_num;
>> +
>> +	DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
>> +
>> +	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
>> +		DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H:
>%u\n",
>> +				 state->crtc_w, state->crtc_h);
>> +		regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_SIZE,
>> +			     SUN8I_MIXER_SIZE(state->crtc_w,
>> +					      state->crtc_h));
>> +		DRM_DEBUG_DRIVER("Updating blender size\n");
>> +		regmap_write(mixer->regs,
>> +			     SUN8I_MIXER_BLEND_ATTR_INSIZE(0),
>> +			     SUN8I_MIXER_SIZE(state->crtc_w,
>> +					      state->crtc_h));
>> +		regmap_write(mixer->regs, SUN8I_MIXER_BLEND_OUTSIZE,
>> +			     SUN8I_MIXER_SIZE(state->crtc_w,
>> +					      state->crtc_h));
>> +		DRM_DEBUG_DRIVER("Updating channel size\n");
>> +		regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_OVL_SIZE(chan),
>> +			     SUN8I_MIXER_SIZE(state->crtc_w,
>> +					      state->crtc_h));
>> +	}
>> +
>> +	/* Set the line width */
>> +	DRM_DEBUG_DRIVER("Layer line width: %d bytes\n", fb->pitches[0]);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_PITCH(chan,
>layer),
>> +		     fb->pitches[0]);
>> +
>> +	/* Set height and width */
>> +	DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
>> +			 state->crtc_w, state->crtc_h);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_SIZE(chan,
>layer),
>> +		     SUN8I_MIXER_SIZE(state->crtc_w, state->crtc_h));
>> +
>> +	/* Set base coordinates */
>> +	DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
>> +			 state->crtc_x, state->crtc_y);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_COORD(chan,
>layer),
>> +		     SUN8I_MIXER_COORD(state->crtc_x, state->crtc_y));
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(sun8i_mixer_update_layer_coord);
>> +
>> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
>> +				       int layer, struct drm_plane *plane)
>> +{
>> +	struct drm_plane_state *state = plane->state;
>> +	struct drm_framebuffer *fb = state->fb;
>> +	bool interlaced = false;
>> +	u32 val;
>> +	/* Currently the first UI channel is used */
>> +	int chan = mixer->cfg->vi_num;
>> +	int ret;
>> +
>> +	if (plane->state->crtc)
>> +		interlaced = plane->state->crtc->state->adjusted_mode.flags
>> +			& DRM_MODE_FLAG_INTERLACE;
>> +
>> +	regmap_update_bits(mixer->regs, SUN8I_MIXER_BLEND_OUTCTL,
>> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
>> +			   interlaced ?
>> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED : 0);
>> +
>> +	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
>> +			 interlaced ? "on" : "off");
>
>You're not using interlaced anywhere.

ok.

>
>> +
>> +	ret = sun8i_mixer_drm_format_to_layer(plane, fb->format->format,
>> +						&val);
>> +	if (ret) {
>> +		DRM_DEBUG_DRIVER("Invalid format\n");
>> +		return ret;
>> +	}
>> +
>> +	regmap_update_bits(mixer->regs,
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
>> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK, val);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(sun8i_mixer_update_layer_formats);
>> +
>> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
>> +				      int layer, struct drm_plane *plane)
>> +{
>> +	struct drm_plane_state *state = plane->state;
>> +	struct drm_framebuffer *fb = state->fb;
>> +	struct drm_gem_cma_object *gem;
>> +	dma_addr_t paddr;
>> +	uint32_t paddr_u32;
>> +	/* Currently the first UI channel is used */
>> +	int chan = mixer->cfg->vi_num;
>> +	int bpp;
>> +
>> +	/* Get the physical address of the buffer in memory */
>> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
>> +
>> +	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
>> +
>> +	/* Compute the start of the displayed memory */
>> +	bpp = fb->format->cpp[0];
>> +	paddr = gem->paddr + fb->offsets[0];
>> +	paddr += (state->src_x >> 16) * bpp;
>> +	paddr += (state->src_y >> 16) * fb->pitches[0];
>> +
>> +	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
>> +
>> +	paddr_u32 = (uint32_t) paddr;
>
>How does that work on 64-bits systems ?

The hardware is not designed to work on 64-bit systems.

Even 64-bit A64/H5 has also 3GiB memory limit.

The address cell in mixer hardware is also only 32-bit.

So we should just keep the force conversion here. If we then really met 4GiB-capable AW SoC without changing DE2, I think we should have other way to limit CMA pool inside 4GiB.

