mirror of https://gitee.com/openkylin/linux.git
305 lines
7.9 KiB
C
305 lines
7.9 KiB
C
/*
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* i.MX drm driver - parallel display implementation
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/component.h>
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#include <linux/module.h>
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#include <drm/drmP.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_panel.h>
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#include <linux/videodev2.h>
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#include <video/of_display_timing.h>
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#include "imx-drm.h"
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#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
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#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
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struct imx_parallel_display {
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struct drm_connector connector;
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struct drm_encoder encoder;
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struct device *dev;
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void *edid;
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int edid_len;
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u32 interface_pix_fmt;
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int mode_valid;
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struct drm_display_mode mode;
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struct drm_panel *panel;
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};
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static enum drm_connector_status imx_pd_connector_detect(
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struct drm_connector *connector, bool force)
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{
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return connector_status_connected;
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}
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static int imx_pd_connector_get_modes(struct drm_connector *connector)
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{
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struct imx_parallel_display *imxpd = con_to_imxpd(connector);
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struct device_node *np = imxpd->dev->of_node;
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int num_modes = 0;
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if (imxpd->panel && imxpd->panel->funcs &&
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imxpd->panel->funcs->get_modes) {
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num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
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if (num_modes > 0)
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return num_modes;
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}
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if (imxpd->edid) {
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drm_mode_connector_update_edid_property(connector, imxpd->edid);
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num_modes = drm_add_edid_modes(connector, imxpd->edid);
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}
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if (imxpd->mode_valid) {
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struct drm_display_mode *mode = drm_mode_create(connector->dev);
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if (!mode)
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return -EINVAL;
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drm_mode_copy(mode, &imxpd->mode);
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mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
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drm_mode_probed_add(connector, mode);
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num_modes++;
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}
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if (np) {
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struct drm_display_mode *mode = drm_mode_create(connector->dev);
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if (!mode)
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return -EINVAL;
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of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
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drm_mode_copy(mode, &imxpd->mode);
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mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
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drm_mode_probed_add(connector, mode);
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num_modes++;
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}
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return num_modes;
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}
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static struct drm_encoder *imx_pd_connector_best_encoder(
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struct drm_connector *connector)
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{
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struct imx_parallel_display *imxpd = con_to_imxpd(connector);
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return &imxpd->encoder;
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}
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static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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if (mode != DRM_MODE_DPMS_ON)
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drm_panel_disable(imxpd->panel);
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else
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drm_panel_enable(imxpd->panel);
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}
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static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
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const struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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return true;
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}
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static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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imx_drm_panel_format(encoder, imxpd->interface_pix_fmt);
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}
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static void imx_pd_encoder_commit(struct drm_encoder *encoder)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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drm_panel_prepare(imxpd->panel);
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drm_panel_enable(imxpd->panel);
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}
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static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *orig_mode,
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struct drm_display_mode *mode)
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{
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}
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static void imx_pd_encoder_disable(struct drm_encoder *encoder)
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{
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struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
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drm_panel_disable(imxpd->panel);
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drm_panel_unprepare(imxpd->panel);
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}
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static struct drm_connector_funcs imx_pd_connector_funcs = {
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.dpms = drm_helper_connector_dpms,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.detect = imx_pd_connector_detect,
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.destroy = imx_drm_connector_destroy,
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};
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static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
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.get_modes = imx_pd_connector_get_modes,
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.best_encoder = imx_pd_connector_best_encoder,
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};
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static struct drm_encoder_funcs imx_pd_encoder_funcs = {
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.destroy = imx_drm_encoder_destroy,
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};
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static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
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.dpms = imx_pd_encoder_dpms,
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.mode_fixup = imx_pd_encoder_mode_fixup,
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.prepare = imx_pd_encoder_prepare,
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.commit = imx_pd_encoder_commit,
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.mode_set = imx_pd_encoder_mode_set,
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.disable = imx_pd_encoder_disable,
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};
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static int imx_pd_register(struct drm_device *drm,
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struct imx_parallel_display *imxpd)
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{
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int ret;
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ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
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imxpd->dev->of_node);
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if (ret)
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return ret;
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/* set the connector's dpms to OFF so that
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* drm_helper_connector_dpms() won't return
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* immediately since the current state is ON
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* at this point.
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*/
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imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
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drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
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drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
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DRM_MODE_ENCODER_NONE);
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drm_connector_helper_add(&imxpd->connector,
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&imx_pd_connector_helper_funcs);
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drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
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DRM_MODE_CONNECTOR_VGA);
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if (imxpd->panel)
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drm_panel_attach(imxpd->panel, &imxpd->connector);
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drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
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imxpd->connector.encoder = &imxpd->encoder;
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return 0;
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}
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static int imx_pd_bind(struct device *dev, struct device *master, void *data)
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{
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struct drm_device *drm = data;
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struct device_node *np = dev->of_node;
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struct device_node *panel_node;
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const u8 *edidp;
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struct imx_parallel_display *imxpd;
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int ret;
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const char *fmt;
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imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
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if (!imxpd)
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return -ENOMEM;
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edidp = of_get_property(np, "edid", &imxpd->edid_len);
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if (edidp)
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imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
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ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
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if (!ret) {
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if (!strcmp(fmt, "rgb24"))
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imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
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else if (!strcmp(fmt, "rgb565"))
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imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
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else if (!strcmp(fmt, "bgr666"))
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imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
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else if (!strcmp(fmt, "lvds666"))
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imxpd->interface_pix_fmt =
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v4l2_fourcc('L', 'V', 'D', '6');
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}
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panel_node = of_parse_phandle(np, "fsl,panel", 0);
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if (panel_node) {
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imxpd->panel = of_drm_find_panel(panel_node);
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if (!imxpd->panel)
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return -EPROBE_DEFER;
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}
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imxpd->dev = dev;
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ret = imx_pd_register(drm, imxpd);
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if (ret)
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return ret;
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dev_set_drvdata(dev, imxpd);
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return 0;
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}
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static void imx_pd_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
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imxpd->encoder.funcs->destroy(&imxpd->encoder);
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imxpd->connector.funcs->destroy(&imxpd->connector);
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kfree(imxpd->edid);
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}
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static const struct component_ops imx_pd_ops = {
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.bind = imx_pd_bind,
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.unbind = imx_pd_unbind,
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};
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static int imx_pd_probe(struct platform_device *pdev)
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{
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return component_add(&pdev->dev, &imx_pd_ops);
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}
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static int imx_pd_remove(struct platform_device *pdev)
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{
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component_del(&pdev->dev, &imx_pd_ops);
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return 0;
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}
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static const struct of_device_id imx_pd_dt_ids[] = {
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{ .compatible = "fsl,imx-parallel-display", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
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static struct platform_driver imx_pd_driver = {
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.probe = imx_pd_probe,
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.remove = imx_pd_remove,
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.driver = {
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.of_match_table = imx_pd_dt_ids,
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.name = "imx-parallel-display",
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},
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};
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module_platform_driver(imx_pd_driver);
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MODULE_DESCRIPTION("i.MX parallel display driver");
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MODULE_AUTHOR("Sascha Hauer, Pengutronix");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:imx-parallel-display");
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