hisilicon/hibmc/hibmc_drm_vdac.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* Hisilicon Hibmc SoC drm driver
0003  *
0004  * Based on the bochs drm driver.
0005  *
0006  * Copyright (c) 2016 Huawei Limited.
0007  *
0008  * Author:
0009  *  Rongrong Zou <zourongrong@huawei.com>
0010  *  Rongrong Zou <zourongrong@gmail.com>
0011  *  Jianhua Li <lijianhua@huawei.com>
0012  */
0013
0014 #include <drm/drm_atomic_helper.h>
0015 #include <drm/drm_probe_helper.h>
0016 #include <drm/drm_print.h>
0017 #include <drm/drm_simple_kms_helper.h>
0018
0019 #include "hibmc_drm_drv.h"
0020 #include "hibmc_drm_regs.h"
0021
0022 static int hibmc_connector_get_modes(struct drm_connector *connector)
0023 {
0024     int count;
0025     void *edid;
0026     struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
0027
0028     edid = drm_get_edid(connector, &hibmc_connector->adapter);
0029     if (edid) {
0030         drm_connector_update_edid_property(connector, edid);
0031         count = drm_add_edid_modes(connector, edid);
0032         if (count)
0033             goto out;
0034     }
0035
0036     count = drm_add_modes_noedid(connector,
0037                      connector->dev->mode_config.max_width,
0038                      connector->dev->mode_config.max_height);
0039     drm_set_preferred_mode(connector, 1024, 768);
0040
0041 out:
0042     kfree(edid);
0043     return count;
0044 }
0045
0046 static void hibmc_connector_destroy(struct drm_connector *connector)
0047 {
0048     struct hibmc_connector *hibmc_connector = to_hibmc_connector(connector);
0049
0050     i2c_del_adapter(&hibmc_connector->adapter);
0051     drm_connector_cleanup(connector);
0052 }
0053
0054 static const struct drm_connector_helper_funcs
0055     hibmc_connector_helper_funcs = {
0056     .get_modes = hibmc_connector_get_modes,
0057 };
0058
0059 static const struct drm_connector_funcs hibmc_connector_funcs = {
0060     .fill_modes = drm_helper_probe_single_connector_modes,
0061     .destroy = hibmc_connector_destroy,
0062     .reset = drm_atomic_helper_connector_reset,
0063     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0064     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0065 };
0066
0067 static void hibmc_encoder_mode_set(struct drm_encoder *encoder,
0068                    struct drm_display_mode *mode,
0069                    struct drm_display_mode *adj_mode)
0070 {
0071     u32 reg;
0072     struct drm_device *dev = encoder->dev;
0073     struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
0074
0075     reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
0076     reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1);
0077     reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1);
0078     reg |= HIBMC_DISPLAY_CONTROL_FPEN(1);
0079     reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1);
0080     writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE);
0081 }
0082
0083 static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = {
0084     .mode_set = hibmc_encoder_mode_set,
0085 };
0086
0087 int hibmc_vdac_init(struct hibmc_drm_private *priv)
0088 {
0089     struct drm_device *dev = &priv->dev;
0090     struct hibmc_connector *hibmc_connector = &priv->connector;
0091     struct drm_encoder *encoder = &priv->encoder;
0092     struct drm_crtc *crtc = &priv->crtc;
0093     struct drm_connector *connector = &hibmc_connector->base;
0094     int ret;
0095
0096     ret = hibmc_ddc_create(dev, hibmc_connector);
0097     if (ret) {
0098         drm_err(dev, "failed to create ddc: %d\n", ret);
0099         return ret;
0100     }
0101
0102     encoder->possible_crtcs = drm_crtc_mask(crtc);
0103     ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
0104     if (ret) {
0105         drm_err(dev, "failed to init encoder: %d\n", ret);
0106         return ret;
0107     }
0108
0109     drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs);
0110
0111     ret = drm_connector_init_with_ddc(dev, connector,
0112                       &hibmc_connector_funcs,
0113                       DRM_MODE_CONNECTOR_VGA,
0114                       &hibmc_connector->adapter);
0115     if (ret) {
0116         drm_err(dev, "failed to init connector: %d\n", ret);
0117         return ret;
0118     }
0119
0120     drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);
0121
0122     drm_connector_attach_encoder(connector, encoder);
0123
0124     return 0;
0125 }