>
>> +
>> +	regmap_write(mixer->regs,
>> +		     SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(chan, layer),
>> +		     paddr_u32);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(sun8i_mixer_update_layer_buffer);
>> +
>> +static const struct sunxi_engine_ops sun8i_engine_ops = {
>> +	.commit = sun8i_mixer_commit,
>> +	.layers_init = sun8i_layers_init,
>
>Align with tabs.
>
>> +};
>> +
>> +static struct regmap_config sun8i_mixer_regmap_config = {
>> +	.reg_bits	= 32,
>> +	.val_bits	= 32,
>> +	.reg_stride	= 4,
>> +	.max_register	= 0xbfffc, /* guessed */
>> +};
>> +
>> +static int sun8i_mixer_bind(struct device *dev, struct device
>*master,
>> +			      void *data)
>> +{
>> +	struct platform_device *pdev = to_platform_device(dev);
>> +	struct drm_device *drm = data;
>> +	struct sun4i_drv *drv = drm->dev_private;
>> +	struct sun8i_mixer *mixer;
>> +	struct resource *res;
>> +	void __iomem *regs;
>> +	int i, ret;
>> +
>> +	mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
>> +	if (!mixer)
>> +		return -ENOMEM;
>> +	dev_set_drvdata(dev, mixer);
>> +	drv->engine = mixer;
>> +	drv->engine_ops = &sun8i_engine_ops;
>> +
>> +	mixer->cfg = of_device_get_match_data(dev);
>> +	if (!mixer->cfg)
>> +		return -EINVAL;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	regs = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(regs))
>> +		return PTR_ERR(regs);
>> +
>> +	mixer->regs = devm_regmap_init_mmio(dev, regs,
>> +					      &sun8i_mixer_regmap_config);
>> +	if (IS_ERR(mixer->regs)) {
>> +		dev_err(dev, "Couldn't create the mixer regmap\n");
>> +		return PTR_ERR(mixer->regs);
>> +	}
>> +
>> +	mixer->reset = devm_reset_control_get(dev, NULL);
>> +	if (IS_ERR(mixer->reset)) {
>> +		dev_err(dev, "Couldn't get our reset line\n");
>> +		return PTR_ERR(mixer->reset);
>> +	}
>> +
>> +	ret = reset_control_deassert(mixer->reset);
>> +	if (ret) {
>> +		dev_err(dev, "Couldn't deassert our reset line\n");
>> +		return ret;
>> +	}
>> +
>> +	mixer->bus_clk = devm_clk_get(dev, "bus");
>> +	if (IS_ERR(mixer->bus_clk)) {
>> +		dev_err(dev, "Couldn't get the mixer bus clock\n");
>> +		ret = PTR_ERR(mixer->bus_clk);
>> +		goto err_assert_reset;
>> +	}
>> +	clk_prepare_enable(mixer->bus_clk);
>> +
>> +	mixer->mod_clk = devm_clk_get(dev, "mod");
>> +	if (IS_ERR(mixer->mod_clk)) {
>> +		dev_err(dev, "Couldn't get the mixer module clock\n");
>> +		ret = PTR_ERR(mixer->mod_clk);
>> +		goto err_disable_bus_clk;
>> +	}
>> +	clk_prepare_enable(mixer->mod_clk);
>> +
>> +	/* Reset the registers */
>> +	for (i = 0x0; i < 0x20000; i += 4)
>> +		regmap_write(mixer->regs, i, 0);
>> +
>> +	/* Enable the mixer */
>> +	regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_CTL,
>> +		     SUN8I_MIXER_GLOBAL_CTL_RT_EN);
>> +
>> +	/* Initialize blender */
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_FCOLOR_CTL,
>> +		     SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_PREMULTIPLY,
>> +		     SUN8I_MIXER_BLEND_PREMULTIPLY_DEF);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_BKCOLOR,
>> +		     SUN8I_MIXER_BLEND_BKCOLOR_DEF);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_MODE(0),
>> +		     SUN8I_MIXER_BLEND_MODE_DEF);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_CK_CTL,
>> +		     SUN8I_MIXER_BLEND_CK_CTL_DEF);
>> +
>> +	regmap_write(mixer->regs,
>> +		     SUN8I_MIXER_BLEND_ATTR_FCOLOR(0),
>> +		     SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF);
>> +
>> +	/* Select the first UI channel */
>> +	DRM_DEBUG_DRIVER("Selecting channel %d (first UI channel)\n",
>> +			 mixer->cfg->vi_num);
>> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_ROUTE,
>> +		     mixer->cfg->vi_num);
>> +
>> +	return 0;
>> +
>> +	clk_disable_unprepare(mixer->mod_clk);
>> +err_disable_bus_clk:
>> +	clk_disable_unprepare(mixer->bus_clk);
>> +err_assert_reset:
>> +	reset_control_assert(mixer->reset);
>> +	return ret;
>> +}
>> +
>> +static void sun8i_mixer_unbind(struct device *dev, struct device
>*master,
>> +				 void *data)
>> +{
>> +	struct sun8i_mixer *mixer = dev_get_drvdata(dev);
>> +
>> +	clk_disable_unprepare(mixer->mod_clk);
>> +	clk_disable_unprepare(mixer->bus_clk);
>> +	reset_control_assert(mixer->reset);
>> +}
>> +
>> +static const struct component_ops sun8i_mixer_ops = {
>> +	.bind	= sun8i_mixer_bind,
>> +	.unbind	= sun8i_mixer_unbind,
>> +};
>> +
>> +static int sun8i_mixer_probe(struct platform_device *pdev)
>> +{
>> +	return component_add(&pdev->dev, &sun8i_mixer_ops);
>> +}
>> +
>> +static int sun8i_mixer_remove(struct platform_device *pdev)
>> +{
>> +	component_del(&pdev->dev, &sun8i_mixer_ops);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct sun8i_mixer_cfg sun8i_v3s_mixer_cfg = {
>> +	.vi_num = 2,
>> +	.ui_num = 1,
>> +};
>> +
>> +static const struct of_device_id sun8i_mixer_of_table[] = {
>> +	{
>> +		.compatible = "allwinner,sun8i-v3s-de2-mixer",
>> +		.data = &sun8i_v3s_mixer_cfg,
>> +	},
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, sun8i_mixer_of_table);
>> +
>> +static struct platform_driver sun8i_mixer_platform_driver = {
>> +	.probe		= sun8i_mixer_probe,
>> +	.remove		= sun8i_mixer_remove,
>> +	.driver		= {
>> +		.name		= "sun8i-mixer",
>> +		.of_match_table	= sun8i_mixer_of_table,
>> +	},
>> +};
>> +module_platform_driver(sun8i_mixer_platform_driver);
>> +
>> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
>> +MODULE_DESCRIPTION("Allwinner DE2 Mixer driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h
>b/drivers/gpu/drm/sun4i/sun8i_mixer.h
>> new file mode 100644
>> index 000000000000..a4a365ae44c9
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
>> @@ -0,0 +1,131 @@
>> +/*
>> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
>> + *
>> + * 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.
>> + */
>> +
>> +#ifndef _SUN8I_MIXER_H_
>> +#define _SUN8I_MIXER_H_
>> +
>> +#include <linux/clk.h>
>> +#include <linux/regmap.h>
>> +#include <linux/reset.h>
>> +
>> +#include "sun4i_layer.h"
>> +
>> +#define SUN8I_MIXER_MAX_CHAN_COUNT		4
>> +
>> +#define SUN8I_MIXER_SIZE(w, h)			(((h) - 1) << 16 | ((w) - 1))
>> +#define SUN8I_MIXER_COORD(x, y)			((y) << 16 | (x))
>> +
>> +#define SUN8I_MIXER_GLOBAL_CTL			0x0
>> +#define SUN8I_MIXER_GLOBAL_STATUS		0x4
>> +#define SUN8I_MIXER_GLOBAL_DBUFF		0x8
>> +#define SUN8I_MIXER_GLOBAL_SIZE			0xc
>> +
>> +#define SUN8I_MIXER_GLOBAL_CTL_RT_EN		0x1
>> +
>> +#define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE		0x1
>> +
>> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL		0x1000
>> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)	(0x1004 + 0x10 * (x) + 0x0)
>> +#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)	(0x1004 + 0x10 * (x) + 0x4)
>> +#define SUN8I_MIXER_BLEND_ATTR_OFFSET(x)	(0x1004 + 0x10 * (x) + 0x8)
>> +#define SUN8I_MIXER_BLEND_ROUTE			0x1080
>> +#define SUN8I_MIXER_BLEND_PREMULTIPLY		0x1084
>> +#define SUN8I_MIXER_BLEND_BKCOLOR		0x1088
>> +#define SUN8I_MIXER_BLEND_OUTSIZE		0x108c
>> +#define SUN8I_MIXER_BLEND_MODE(x)		(0x1090 + 0x04 * (x))
>> +#define SUN8I_MIXER_BLEND_CK_CTL		0x10b0
>> +#define SUN8I_MIXER_BLEND_CK_CFG		0x10b4
>> +#define SUN8I_MIXER_BLEND_CK_MAX(x)		(0x10c0 + 0x04 * (x))
>> +#define SUN8I_MIXER_BLEND_CK_MIN(x)		(0x10e0 + 0x04 * (x))
>> +#define SUN8I_MIXER_BLEND_OUTCTL		0x10fc
>> +
>> +/* The following numbers are some still unknown magic numbers */
>> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF	0xff000000
>> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF	0x00000101
>> +#define SUN8I_MIXER_BLEND_PREMULTIPLY_DEF	0x0
>> +#define SUN8I_MIXER_BLEND_BKCOLOR_DEF		0xff000000
>> +#define SUN8I_MIXER_BLEND_MODE_DEF		0x03010301
>> +#define SUN8I_MIXER_BLEND_CK_CTL_DEF		0x0
>> +
>> +#define SUN8I_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
>> +
>> +/*
>> + * VI channels are not used now, but the support of them may be
>introduced in
>> + * the future.
>> + */
>> +
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x0)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_SIZE(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x4)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_COORD(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x8)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_PITCH(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0xc)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x10)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_BOT_LADDR(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x14)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_FCOLOR(ch, layer) \
>> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x18)
>> +#define SUN8I_MIXER_CHAN_UI_TOP_HADDR(ch)	(0x2000 + 0x1000 * (ch) +
>0x80)
>> +#define SUN8I_MIXER_CHAN_UI_BOT_HADDR(ch)	(0x2000 + 0x1000 * (ch) +
>0x84)
>> +#define SUN8I_MIXER_CHAN_UI_OVL_SIZE(ch)	(0x2000 + 0x1000 * (ch) +
>0x88)
>> +
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN		BIT(0)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK	GENMASK(11, 8)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF	(1 << 1)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888	(0 << 8)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888	(4 << 8)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888	(8 << 8)
>> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF	(0xff << 24)
>> +
>> +/*
>> + * These sub-engines are still unknown now, the EN registers are
>here only to
>> + * be used to disable these sub-engines.
>> + */
>> +#define SUN8I_MIXER_VSU_EN			0x20000
>> +#define SUN8I_MIXER_GSU1_EN			0x30000
>> +#define SUN8I_MIXER_GSU2_EN			0x40000
>> +#define SUN8I_MIXER_GSU3_EN			0x50000
>> +#define SUN8I_MIXER_FCE_EN			0xa0000
>> +#define SUN8I_MIXER_BWS_EN			0xa2000
>> +#define SUN8I_MIXER_LTI_EN			0xa4000
>> +#define SUN8I_MIXER_PEAK_EN			0xa6000
>> +#define SUN8I_MIXER_ASE_EN			0xa8000
>> +#define SUN8I_MIXER_FCC_EN			0xaa000
>> +#define SUN8I_MIXER_DCSC_EN			0xb0000
>> +
>> +struct sun8i_mixer_cfg {
>> +	int		vi_num;
>> +	int		ui_num;
>> +};
>> +
>> +struct sun8i_mixer {
>> +	struct regmap			*regs;
>> +
>> +	const struct sun8i_mixer_cfg	*cfg;
>> +
>> +	struct reset_control		*reset;
>> +
>> +	struct clk			*bus_clk;
>> +	struct clk			*mod_clk;
>> +};
>> +
>> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
>> +				int layer, bool enable);
>> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
>> +				     int layer, struct drm_plane *plane);
>> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
>> +				       int layer, struct drm_plane *plane);
>> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
>> +				      int layer, struct drm_plane *plane);
>> +#endif /* _SUN8I_MIXER_H_ */
>
>Thanks,
>Maxime

