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Commit 96976c3d authored by Ajay Kumar's avatar Ajay Kumar Committed by Inki Dae
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drm/exynos: Add DECON driver 

This patch is based on exynos-drm-next branch of Inki Dae's tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git



DECON(Display and Enhancement Controller) is the new IP
in exynos7 SOC for generating video signals using pixel data.

DECON driver can be used to drive 2 different interfaces on Exynos7:
DECON-INT(video controller) and DECON-EXT(Mixer for HDMI)

The existing FIMD driver code was used as a template to create
DECON driver. Only DECON-INT is supported as of now, and
DECON-EXT support will be added later.

The current version of the driver supports video mode displays.

Changelog v2:
- Change config name, DRM_EXYNOS_DECON to DRM_EXYNOS7_DECON.

Signed-off-by: default avatarAkshu Agrawal <akshua@gmail.com>
Signed-off-by: default avatarAjay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 936ce5cc

Documentation/devicetree/bindings/video/exynos7-decon.txt

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Device-Tree bindings for Samsung Exynos7 SoC display controller (DECON)



DECON (Display and Enhancement Controller) is the Display Controller for the

Exynos7 series of SoCs which transfers the image data from a video memory

buffer to an external LCD interface.



Required properties:

- compatible: value should be "samsung,exynos7-decon";



- reg: physical base address and length of the DECON registers set.



- interrupt-parent: should be the phandle of the decon controller's

		parent interrupt controller.



- interrupts: should contain a list of all DECON IP block interrupts in the

		 order: FIFO Level, VSYNC, LCD_SYSTEM. The interrupt specifier

		 format depends on the interrupt controller used.



- interrupt-names: should contain the interrupt names: "fifo", "vsync",

	"lcd_sys", in the same order as they were listed in the interrupts

        property.



- pinctrl-0: pin control group to be used for this controller.



- pinctrl-names: must contain a "default" entry.



- clocks: must include clock specifiers corresponding to entries in the

         clock-names property.



- clock-names: list of clock names sorted in the same order as the clocks

               property. Must contain "pclk_decon0", "aclk_decon0",

	       "decon0_eclk", "decon0_vclk".

- i80-if-timings: timing configuration for lcd i80 interface support.



Optional Properties:

- samsung,power-domain: a phandle to DECON power domain node.

- display-timings: timing settings for DECON, as described in document [1].

		Can be used in case timings cannot be provided otherwise

		or to override timings provided by the panel.



[1]: Documentation/devicetree/bindings/video/display-timing.txt



Example:



SoC specific DT entry:



	decon@13930000 {

		compatible = "samsung,exynos7-decon";

		interrupt-parent = <&combiner>;

		reg = <0x13930000 0x1000>;

		interrupt-names = "lcd_sys", "vsync", "fifo";

		interrupts = <0 188 0>, <0 189 0>, <0 190 0>;

		clocks = <&clock_disp PCLK_DECON_INT>,

			 <&clock_disp ACLK_DECON_INT>,

			 <&clock_disp SCLK_DECON_INT_ECLK>,

			 <&clock_disp SCLK_DECON_INT_EXTCLKPLL>;

		clock-names = "pclk_decon0", "aclk_decon0", "decon0_eclk",

				"decon0_vclk";

		status = "disabled";

	};



Board specific DT entry:



	decon@13930000 {

		pinctrl-0 = <&lcd_clk &pwm1_out>;

		pinctrl-names = "default";

		status = "okay";

	};

drivers/gpu/drm/exynos/Kconfig

+10 −3
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@@ -24,9 +24,16 @@ config DRM_EXYNOS_FIMD 
	help

	  Choose this option if you want to use Exynos FIMD for DRM.



config DRM_EXYNOS7_DECON

	bool "Exynos DRM DECON"

	depends on DRM_EXYNOS

	select FB_MODE_HELPERS

	help

	  Choose this option if you want to use Exynos DECON for DRM.



config DRM_EXYNOS_DPI

	bool "EXYNOS DRM parallel output support"

	depends on DRM_EXYNOS_FIMD

	depends on (DRM_EXYNOS_FIMD || DRM_EXYNOS7_DECON)

	select DRM_PANEL

	default n

	help
@@ -34,7 +41,7 @@ config DRM_EXYNOS_DPI 


config DRM_EXYNOS_DSI

	bool "EXYNOS DRM MIPI-DSI driver support"

	depends on DRM_EXYNOS_FIMD

	depends on (DRM_EXYNOS_FIMD || DRM_EXYNOS7_DECON)

	select DRM_MIPI_DSI

	select DRM_PANEL

	default n
@@ -43,7 +50,7 @@ config DRM_EXYNOS_DSI 


config DRM_EXYNOS_DP

	bool "EXYNOS DRM DP driver support"

	depends on DRM_EXYNOS_FIMD && ARCH_EXYNOS && (DRM_PTN3460=n || DRM_PTN3460=y || DRM_PTN3460=DRM_EXYNOS)

	depends on (DRM_EXYNOS_FIMD || DRM_EXYNOS7DECON) && ARCH_EXYNOS && (DRM_PTN3460=n || DRM_PTN3460=y || DRM_PTN3460=DRM_EXYNOS)

	default DRM_EXYNOS

	select DRM_PANEL

	help

drivers/gpu/drm/exynos/Makefile

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@@ -10,6 +10,7 @@ exynosdrm-y := exynos_drm_drv.o exynos_drm_encoder.o \ 


exynosdrm-$(CONFIG_DRM_EXYNOS_IOMMU) += exynos_drm_iommu.o

exynosdrm-$(CONFIG_DRM_EXYNOS_FIMD)	+= exynos_drm_fimd.o

exynosdrm-$(CONFIG_DRM_EXYNOS7_DECON)	+= exynos7_drm_decon.o

exynosdrm-$(CONFIG_DRM_EXYNOS_DPI)	+= exynos_drm_dpi.o

exynosdrm-$(CONFIG_DRM_EXYNOS_DSI)	+= exynos_drm_dsi.o

exynosdrm-$(CONFIG_DRM_EXYNOS_DP)	+= exynos_dp_core.o exynos_dp_reg.o

drivers/gpu/drm/exynos/exynos7_drm_decon.c

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File added.

Preview size limit exceeded, changes collapsed.

drivers/gpu/drm/exynos/exynos_drm_drv.c

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@@ -556,6 +556,9 @@ static struct platform_driver *const exynos_drm_kms_drivers[] = { 
#ifdef CONFIG_DRM_EXYNOS_FIMD

	&fimd_driver,

#endif

#ifdef CONFIG_DRM_EXYNOS7_DECON

	&decon_driver,

#endif

#ifdef CONFIG_DRM_EXYNOS_DP

	&dp_driver,

#endif
@@ -612,6 +615,7 @@ static const char * const strings[] = { 
	"samsung,exynos3",

	"samsung,exynos4",

	"samsung,exynos5",

	"samsung,exynos7",

};



static struct platform_driver exynos_drm_platform_driver = {