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Commit 19022aaa authored by Sascha Hauer's avatar Sascha Hauer Committed by Greg Kroah-Hartman
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staging: drm/imx: Add parallel display support 



This adds support for parallel displays for i.MX. It consists
of a drm encoder/connector pair which eventually passes EDID
data from the devicetree to the drm core.

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e692da4d

drivers/staging/imx-drm/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -15,3 +15,7 @@ config DRM_IMX_FB_HELPER 
	  The DRM framework can provide a legacy /dev/fb0 framebuffer

	  for your device. This is necessary to get a framebuffer console

	  and also for appplications using the legacy framebuffer API



config DRM_IMX_PARALLEL_DISPLAY

	tristate "Support for parallel displays"

	depends on DRM_IMX

drivers/staging/imx-drm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,4 +3,5 @@ imxdrm-objs := imx-drm-core.o imx-fb.o 


obj-$(CONFIG_DRM_IMX) += imxdrm.o



obj-$(CONFIG_DRM_IMX_PARALLEL_DISPLAY) += parallel-display.o

obj-$(CONFIG_DRM_IMX_FB_HELPER) += imx-fbdev.o

drivers/staging/imx-drm/parallel-display.c

0 → 100644
+261 −0
Original line number Diff line number Diff line 
/*

 * i.MX drm driver - parallel display implementation

 *

 * Copyright (C) 2012 Sascha Hauer, Pengutronix

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA 02110-1301, USA.

 */



#include <linux/module.h>

#include <drm/drmP.h>

#include <drm/drm_fb_helper.h>

#include <drm/drm_crtc_helper.h>

#include <linux/videodev2.h>



#include "imx-drm.h"



#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)

#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)



struct imx_parallel_display {

	struct drm_connector connector;

	struct imx_drm_connector *imx_drm_connector;

	struct drm_encoder encoder;

	struct imx_drm_encoder *imx_drm_encoder;

	struct device *dev;

	void *edid;

	int edid_len;

	u32 interface_pix_fmt;

	int mode_valid;

	struct drm_display_mode mode;

};



static enum drm_connector_status imx_pd_connector_detect(

		struct drm_connector *connector, bool force)

{

	return connector_status_connected;

}



static void imx_pd_connector_destroy(struct drm_connector *connector)

{

	/* do not free here */

}



static int imx_pd_connector_get_modes(struct drm_connector *connector)

{

	struct imx_parallel_display *imxpd = con_to_imxpd(connector);

	int num_modes = 0;



	if (imxpd->edid) {

		drm_mode_connector_update_edid_property(connector, imxpd->edid);

		num_modes = drm_add_edid_modes(connector, imxpd->edid);

	}



	if (imxpd->mode_valid) {

		struct drm_display_mode *mode = drm_mode_create(connector->dev);

		drm_mode_copy(mode, &imxpd->mode);

		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,

		drm_mode_probed_add(connector, mode);

		num_modes++;

	}



	return num_modes;

}



static int imx_pd_connector_mode_valid(struct drm_connector *connector,

			  struct drm_display_mode *mode)

{

	return 0;

}



static struct drm_encoder *imx_pd_connector_best_encoder(

		struct drm_connector *connector)

{

	struct imx_parallel_display *imxpd = con_to_imxpd(connector);



	return &imxpd->encoder;

}



static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)

{

}



static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,

			   const struct drm_display_mode *mode,

			   struct drm_display_mode *adjusted_mode)

{

	return true;

}



static void imx_pd_encoder_prepare(struct drm_encoder *encoder)

{

	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);



	imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,

			imxpd->interface_pix_fmt);

}



static void imx_pd_encoder_commit(struct drm_encoder *encoder)

{

}



static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,

			 struct drm_display_mode *mode,

			 struct drm_display_mode *adjusted_mode)

{

}



static void imx_pd_encoder_disable(struct drm_encoder *encoder)

{

}



static void imx_pd_encoder_destroy(struct drm_encoder *encoder)

{

	/* do not free here */

}



static struct drm_connector_funcs imx_pd_connector_funcs = {

	.dpms = drm_helper_connector_dpms,

	.fill_modes = drm_helper_probe_single_connector_modes,

	.detect = imx_pd_connector_detect,

	.destroy = imx_pd_connector_destroy,

};



static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {

	.get_modes = imx_pd_connector_get_modes,

	.best_encoder = imx_pd_connector_best_encoder,

	.mode_valid = imx_pd_connector_mode_valid,

};



static struct drm_encoder_funcs imx_pd_encoder_funcs = {

	.destroy = imx_pd_encoder_destroy,

};



static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {

	.dpms = imx_pd_encoder_dpms,

	.mode_fixup = imx_pd_encoder_mode_fixup,

	.prepare = imx_pd_encoder_prepare,

	.commit = imx_pd_encoder_commit,

	.mode_set = imx_pd_encoder_mode_set,

	.disable = imx_pd_encoder_disable,

};



static int imx_pd_register(struct imx_parallel_display *imxpd)

{

	int ret;



	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);



	imxpd->connector.funcs = &imx_pd_connector_funcs;

	imxpd->encoder.funcs = &imx_pd_encoder_funcs;



	imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;

	imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;



	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);

	ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,

			THIS_MODULE);

	if (ret) {

		dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);

		return ret;

	}



	drm_connector_helper_add(&imxpd->connector,

			&imx_pd_connector_helper_funcs);



	ret = imx_drm_add_connector(&imxpd->connector,

			&imxpd->imx_drm_connector, THIS_MODULE);

	if (ret) {

		imx_drm_remove_encoder(imxpd->imx_drm_encoder);

		dev_err(imxpd->dev, "adding connector failed with %d\n", ret);

		return ret;

	}



	imxpd->connector.encoder = &imxpd->encoder;



	return 0;

}



static int __devinit imx_pd_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	const u8 *edidp;

	struct imx_parallel_display *imxpd;

	int ret;

	const char *fmt;



	imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);

	if (!imxpd)

		return -ENOMEM;



	edidp = of_get_property(np, "edid", &imxpd->edid_len);

	if (edidp)

		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);



	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);

	if (!ret) {

		if (!strcmp(fmt, "rgb24"))

			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;

		else if (!strcmp(fmt, "rgb565"))

			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;

	}



	imxpd->dev = &pdev->dev;



	ret = imx_pd_register(imxpd);

	if (ret)

		return ret;



	ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);



	platform_set_drvdata(pdev, imxpd);



	return 0;

}



static int __devexit imx_pd_remove(struct platform_device *pdev)

{

	struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);

	struct drm_connector *connector = &imxpd->connector;

	struct drm_encoder *encoder = &imxpd->encoder;



	drm_mode_connector_detach_encoder(connector, encoder);



	imx_drm_remove_connector(imxpd->imx_drm_connector);

	imx_drm_remove_encoder(imxpd->imx_drm_encoder);



	return 0;

}



static const struct of_device_id imx_pd_dt_ids[] = {

	{ .compatible = "fsl,imx-parallel-display", },

	{ /* sentinel */ }

};



static struct platform_driver imx_pd_driver = {

	.probe		= imx_pd_probe,

	.remove		= __devexit_p(imx_pd_remove),

	.driver		= {

		.of_match_table = imx_pd_dt_ids,

		.name	= "imx-parallel-display",

		.owner	= THIS_MODULE,

	},

};



module_platform_driver(imx_pd_driver);



MODULE_DESCRIPTION("i.MX parallel display driver");

MODULE_AUTHOR("Sascha Hauer, Pengutronix");

MODULE_LICENSE("GPL");