Re: [PATCH v4 05/11] drm/sun4i: abstract a engine type

[Icenowy Zheng]

于 2017年4月18日 GMT+08:00 下午4:55:48, Maxime Ripard <maxime.ripard@free-electrons.com> 写到:
>Hi,
>
>Thanks for that rework.
>
>On Sun, Apr 16, 2017 at 08:08:43PM +0800, Icenowy Zheng wrote:
>> As we are going to add support for the Allwinner DE2 engine in
>sun4i-drm
>> driver, we will finally have two types of display engines -- the DE1
>> backend and the DE2 mixer. They both do some display blending and
>feed
>> graphics data to TCON, so I choose to call them both "engine" here.
>> 
>> Abstract the engine type to void * and a ops struct, which contains
>> functions that should be called outside the engine-specified code (in
>> TCON, CRTC or TV Encoder code).
>> 
>> A dedicated Kconfig option is also added to control whether
>> sun4i-backend-specified code (sun4i_backend.c and sun4i_layer.c)
>should
>> be built. As we removed the codes in CRTC code that directly call the
>> layer code, we can now extract the layer part and combine it with the
>> backend part into a new module, sun4i-backend.ko.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
>> ---
>> Changes in v4:
>> - Comments to tag the color correction functions as optional.
>> - Check before calling the optional functions.
>> - Change layers_init to satisfy new PATCH v4 04/11.
>> 
>>  drivers/gpu/drm/sun4i/Kconfig         | 10 ++++++++++
>>  drivers/gpu/drm/sun4i/Makefile        |  6 ++++--
>>  drivers/gpu/drm/sun4i/sun4i_backend.c | 26
>+++++++++++++++++++-------
>>  drivers/gpu/drm/sun4i/sun4i_backend.h |  5 -----
>>  drivers/gpu/drm/sun4i/sun4i_crtc.c    | 14 +++++++-------
>>  drivers/gpu/drm/sun4i/sun4i_crtc.h    |  7 ++++---
>>  drivers/gpu/drm/sun4i/sun4i_drv.h     |  3 ++-
>>  drivers/gpu/drm/sun4i/sun4i_layer.c   |  2 +-
>>  drivers/gpu/drm/sun4i/sun4i_layer.h   |  3 ++-
>>  drivers/gpu/drm/sun4i/sun4i_tcon.c    |  2 +-
>>  drivers/gpu/drm/sun4i/sun4i_tv.c      | 11 ++++++-----
>>  drivers/gpu/drm/sun4i/sunxi_engine.h  | 35
>+++++++++++++++++++++++++++++++++++
>>  12 files changed, 91 insertions(+), 33 deletions(-)
>>  create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h
>> 
>> diff --git a/drivers/gpu/drm/sun4i/Kconfig
>b/drivers/gpu/drm/sun4i/Kconfig
>> index a4b357db8856..5a8227f37cc4 100644
>> --- a/drivers/gpu/drm/sun4i/Kconfig
>> +++ b/drivers/gpu/drm/sun4i/Kconfig
>> @@ -12,3 +12,13 @@ config DRM_SUN4I
>>  	  Choose this option if you have an Allwinner SoC with a
>>  	  Display Engine. If M is selected the module will be called
>>  	  sun4i-drm.
>> +
>> +config DRM_SUN4I_BACKEND
>> +	tristate "Support for Allwinner A10 Display Engine Backend"
>> +	depends on DRM_SUN4I
>> +	default DRM_SUN4I
>> +	help
>> +	  Choose this option if you have an Allwinner SoC with the
>> +	  original Allwinner Display Engine, which has a backend to
>> +	  do some alpha blending and feed graphics to TCON. If M is
>> +	  selected the module will be called sun4i-backend.
>> diff --git a/drivers/gpu/drm/sun4i/Makefile
>b/drivers/gpu/drm/sun4i/Makefile
>> index 59b757350a1f..1db1068b9be1 100644
>> --- a/drivers/gpu/drm/sun4i/Makefile
>> +++ b/drivers/gpu/drm/sun4i/Makefile
>> @@ -5,9 +5,11 @@ sun4i-tcon-y += sun4i_tcon.o
>>  sun4i-tcon-y += sun4i_rgb.o
>>  sun4i-tcon-y += sun4i_dotclock.o
>>  sun4i-tcon-y += sun4i_crtc.o
>> -sun4i-tcon-y += sun4i_layer.o
>> +
>> +sun4i-backend-y += sun4i_layer.o
>> +sun4i-backend-y += sun4i_backend.o
>>  
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
>> -obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
>> +obj-$(CONFIG_DRM_SUN4I_BACKEND)	+= sun4i-backend.o
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
>>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
>> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c
>b/drivers/gpu/drm/sun4i/sun4i_backend.c
>> index d660741ba475..a16c96a002a4 100644
>> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
>> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
>> @@ -23,6 +23,8 @@
>>  
>>  #include "sun4i_backend.h"
>>  #include "sun4i_drv.h"
>> +#include "sun4i_layer.h"
>> +#include "sunxi_engine.h"
>>  
>>  static const u32 sunxi_rgb2yuv_coef[12] = {
>>  	0x00000107, 0x00000204, 0x00000064, 0x00000108,
>> @@ -30,9 +32,10 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
>>  	0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
>>  };
>>  
>> -void sun4i_backend_apply_color_correction(struct sun4i_backend
>*backend)
>> +static void sun4i_backend_apply_color_correction(void *engine)
>>  {
>>  	int i;
>> +	struct sun4i_backend *backend = engine;
>
>I'm not really fond of passing an opaque pointer here, and hope that
>things will work out.
>
>I think having a common structure, holding the common thingsand a more
>specific structure for that one would work better.
>
>Something like
>
>struct sunxi_engine {
>       struct regmap	*regs;
>};
>
>struct sun4i_backend {
>       struct sunxi_engine	engine;
>
>	struct clk		*sat_clk;
>	struct reset_control	*sat_reset;
>	
>};

