Merge branch 'drm_kms_for_next-v8' of git://git.linaro.org/people/ben…

…jamin.gaignard/kernel into drm-next

This series of patches add the support of DRM/KMS drivers for STMicroelectronics
chipsets stih416 and stih407.

Hardware is split in two main blocks: Compositor and TVout. Each of them
includes specific hardware IPs and the display timing are controlled by a specific
Video Timing Generator hardware IP (VTG).

Compositor is made of the follow hardware IPs:
 - GDP (Generic Display Pipeline) which is an entry point for graphic (RGB)
   buffers
 - VDP (Video Diplay Pipeline) which is an entry point for video (YUV) buffers
 - HQVDP (High Quality Video Display Processor) that supports scaling,
   deinterlacing and some miscellaneous image quality improvements.
   It fetches the Video decoded buffers from memory, processes them and pushes
   them to the Compositor through a HW dedicated bus.
 - Mixer is responsible of mixing all the entries depending of their
   respective z-order and layout

TVout is divided in 3 parts:
 - HDMI to generate HDMI signals, depending of chipset version HDMI phy can
   change.
 - HDA to generate signals for HD analog TV
 - VIP to control/switch data path coming from Compositor

On stih416 compositor and Tvout are on different dies so a Video Trafic Advance
inter-die Communication mechanism (VTAC) is needed.

+---------------------------------------------+   +----------------------------------------+
| +-------------------------------+   +----+  |   |  +----+   +--------------------------+ |
| |                               |   |    |  |   |  |    |   |  +---------+     +----+  | |
| | +----+              +------+  |   |    |  |   |  |    |   |  | VIP     |---->|HDMI|  | |
| | |GPD +------------->|      |  |   |    |  |   |  |    |   |  |         |     +----+  | |
| | +----+              |Mixer |--|-->|    |  |   |  |    |---|->| switcher|             | |
| |                     |      |  |   |    |  |   |  |    |   |  |         |     +----+  | |
| |                     |      |  |   |    |  |   |  |    |   |  |         |---->|HDA |  | |
| |                     +------+  |   |VTAC|========>|VTAC|   |  +---------+     +----+  | |
| |                               |   |    |  |   |  |    |   |                          | |
| |         Compositor            |   |    |  |   |  |    |   |           TVout          | |
| +-------------------------------+   |    |  |   |  |    |   +--------------------------+ |
|                      ^              |    |  |   |  |    |             ^                  |
|                      |              |    |  |   |  |    |             |                  |
|               +--------------+      |    |  |   |  |    |      +-------------+           |
|               | VTG (master) |----->|    |  |   |  |    |----->| VTG (slave) |           |
|               +--------------+      +----+  |   |  +----+      +-------------+           |
|Digital die                                  |   |                              Analog Die|
+---------------------------------------------+   +----------------------------------------+

On stih407 Compositor and Tvout are on the same die

+-----------------------------------------------------------------+
| +-------------------------------+  +--------------------------+ |
| |                               |  |  +---------+     +----+  | |
| | +----+              +------+  |  |  | VIP     |---->|HDMI|  | |
| | |GPD +------------->|      |  |  |  |         |     +----+  | |
| | +----+              |Mixer |--|--|->| switcher|             | |
| | +----+   +-----+    |      |  |  |  |         |     +----+  | |
| | |VDP +-->+HQVDP+--->|      |  |  |  |         |---->|HDA |  | |
| | +----+   +-----+    +------+  |  |  +---------+     +----+  | |
| |                               |  |                          | |
| |         Compositor            |  |           TVout          | |
| +-------------------------------+  +--------------------------+ |
|                              ^        ^                         |
|                              |        |                         |
|                           +--------------+                      |
|                           |     VTG      |                      |
|                           +--------------+                      |
|Digital die                                                      |
+-----------------------------------------------------------------+

In addition of the drivers for the IPs listed before a thin I2C driver (hdmiddc) is used
by HDMI driver to retrieve EDID for monitor.

To unify interfaces of GDP and VDP we create a "layer" interface called by
compositor to control both GPD and VDP.

Hardware have memory contraints (alignment, contiguous) so we use CMA drm helpers functions
to allocate frame buffer.

File naming convention is:
 - sti_* for IPs drivers
 - sti_drm_* for drm functions implementation.

