Commit 19022aaa authored by Sascha Hauer's avatar Sascha Hauer Committed by Greg Kroah-Hartman

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
......@@ -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
......@@ -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
/*
* 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");
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