Sounds good ;-)

>
>static void sun4i_backend_apply_color_correction(struct sunxi_engine
>*engine)
>struct sun4i_backend *backend = container_of(engine, struct
>sun4i_backend, engine);
>
>...
>
>> +static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
>> +	.commit = sun4i_backend_commit,
>> +	.layers_init = sun4i_layers_init,
>> +	.apply_color_correction = sun4i_backend_apply_color_correction,
>> +	.disable_color_correction = sun4i_backend_disable_color_correction,
>
>Please align the values with tabs, like done in the other structures
>created that way in this driver.
>
>>  static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
>> @@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc
>*crtc,
>>  
>>  	DRM_DEBUG_DRIVER("Committing plane changes\n");
>>  
>> -	sun4i_backend_commit(scrtc->backend);
>> +	scrtc->engine_ops->commit(scrtc->engine);
>
>You rely on the backend having setup things properly, which is pretty
>fragile. Ideally, you should have a function to check that engine_ops
>and commit is !NULL, and call it, and the consumers would use that
>function...

If it's really NULL how should the function return?

>
>> @@ -362,7 +361,9 @@ static void sun4i_tv_disable(struct drm_encoder
>*encoder)
>>  	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
>>  			   SUN4I_TVE_EN_ENABLE,
>>  			   0);
>> -	sun4i_backend_disable_color_correction(backend);
>> +
>> +	if (crtc->engine_ops->disable_color_correction)
>> +		crtc->engine_ops->disable_color_correction(crtc->engine);
>>  }
>
>... Instead of having to do it in some cases, but not always ...
>
>>  static void sun4i_tv_enable(struct drm_encoder *encoder)
>> @@ -370,11 +371,11 @@ static void sun4i_tv_enable(struct drm_encoder
>*encoder)
>>  	struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
>>  	struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc);
>>  	struct sun4i_tcon *tcon = crtc->tcon;
>> -	struct sun4i_backend *backend = crtc->backend;
>>  
>>  	DRM_DEBUG_DRIVER("Enabling the TV Output\n");
>>  
>> -	sun4i_backend_apply_color_correction(backend);
>> +	if (crtc->engine_ops->apply_color_correction)
>> +		crtc->engine_ops->apply_color_correction(crtc->engine);
>>  
>>  	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
>>  			   SUN4I_TVE_EN_ENABLE,
>> diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h
>b/drivers/gpu/drm/sun4i/sunxi_engine.h
>> new file mode 100644
>> index 000000000000..a9128abda66f
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
>> @@ -0,0 +1,35 @@
>> +/*
>> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
>> + *
>> + * 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.
>> + */
>> +
>> +#ifndef _SUNXI_ENGINE_H_
>> +#define _SUNXI_ENGINE_H_
>> +
>> +struct sun4i_crtc;
>> +
>> +struct sunxi_engine_ops {
>> +	/* Commit the changes to the engine */
>> +	void (*commit)(void *engine);
>> +	/* Initialize layers (planes) for this engine */
>> +	struct drm_plane **(*layers_init)(struct drm_device *drm,
>> +					  struct sun4i_crtc *crtc);
>> +
>> +	/*
>> +	 * These are optional functions for the TV Encoder. Please check
>> +	 * their presence before calling them.
>> +	 *
>> +	 * The first function applies the color space correction needed
>> +	 * for outputing correct TV signal.
>> +	 *
>> +	 * The second function disabled the correction.
>> +	 */
>> +	void (*apply_color_correction)(void *engine);
>> +	void (*disable_color_correction)(void *engine);
>
>... And have to document it.
>
>Please also use kerneldoc for those comments.
>
>Thanks again!
>Maxime