* 'drm_kms_for_next-v8' of git://git.linaro.org/people/benjamin.gaignard/kernel:
  drm: sti: Add DRM driver itself
  drm: sti: add Compositor
  drm: sti: add Mixer
  drm: sti: add VID layer
  drm: sti: add GDP layer
  drm: sti: add TVOut driver
  drm: sti: add HDA driver
  drm: sti: add HDMI driver
  drm: sti: add VTAC drivers
  drm: sti: add VTG driver
  drm: sti: add bindings for DRM driver

Documentation/devicetree/bindings/gpu/st,stih4xx.txt

@@ -0,0 +1,189 @@
+STMicroelectronics stih4xx platforms
+
+- sti-vtg: video timing generator
+  Required properties:
+  - compatible: "st,vtg"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  Optional properties:
+  - interrupts : VTG interrupt number to the CPU.
+  - st,slave: phandle on a slave vtg
+
+- sti-vtac: video timing advanced inter dye communication Rx and TX
+  Required properties:
+  - compatible: "st,vtac-main" or "st,vtac-aux"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+
+- sti-display-subsystem: Master device for DRM sub-components
+  This device must be the parent of all the sub-components and is responsible
+  of bind them.
+  Required properties:
+  - compatible: "st,sti-display-subsystem"
+  - ranges: to allow probing of subdevices
+
+- sti-compositor: frame compositor engine
+  must be a child of sti-display-subsystem
+  Required properties:
+  - compatible: "st,stih<chip>-compositor"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - resets: resets to be used by the device
+    See ../reset/reset.txt for details.
+  - reset-names: names of the resets listed in resets property in the same
+    order.
+  - st,vtg: phandle(s) on vtg device (main and aux) nodes.
+
+- sti-tvout: video out hardware block
+  must be a child of sti-display-subsystem
+  Required properties:
+  - compatible: "st,stih<chip>-tvout"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - reg-names: names of the mapped memory regions listed in regs property in
+    the same order.
+  - resets: resets to be used by the device
+    See ../reset/reset.txt for details.
+  - reset-names: names of the resets listed in resets property in the same
+    order.
+  - ranges: to allow probing of subdevices
+
+- sti-hdmi: hdmi output block
+  must be a child of sti-tvout
+  Required properties:
+  - compatible: "st,stih<chip>-hdmi";
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - reg-names: names of the mapped memory regions listed in regs property in
+    the same order.
+  - interrupts : HDMI interrupt number to the CPU.
+  - interrupt-names: name of the interrupts listed in interrupts property in
+    the same order
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+  - hdmi,hpd-gpio: gpio id to detect if an hdmi cable is plugged or not.
+
+sti-hda:
+  Required properties:
+  must be a child of sti-tvout
+  - compatible: "st,stih<chip>-hda"
+  - reg: Physical base address of the IP registers and length of memory mapped region.
+  - reg-names: names of the mapped memory regions listed in regs property in
+    the same order.
+  - clocks: from common clock binding: handle hardware IP needed clocks, the
+    number of clocks may depend of the SoC type.
+    See ../clocks/clock-bindings.txt for details.
