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Commit dec72739 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: Add DSI support 



This commit adds support for both DSI outputs found on Tegra. Only very
minimal functionality is implemented, so advanced features like ganged
mode won't work.

Due to the lack of other test hardware, some sections of the driver are
hardcoded to work with Dalmore.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent b5190022

Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt

+10 −0
Original line number Diff line number Diff line
@@ -171,11 +171,21 @@ of the following host1x client modules: 
  - clock-names: Must include the following entries:

    - dsi

      This MUST be the first entry.

    - lp

    - parent

  - resets: Must contain an entry for each entry in reset-names.

    See ../reset/reset.txt for details.

  - reset-names: Must include the following entries:

    - dsi

  - nvidia,mipi-calibrate: Should contain a phandle and a specifier specifying

    which pads are used by this DSI output and need to be calibrated. See also

    ../mipi/nvidia,tegra114-mipi.txt.



  Optional properties:

  - nvidia,ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing

  - nvidia,hpd-gpio: specifies a GPIO used for hotplug detection

  - nvidia,edid: supplies a binary EDID blob

  - nvidia,panel: phandle of a display panel



Example:

drivers/gpu/drm/tegra/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ config DRM_TEGRA 
	select TEGRA_HOST1X

	select DRM_KMS_HELPER

	select DRM_KMS_FB_HELPER

	select DRM_MIPI_DSI

	select DRM_PANEL

	select FB_SYS_FILLRECT

	select FB_SYS_COPYAREA

drivers/gpu/drm/tegra/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -9,6 +9,8 @@ tegra-drm-y := \ 
	output.o \

	rgb.o \

	hdmi.o \

	mipi-phy.o \

	dsi.o \

	gr2d.o \

	gr3d.o

drivers/gpu/drm/tegra/dc.h

+2 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#define DISP_CTRL_MODE_STOP (0 << 5)

#define DISP_CTRL_MODE_C_DISPLAY (1 << 5)

#define DISP_CTRL_MODE_NC_DISPLAY (2 << 5)

#define DISP_CTRL_MODE_MASK (3 << 5)

#define DC_CMD_SIGNAL_RAISE			0x033

#define DC_CMD_DISPLAY_POWER_CONTROL		0x036

#define PW0_ENABLE (1 <<  0)
@@ -116,6 +117,7 @@ 


#define DC_DISP_DISP_WIN_OPTIONS		0x402

#define HDMI_ENABLE (1 << 30)

#define DSI_ENABLE  (1 << 29)



#define DC_DISP_DISP_MEM_HIGH_PRIORITY		0x403

#define CURSOR_THRESHOLD(x)   (((x) & 0x03) << 24)

drivers/gpu/drm/tegra/drm.c

+9 −1
Original line number Diff line number Diff line
@@ -653,6 +653,7 @@ static const struct of_device_id host1x_drm_subdevs[] = { 
	{ .compatible = "nvidia,tegra30-hdmi", },

	{ .compatible = "nvidia,tegra30-gr2d", },

	{ .compatible = "nvidia,tegra30-gr3d", },

	{ .compatible = "nvidia,tegra114-dsi", },

	{ .compatible = "nvidia,tegra114-hdmi", },

	{ .compatible = "nvidia,tegra114-gr3d", },

	{ /* sentinel */ }
@@ -677,10 +678,14 @@ static int __init host1x_drm_init(void) 
	if (err < 0)

		goto unregister_host1x;



	err = platform_driver_register(&tegra_hdmi_driver);

	err = platform_driver_register(&tegra_dsi_driver);

	if (err < 0)

		goto unregister_dc;



	err = platform_driver_register(&tegra_hdmi_driver);

	if (err < 0)

		goto unregister_dsi;



	err = platform_driver_register(&tegra_gr2d_driver);

	if (err < 0)

		goto unregister_hdmi;
@@ -695,6 +700,8 @@ static int __init host1x_drm_init(void) 
	platform_driver_unregister(&tegra_gr2d_driver);

unregister_hdmi:

	platform_driver_unregister(&tegra_hdmi_driver);

unregister_dsi:

	platform_driver_unregister(&tegra_dsi_driver);

unregister_dc:

	platform_driver_unregister(&tegra_dc_driver);

unregister_host1x:
@@ -708,6 +715,7 @@ static void __exit host1x_drm_exit(void) 
	platform_driver_unregister(&tegra_gr3d_driver);

	platform_driver_unregister(&tegra_gr2d_driver);

	platform_driver_unregister(&tegra_hdmi_driver);

	platform_driver_unregister(&tegra_dsi_driver);

	platform_driver_unregister(&tegra_dc_driver);

	host1x_driver_unregister(&host1x_drm_driver);

}