Re: [PATCH v4 06/11] drm/sun4i: add support for Allwinner DE2 mixers

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1593 bytes --]

On Tue, Apr 18, 2017 at 06:47:56PM +0800, Icenowy Zheng wrote:
> >> +	/* Get the physical address of the buffer in memory */
> >> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
> >> +
> >> +	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
> >> +
> >> +	/* Compute the start of the displayed memory */
> >> +	bpp = fb->format->cpp[0];
> >> +	paddr = gem->paddr + fb->offsets[0];
> >> +	paddr += (state->src_x >> 16) * bpp;
> >> +	paddr += (state->src_y >> 16) * fb->pitches[0];
> >> +
> >> +	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
> >> +
> >> +	paddr_u32 = (uint32_t) paddr;
> >
> >How does that work on 64-bits systems ?
> 
> The hardware is not designed to work on 64-bit systems.
> 
> Even 64-bit A64/H5 has also 3GiB memory limit.

That's a fragile assumption.

> The address cell in mixer hardware is also only 32-bit.
> 
> So we should just keep the force conversion here. If we then really
> met 4GiB-capable AW SoC without changing DE2, I think we should have
> other way to limit CMA pool inside 4GiB.

The register name looks like this is only the lower 32 bits that you
can set here, and that there is another register for the upper 32 bits
of that address somewhere.

In that case, please use the lower_32_bits and upper_32_bits helper,
and don't cast it that way.

If it isn't the case, you should set the DMA mask (through
dma_set_mask) so that we only allocate memory that can be accessed by
this device.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v4 01/11] dt-bindings: add binding for the Allwinner DE2 CCU

[Rob Herring]

On Sun, Apr 16, 2017 at 08:08:39PM +0800, Icenowy Zheng wrote:
> Allwinner "Display Engine 2.0" contains some clock controls in it.
> 
> In order to add them as clock drivers, we need a device tree binding.
> Add the binding here.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> Changes in v4:
> - Dropped the leading 0 in clock@1000000 .
> Changes in v3:
> - Fill the address space length of DE2 CCU to 0x100000, just reach the start of mixer0.
> 
>  .../devicetree/bindings/clock/sun8i-de2.txt        | 31 ++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/sun8i-de2.txt

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 02/11] clk: sunxi-ng: add support for DE2 CCU

[Rob Herring]

On Sun, Apr 16, 2017 at 08:08:40PM +0800, Icenowy Zheng wrote:
> The "Display Engine 2.0" in Allwinner newer SoCs contains a clock
> management unit for its subunits, like the DE CCU in A80.
> 
> Add a sunxi-ng style driver for it.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> Changes in v4:
> - Fixed the inconsistence between mixer_div clocks' number and real clock.
> Changes in v2:
> - Rename sunxi-de2-ccu to sun8i-de2-ccu.
> 
>  drivers/clk/sunxi-ng/Kconfig          |   5 +
>  drivers/clk/sunxi-ng/Makefile         |   1 +
>  drivers/clk/sunxi-ng/ccu-sun8i-de2.c  | 218 ++++++++++++++++++++++++++++++++++
>  drivers/clk/sunxi-ng/ccu-sun8i-de2.h  |  28 +++++
>  include/dt-bindings/clock/sun8i-de2.h |  54 +++++++++
>  include/dt-bindings/reset/sun8i-de2.h |  50 ++++++++

These 2 includes belong with the binding patch.

>  6 files changed, 356 insertions(+)
>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.c
>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun8i-de2.h
>  create mode 100644 include/dt-bindings/clock/sun8i-de2.h
>  create mode 100644 include/dt-bindings/reset/sun8i-de2.h


> diff --git a/include/dt-bindings/clock/sun8i-de2.h b/include/dt-bindings/clock/sun8i-de2.h
> new file mode 100644
> index 000000000000..982c6d18c75b
> --- /dev/null
> +++ b/include/dt-bindings/clock/sun8i-de2.h
> @@ -0,0 +1,54 @@
> +/*
> + * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
> + *
> + * This file is dual-licensed: you can use it either under the terms
> + * of the GPL or the X11 license, at your option. Note that this dual
> + * licensing only applies to this file, and not this project as a
> + * whole.
> + *
> + *  a) This file 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.
> + *
> + *     This file is distributed in the hope that 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.
> + *
> + * Or, alternatively,
> + *
> + *  b) Permission is hereby granted, free of charge, to any person
> + *     obtaining a copy of this software and associated documentation
> + *     files (the "Software"), to deal in the Software without
> + *     restriction, including without limitation the rights to use,
> + *     copy, modify, merge, publish, distribute, sublicense, and/or
> + *     sell copies of the Software, and to permit persons to whom the
> + *     Software is furnished to do so, subject to the following
> + *     conditions:
> + *
> + *     The above copyright notice and this permission notice shall be
> + *     included in all copies or substantial portions of the Software.
> + *
> + *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
> + *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
> + *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
> + *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + *     OTHER DEALINGS IN THE SOFTWARE.
> + */