+  - clock-names: names of the clocks listed in clocks property in the same
+    order.
+
+Example:
+
+/ {
+	...
+
+	vtg_main_slave: sti-vtg-main-slave@fe85A800 {
+		compatible	= "st,vtg";
+		reg		= <0xfe85A800 0x300>;
+		interrupts	= <GIC_SPI 175 IRQ_TYPE_NONE>;
+	};
+
+	vtg_main: sti-vtg-main-master@fd348000 {
+		compatible	= "st,vtg";
+		reg		= <0xfd348000 0x400>;
+		st,slave	= <&vtg_main_slave>;
+	};
+
+	vtg_aux_slave: sti-vtg-aux-slave@fd348400 {
+		compatible	= "st,vtg";
+		reg		= <0xfe858200 0x300>;
+		interrupts	= <GIC_SPI 176 IRQ_TYPE_NONE>;
+	};
+
+	vtg_aux: sti-vtg-aux-master@fd348400 {
+		compatible	= "st,vtg";
+		reg		= <0xfd348400 0x400>;
+		st,slave	= <&vtg_aux_slave>;
+	};
+
+
+	sti-vtac-rx-main@fee82800 {
+		compatible	= "st,vtac-main";
+		reg		= <0xfee82800 0x200>;
+		clock-names     = "vtac";
+		clocks          = <&clk_m_a2_div0 CLK_M_VTAC_MAIN_PHY>;
+	};
+
+	sti-vtac-rx-aux@fee82a00 {
+		compatible	= "st,vtac-aux";
+		reg		= <0xfee82a00 0x200>;
+		clock-names     = "vtac";
+		clocks          = <&clk_m_a2_div0 CLK_M_VTAC_AUX_PHY>;
+	};
+
+	sti-vtac-tx-main@fd349000 {
+		compatible	= "st,vtac-main";
+		reg		= <0xfd349000 0x200>, <0xfd320000 0x10000>;
+		clock-names     = "vtac";
+		clocks           = <&clk_s_a1_hs CLK_S_VTAC_TX_PHY>;
+	};
+
+	sti-vtac-tx-aux@fd349200 {
+		compatible	= "st,vtac-aux";
+		reg		= <0xfd349200 0x200>, <0xfd320000 0x10000>;
+		clock-names     = "vtac";
+		clocks          = <&clk_s_a1_hs CLK_S_VTAC_TX_PHY>;
+	};
+
+	sti-display-subsystem {
+		compatible = "st,sti-display-subsystem";
+		ranges;
+
+		sti-compositor@fd340000 {
+			compatible	= "st,stih416-compositor";
+			reg		= <0xfd340000 0x1000>;
+			clock-names	= "compo_main", "compo_aux",
+			                  "pix_main", "pix_aux";
+			clocks          = <&clk_m_a2_div1 CLK_M_COMPO_MAIN>, <&clk_m_a2_div1 CLK_M_COMPO_AUX>,
+					  <&clockgen_c_vcc CLK_S_PIX_MAIN>, <&clockgen_c_vcc CLK_S_PIX_AUX>;
+			reset-names     = "compo-main", "compo-aux";
+			resets          = <&softreset STIH416_COMPO_M_SOFTRESET>, <&softreset STIH416_COMPO_A_SOFTRESET>;
+			st,vtg		= <&vtg_main>, <&vtg_aux>;
+		};
+
+		sti-tvout@fe000000 {
+			compatible	= "st,stih416-tvout";
+			reg		= <0xfe000000 0x1000>, <0xfe85a000 0x400>, <0xfe830000 0x10000>;
+			reg-names	= "tvout-reg", "hda-reg", "syscfg";
+			reset-names     = "tvout";
+			resets          = <&softreset STIH416_HDTVOUT_SOFTRESET>;
+			ranges;
+
+			sti-hdmi@fe85c000 {
+				compatible	= "st,stih416-hdmi";
+				reg		= <0xfe85c000 0x1000>, <0xfe830000 0x10000>;
+				reg-names	= "hdmi-reg", "syscfg";
+				interrupts	= <GIC_SPI 173 IRQ_TYPE_NONE>;
+				interrupt-names	= "irq";
+				clock-names	= "pix", "tmds", "phy", "audio";
+				clocks          = <&clockgen_c_vcc CLK_S_PIX_HDMI>, <&clockgen_c_vcc CLK_S_TMDS_HDMI>, <&clockgen_c_vcc CLK_S_HDMI_REJECT_PLL>, <&clockgen_b1 CLK_S_PCM_0>;
+				hdmi,hpd-gpio	= <&PIO2 5>;
+			};
+
+			sti-hda@fe85a000 {
+				compatible	= "st,stih416-hda";
+				reg		= <0xfe85a000 0x400>, <0xfe83085c 0x4>;
+				reg-names	= "hda-reg", "video-dacs-ctrl";
+				clock-names	= "pix", "hddac";
+				clocks          = <&clockgen_c_vcc CLK_S_PIX_HD>, <&clockgen_c_vcc CLK_S_HDDAC>;
+			};
+		};
+	};
+	...
+};

