diff options
Diffstat (limited to 'drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c')
| -rw-r--r-- | drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c new file mode 100644 index 000000000000..841e81f47b68 --- /dev/null +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Hisilicon Hibmc SoC drm driver + * + * Based on the bochs drm driver. + * + * Copyright (c) 2016 Huawei Limited. + * + * Author: + * Rongrong Zou <zourongrong@huawei.com> + * Rongrong Zou <zourongrong@gmail.com> + * Jianhua Li <lijianhua@huawei.com> + */ + +#include <linux/io.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_edid.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_print.h> +#include <drm/drm_simple_kms_helper.h> + +#include "hibmc_drm_drv.h" +#include "hibmc_drm_regs.h" + +static int hibmc_connector_get_modes(struct drm_connector *connector) +{ + struct hibmc_vdac *vdac = to_hibmc_vdac(connector); + const struct drm_edid *drm_edid; + int count; + + drm_edid = drm_edid_read_ddc(connector, &vdac->adapter); + + drm_edid_connector_update(connector, drm_edid); + + if (drm_edid) { + count = drm_edid_connector_add_modes(connector); + if (count) + goto out; + } + + count = drm_add_modes_noedid(connector, + connector->dev->mode_config.max_width, + connector->dev->mode_config.max_height); + drm_set_preferred_mode(connector, 1024, 768); + +out: + drm_edid_free(drm_edid); + + return count; +} + +static void hibmc_connector_destroy(struct drm_connector *connector) +{ + struct hibmc_vdac *vdac = to_hibmc_vdac(connector); + + hibmc_ddc_del(vdac); + drm_connector_cleanup(connector); +} + +static const struct drm_connector_helper_funcs + hibmc_connector_helper_funcs = { + .get_modes = hibmc_connector_get_modes, + .detect_ctx = drm_connector_helper_detect_from_ddc, +}; + +static const struct drm_connector_funcs hibmc_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = hibmc_connector_destroy, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static void hibmc_encoder_mode_set(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adj_mode) +{ + u32 reg; + struct drm_device *dev = encoder->dev; + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); + + reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE); + reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1); + reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1); + reg |= HIBMC_DISPLAY_CONTROL_FPEN(1); + reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1); + writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE); +} + +static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = { + .mode_set = hibmc_encoder_mode_set, +}; + +int hibmc_vdac_init(struct hibmc_drm_private *priv) +{ + struct drm_device *dev = &priv->dev; + struct hibmc_vdac *vdac = &priv->vdac; + struct drm_encoder *encoder = &vdac->encoder; + struct drm_crtc *crtc = &priv->crtc; + struct drm_connector *connector = &vdac->connector; + int ret; + + ret = hibmc_ddc_create(dev, vdac); + if (ret) { + drm_err(dev, "failed to create ddc: %d\n", ret); + return ret; + } + + encoder->possible_crtcs = drm_crtc_mask(crtc); + ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_DAC, NULL); + if (ret) { + drm_err(dev, "failed to init encoder: %d\n", ret); + goto err; + } + + drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs); + + ret = drm_connector_init_with_ddc(dev, connector, + &hibmc_connector_funcs, + DRM_MODE_CONNECTOR_VGA, + &vdac->adapter); + if (ret) { + drm_err(dev, "failed to init connector: %d\n", ret); + goto err; + } + + drm_connector_helper_add(connector, &hibmc_connector_helper_funcs); + + drm_connector_attach_encoder(connector, encoder); + + connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; + + return 0; + +err: + hibmc_ddc_del(vdac); + + return ret; +} |