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: Sascha Hauer s.hauer@pengutronix.de --- drivers/staging/imx-drm/Kconfig | 4 + drivers/staging/imx-drm/Makefile | 1 + drivers/staging/imx-drm/parallel-display.c | 261 ++++++++++++++++++++++++++++ 3 files changed, 266 insertions(+) create mode 100644 drivers/staging/imx-drm/parallel-display.c
diff --git a/drivers/staging/imx-drm/Kconfig b/drivers/staging/imx-drm/Kconfig index 2ef867b..9e27012 100644 --- a/drivers/staging/imx-drm/Kconfig +++ b/drivers/staging/imx-drm/Kconfig @@ -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 diff --git a/drivers/staging/imx-drm/Makefile b/drivers/staging/imx-drm/Makefile index ff825f7..c8f582e 100644 --- a/drivers/staging/imx-drm/Makefile +++ b/drivers/staging/imx-drm/Makefile @@ -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 diff --git a/drivers/staging/imx-drm/parallel-display.c b/drivers/staging/imx-drm/parallel-display.c new file mode 100644 index 0000000..9b51d73 --- /dev/null +++ b/drivers/staging/imx-drm/parallel-display.c @@ -0,0 +1,261 @@ +/* + * 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");