drivers/gpu/drm/Kconfig

@@ -201,3 +201,5 @@ source "drivers/gpu/drm/msm/Kconfig"
 source "drivers/gpu/drm/tegra/Kconfig"
 
 source "drivers/gpu/drm/panel/Kconfig"
+
+source "drivers/gpu/drm/sti/Kconfig"

drivers/gpu/drm/Makefile

@@ -64,6 +64,7 @@ obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_BOCHS) += bochs/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
+obj-$(CONFIG_DRM_STI) += sti/
 obj-y			+= i2c/
 obj-y			+= panel/
 obj-y			+= bridge/

drivers/gpu/drm/sti/Kconfig

@@ -0,0 +1,14 @@
+config DRM_STI
+	tristate "DRM Support for STMicroelectronics SoC stiH41x Series"
+	depends on DRM && (SOC_STIH415 || SOC_STIH416 || ARCH_MULTIPLATFORM)
+	select DRM_KMS_HELPER
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_CMA_HELPER
+	help
+	  Choose this option to enable DRM on STM stiH41x chipset
+
+config DRM_STI_FBDEV
+	bool "DRM frame buffer device for STMicroelectronics SoC stiH41x Serie"
+	depends on DRM_STI
+	help
+	  Choose this option to enable FBDEV on top of DRM for STM stiH41x chipset

drivers/gpu/drm/sti/Makefile

@@ -0,0 +1,21 @@
+sticompositor-y := \
+	sti_layer.o \
+	sti_mixer.o \
+	sti_gdp.o \
+	sti_vid.o \
+	sti_compositor.o \
+	sti_drm_crtc.o \
+	sti_drm_plane.o
+
+stihdmi-y := sti_hdmi.o \
+	sti_hdmi_tx3g0c55phy.o \
+	sti_hdmi_tx3g4c28phy.o \
+
+obj-$(CONFIG_DRM_STI) = \
+	sti_vtg.o \
+	sti_vtac.o \
+	stihdmi.o \
+	sti_hda.o \
+	sti_tvout.o \
+	sticompositor.o \
+	sti_drm_drv.o

drivers/gpu/drm/sti/NOTES

@@ -0,0 +1,58 @@
+1. stiH display hardware IP
+---------------------------
+The STMicroelectronics stiH SoCs use a common chain of HW display IP blocks:
+- The High Quality Video Display Processor (HQVDP) gets video frames from a
+  video decoder and does high quality video processing, including scaling.
+
+- The Compositor is a multiplane, dual-mixer (Main & Aux) digital processor. It
+  has several inputs:
+  - The graphics planes are internally processed by the Generic Display
+    Pipeline (GDP).
+  - The video plug (VID) connects to the HQVDP output.
+  - The cursor handles ... a cursor.
+- The TV OUT pre-formats (convert, clip, round) the compositor output data
+- The HDMI / DVO / HD Analog / SD analog IP builds the video signals
+  - DVO (Digital Video Output) handles a 24bits parallel signal
+  - The HD analog signal is typically driven by a YCbCr cable, supporting up to
+    1080i mode.
+  - The SD analog signal is typically used for legacy TV
+- The VTG (Video Timing Generators) build Vsync signals used by the other HW IP
+Note that some stiH drivers support only a subset of thee HW IP.
+
+                  .-------------.   .-----------.   .-----------.
+GPU >-------------+GDP     Main |   |           +---+    HDMI   +--> HDMI
+GPU >-------------+GDP     mixer+---+           |   :===========:
+GPU >-------------+Cursor       |   |           +---+    DVO    +--> 24b//
+        -------   |  COMPOSITOR |   |  TV OUT   |   :===========:
+       |       |  |             |   |           +---+ HD analog +--> YCbCr
+Vid >--+ HQVDP +--+VID     Aux  +---+           |   :===========:
+dec    |       |  |        mixer|   |           +---+ SD analog +--> CVBS
+       '-------'  '-------------'   '-----------'   '-----------'
+                   .-----------.
+                   |       main+--> Vsync
+                   | VTG       |
+                   |        aux+--> Vsync
+                   '-----------'
+
+2. DRM / HW mapping
+-------------------
+These IP are mapped to the DRM objects as following:
+- The CRTCs are mapped to the Compositor Main and Aux Mixers
+- The Framebuffers and planes are mapped to the Compositor GDP (non video
+  buffers) and to HQVDP+VID (video buffers)
+- The Cursor is mapped to the Compositor Cursor
+- The Encoders are mapped to the TVOut
+- The Bridges/Connectors are mapped to the HDMI / DVO / HD Analog / SD analog
+
+FB & planes         Cursor      CRTC     Encoders    Bridges/Connectors
+   |                   |          |         |                       |
+   |                   |          |         |                       |
+   |              .-------------. | .-----------.   .-----------.   |
+   +------------> |GDP |   Main | | |       +-> |   |    HDMI   | <-+
+   +------------> |GDP v   mixer|<+ |       |   |   :===========:   |
+   |              |Cursor       | | |       +-> |   |    DVO    | <-+
+   |    -------   |  COMPOSITOR | | |TV OUT |   |   :===========:   |
+   |   |       |  |             | | |       +-> |   | HD analog | <-+
+   +-> | HQVDP |  |VID     Aux  |<+ |       |   |   :===========:   |
+       |       |  |        mixer|   |       +-> |   | SD analog | <-+
+       '-------'  '-------------'   '-----------'   '-----------'