You can use SPDX tag here:

SPDX-License-Identifier: (GPL-2.0+ OR MIT)

> +
> +#ifndef _DT_BINDINGS_CLOCK_SUN8I_DE2_H_
> +#define _DT_BINDINGS_CLOCK_SUN8I_DE2_H_
> +
> +#define CLK_BUS_MIXER0		0
> +#define CLK_BUS_MIXER1		1
> +#define CLK_BUS_WB		2
> +
> +#define CLK_MIXER0		6
> +#define CLK_MIXER1		7
> +#define CLK_WB			8
> +
> +#endif /* _DT_BINDINGS_CLOCK_SUN8I_DE2_H_ */
> diff --git a/include/dt-bindings/reset/sun8i-de2.h b/include/dt-bindings/reset/sun8i-de2.h
> new file mode 100644
> index 000000000000..52af2dc55376
> --- /dev/null
> +++ b/include/dt-bindings/reset/sun8i-de2.h
> @@ -0,0 +1,50 @@
> +/*
> + * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
> + *
> + * This file is dual-licensed: you can use it either under the terms
> + * of the GPL or the X11 license, at your option. Note that this dual
> + * licensing only applies to this file, and not this project as a
> + * whole.
> + *
> + *  a) This file 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.
> + *
> + *     This file is distributed in the hope that 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.
> + *
> + * Or, alternatively,
> + *
> + *  b) Permission is hereby granted, free of charge, to any person
> + *     obtaining a copy of this software and associated documentation
> + *     files (the "Software"), to deal in the Software without
> + *     restriction, including without limitation the rights to use,
> + *     copy, modify, merge, publish, distribute, sublicense, and/or
> + *     sell copies of the Software, and to permit persons to whom the
> + *     Software is furnished to do so, subject to the following
> + *     conditions:
> + *
> + *     The above copyright notice and this permission notice shall be
> + *     included in all copies or substantial portions of the Software.
> + *
> + *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
> + *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
> + *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
> + *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + *     OTHER DEALINGS IN THE SOFTWARE.
> + */

And here.

Rob

Re: [PATCH v4 03/11] dt-bindings: add bindings for DE2 on V3s SoC

[Rob Herring]

On Sun, Apr 16, 2017 at 08:08:41PM +0800, Icenowy Zheng wrote:
> Allwinner V3s SoC have a display engine which have a different pipeline
> with older SoCs.
> 
> Add document for it (new compatibles and the new "mixer" part).
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> Changes in v4:
> - Removed the refactor at TCON chapter.
> 
> Changes in v3:
> - Remove the description of having a BE directly as allwinner,pipeline.
> 
>  .../bindings/display/sunxi/sun4i-drm.txt           | 29 ++++++++++++++++++++--
>  1 file changed, 27 insertions(+), 2 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 02/11] clk: sunxi-ng: add support for DE2 CCU

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 2971 bytes --]

Hi Rob,

On Thu, Apr 20, 2017 at 09:02:53AM -0500, Rob Herring wrote:
> On Sun, Apr 16, 2017 at 08:08:40PM +0800, Icenowy Zheng wrote:
> > diff --git a/include/dt-bindings/clock/sun8i-de2.h b/include/dt-bindings/clock/sun8i-de2.h
> > new file mode 100644
> > index 000000000000..982c6d18c75b
> > --- /dev/null
> > +++ b/include/dt-bindings/clock/sun8i-de2.h
> > @@ -0,0 +1,54 @@
> > +/*
> > + * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
> > + *
> > + * This file is dual-licensed: you can use it either under the terms
> > + * of the GPL or the X11 license, at your option. Note that this dual
> > + * licensing only applies to this file, and not this project as a
> > + * whole.
> > + *
> > + *  a) This file 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.
> > + *
> > + *     This file is distributed in the hope that 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.
> > + *
> > + * Or, alternatively,
> > + *
> > + *  b) Permission is hereby granted, free of charge, to any person
> > + *     obtaining a copy of this software and associated documentation
> > + *     files (the "Software"), to deal in the Software without
> > + *     restriction, including without limitation the rights to use,
> > + *     copy, modify, merge, publish, distribute, sublicense, and/or
> > + *     sell copies of the Software, and to permit persons to whom the
> > + *     Software is furnished to do so, subject to the following
> > + *     conditions:
> > + *
> > + *     The above copyright notice and this permission notice shall be
> > + *     included in all copies or substantial portions of the Software.
> > + *
> > + *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > + *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
> > + *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> > + *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
> > + *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
> > + *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > + *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > + *     OTHER DEALINGS IN THE SOFTWARE.
> > + */
> 
> You can use SPDX tag here:
> 
> SPDX-License-Identifier: (GPL-2.0+ OR MIT)

I don't think you ever addressed Russell's comment about what would
happen to the license if and when the SPDX doc is changed or goes
offline?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v4 05/11] drm/sun4i: abstract a engine type

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 1046 bytes --]

On Tue, Apr 18, 2017 at 07:05:12PM +0800, Icenowy Zheng wrote:
> >> @@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc
> >*crtc,
> >>  
> >>  	DRM_DEBUG_DRIVER("Committing plane changes\n");
> >>  
> >> -	sun4i_backend_commit(scrtc->backend);
> >> +	scrtc->engine_ops->commit(scrtc->engine);
> >
> >You rely on the backend having setup things properly, which is pretty
> >fragile. Ideally, you should have a function to check that engine_ops
> >and commit is !NULL, and call it, and the consumers would use that
> >function...
> 
> If it's really NULL how should the function return?

It depends on the return code. ENOSYS if it returns an int, and simply
does nothing if it's a void. I don't think any of the current
functions return an error code at the moment though, so I'd just keep
the current behaviour and just call the function if it's set.

You cannot fail in atomic_flush anyway.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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Re: [PATCH v4 02/11] clk: sunxi-ng: add support for DE2 CCU

[Rob Herring]

On Thu, Apr 20, 2017 at 9:36 AM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> Hi Rob,
>
> On Thu, Apr 20, 2017 at 09:02:53AM -0500, Rob Herring wrote:
>> On Sun, Apr 16, 2017 at 08:08:40PM +0800, Icenowy Zheng wrote:
>> > diff --git a/include/dt-bindings/clock/sun8i-de2.h b/include/dt-bindings/clock/sun8i-de2.h
>> > new file mode 100644
>> > index 000000000000..982c6d18c75b
>> > --- /dev/null
>> > +++ b/include/dt-bindings/clock/sun8i-de2.h
>> > @@ -0,0 +1,54 @@
>> > +/*
>> > + * Copyright (C) 2016 Icenowy Zheng <icenowy@aosc.io>
>> > + *
>> > + * This file is dual-licensed: you can use it either under the terms
>> > + * of the GPL or the X11 license, at your option. Note that this dual
>> > + * licensing only applies to this file, and not this project as a
>> > + * whole.
>> > + *
>> > + *  a) This file 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.
>> > + *
>> > + *     This file is distributed in the hope that 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.
>> > + *
>> > + * Or, alternatively,
>> > + *
>> > + *  b) Permission is hereby granted, free of charge, to any person
>> > + *     obtaining a copy of this software and associated documentation
>> > + *     files (the "Software"), to deal in the Software without
>> > + *     restriction, including without limitation the rights to use,
>> > + *     copy, modify, merge, publish, distribute, sublicense, and/or
>> > + *     sell copies of the Software, and to permit persons to whom the
>> > + *     Software is furnished to do so, subject to the following
>> > + *     conditions:
>> > + *
>> > + *     The above copyright notice and this permission notice shall be
>> > + *     included in all copies or substantial portions of the Software.
>> > + *
>> > + *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> > + *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
>> > + *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
>> > + *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
>> > + *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
>> > + *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>> > + *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
>> > + *     OTHER DEALINGS IN THE SOFTWARE.
>> > + */
>>
>> You can use SPDX tag here:
>>
>> SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>
> I don't think you ever addressed Russell's comment about what would
> happen to the license if and when the SPDX doc is changed or goes
> offline?

Frankly, it's a copyright holders decision what they want to use. SPDX
is already used in the kernel. Look in the USB subsystem. SPDX is not
going anywhere and is endorsed by companies with well known legal
depts. If people want to argue about it still, then I've got better
things to do.

Rob

Re: [PATCH v4 06/11] drm/sun4i: add support for Allwinner DE2 mixers

[icenowy]

于 2017年4月20日 GMT+08:00 下午4:37:07, Maxime Ripard 
<maxime.ripard@free-electrons.com> 写到:
> On Tue, Apr 18, 2017 at 06:47:56PM +0800, Icenowy Zheng wrote:
>> >> +	/* Get the physical address of the buffer in memory */
>> >> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
>> >> +
>> >> +	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
>> >> +
>> >> +	/* Compute the start of the displayed memory */
>> >> +	bpp = fb->format->cpp[0];
>> >> +	paddr = gem->paddr + fb->offsets[0];
>> >> +	paddr += (state->src_x >> 16) * bpp;
>> >> +	paddr += (state->src_y >> 16) * fb->pitches[0];
>> >> +
>> >> +	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
>> >> +
>> >> +	paddr_u32 = (uint32_t) paddr;
>> >
>> >How does that work on 64-bits systems ?
>> 
>> The hardware is not designed to work on 64-bit systems.
>> 
>> Even 64-bit A64/H5 has also 3GiB memory limit.
> 
> That's a fragile assumption.

Yes, it's only the basical reason.

> 
>> The address cell in mixer hardware is also only 32-bit.
>> 
>> So we should just keep the force conversion here. If we then really
>> met 4GiB-capable AW SoC without changing DE2, I think we should have
>> other way to limit CMA pool inside 4GiB.
> 
> The register name looks like this is only the lower 32 bits that you
> can set here, and that there is another register for the upper 32 bits
> of that address somewhere.

Maybe... but no one can verify this as their's no currently any user
which has 4GiB+ DRAM.

I think we should keep this until Allwinner really made a 4GiB-capable
hardware.

> 
> In that case, please use the lower_32_bits and upper_32_bits helper,
> and don't cast it that way.
> 
> If it isn't the case, you should set the DMA mask (through
> dma_set_mask) so that we only allocate memory that can be accessed by
> this device.

How to do it?

> 
> Maxime