diff options
Diffstat (limited to 'drivers/gpu/drm/imx/parallel-display.c')
| -rw-r--r-- | drivers/gpu/drm/imx/parallel-display.c | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c new file mode 100644 index 000000000..06723b2e9 --- /dev/null +++ b/drivers/gpu/drm/imx/parallel-display.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * i.MX drm driver - parallel display implementation + * + * Copyright (C) 2012 Sascha Hauer, Pengutronix + */ + +#include <linux/component.h> +#include <linux/media-bus-format.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/videodev2.h> + +#include <video/of_display_timing.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_edid.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_managed.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> + +#include "imx-drm.h" + +struct imx_parallel_display_encoder { + struct drm_connector connector; + struct drm_encoder encoder; + struct drm_bridge bridge; + struct imx_parallel_display *pd; +}; + +struct imx_parallel_display { + struct device *dev; + void *edid; + u32 bus_format; + u32 bus_flags; + struct drm_display_mode mode; + struct drm_panel *panel; + struct drm_bridge *next_bridge; +}; + +static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c) +{ + return container_of(c, struct imx_parallel_display_encoder, connector)->pd; +} + +static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b) +{ + return container_of(b, struct imx_parallel_display_encoder, bridge)->pd; +} + +static int imx_pd_connector_get_modes(struct drm_connector *connector) +{ + struct imx_parallel_display *imxpd = con_to_imxpd(connector); + struct device_node *np = imxpd->dev->of_node; + int num_modes; + + num_modes = drm_panel_get_modes(imxpd->panel, connector); + if (num_modes > 0) + return num_modes; + + if (imxpd->edid) { + drm_connector_update_edid_property(connector, imxpd->edid); + num_modes = drm_add_edid_modes(connector, imxpd->edid); + } + + if (np) { + struct drm_display_mode *mode = drm_mode_create(connector->dev); + int ret; + + if (!mode) + return -EINVAL; + + ret = of_get_drm_display_mode(np, &imxpd->mode, + &imxpd->bus_flags, + OF_USE_NATIVE_MODE); + if (ret) { + drm_mode_destroy(connector->dev, mode); + return ret; + } + + 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 void imx_pd_bridge_enable(struct drm_bridge *bridge) +{ + struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); + + drm_panel_prepare(imxpd->panel); + drm_panel_enable(imxpd->panel); +} + +static void imx_pd_bridge_disable(struct drm_bridge *bridge) +{ + struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); + + drm_panel_disable(imxpd->panel); + drm_panel_unprepare(imxpd->panel); +} + +static const u32 imx_pd_bus_fmts[] = { + MEDIA_BUS_FMT_RGB888_1X24, + MEDIA_BUS_FMT_BGR888_1X24, + MEDIA_BUS_FMT_GBR888_1X24, + MEDIA_BUS_FMT_RGB666_1X18, + MEDIA_BUS_FMT_RGB666_1X24_CPADHI, + MEDIA_BUS_FMT_RGB565_1X16, +}; + +static u32 * +imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + unsigned int *num_output_fmts) +{ + struct drm_display_info *di = &conn_state->connector->display_info; + struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); + u32 *output_fmts; + + if (!imxpd->bus_format && !di->num_bus_formats) { + *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts); + return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts), + GFP_KERNEL); + } + + *num_output_fmts = 1; + output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL); + if (!output_fmts) + return NULL; + + if (!imxpd->bus_format && di->num_bus_formats) + output_fmts[0] = di->bus_formats[0]; + else + output_fmts[0] = imxpd->bus_format; + + return output_fmts; +} + +static bool imx_pd_format_supported(u32 output_fmt) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) { + if (imx_pd_bus_fmts[i] == output_fmt) + return true; + } + + return false; +} + +static u32 * +imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + u32 output_fmt, + unsigned int *num_input_fmts) +{ + struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); + u32 *input_fmts; + + /* + * If the next bridge does not support bus format negotiation, let's + * use the static bus format definition (imxpd->bus_format) if it's + * specified, RGB888 when it's not. + */ + if (output_fmt == MEDIA_BUS_FMT_FIXED) + output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24; + + /* Now make sure the requested output format is supported. */ + if ((imxpd->bus_format && imxpd->bus_format != output_fmt) || + !imx_pd_format_supported(output_fmt)) { + *num_input_fmts = 0; + return NULL; + } + + *num_input_fmts = 1; + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); + if (!input_fmts) + return NULL; + + input_fmts[0] = output_fmt; + return input_fmts; +} + +static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state); + struct drm_display_info *di = &conn_state->connector->display_info; + struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); + struct drm_bridge_state *next_bridge_state = NULL; + struct drm_bridge *next_bridge; + u32 bus_flags, bus_fmt; + + next_bridge = drm_bridge_get_next_bridge(bridge); + if (next_bridge) + next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state, + next_bridge); + + if (next_bridge_state) + bus_flags = next_bridge_state->input_bus_cfg.flags; + else if (di->num_bus_formats) + bus_flags = di->bus_flags; + else + bus_flags = imxpd->bus_flags; + + bus_fmt = bridge_state->input_bus_cfg.format; + if (!imx_pd_format_supported(bus_fmt)) + return -EINVAL; + + bridge_state->output_bus_cfg.flags = bus_flags; + bridge_state->input_bus_cfg.flags = bus_flags; + imx_crtc_state->bus_flags = bus_flags; + imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format; + imx_crtc_state->di_hsync_pin = 2; + imx_crtc_state->di_vsync_pin = 3; + + return 0; +} + +static const struct drm_connector_funcs imx_pd_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = imx_drm_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 const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = { + .get_modes = imx_pd_connector_get_modes, +}; + +static const struct drm_bridge_funcs imx_pd_bridge_funcs = { + .enable = imx_pd_bridge_enable, + .disable = imx_pd_bridge_disable, + .atomic_reset = drm_atomic_helper_bridge_reset, + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_check = imx_pd_bridge_atomic_check, + .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts, + .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts, +}; + +static int imx_pd_bind(struct device *dev, struct device *master, void *data) +{ + struct drm_device *drm = data; + struct imx_parallel_display *imxpd = dev_get_drvdata(dev); + struct imx_parallel_display_encoder *imxpd_encoder; + struct drm_connector *connector; + struct drm_encoder *encoder; + struct drm_bridge *bridge; + int ret; + + imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder, + encoder, DRM_MODE_ENCODER_NONE); + if (IS_ERR(imxpd_encoder)) + return PTR_ERR(imxpd_encoder); + + imxpd_encoder->pd = imxpd; + connector = &imxpd_encoder->connector; + encoder = &imxpd_encoder->encoder; + bridge = &imxpd_encoder->bridge; + + ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node); + if (ret) + return ret; + + /* set the connector's dpms to OFF so that + * drm_helper_connector_dpms() won't return + * immediately since the current state is ON + * at this point. + */ + connector->dpms = DRM_MODE_DPMS_OFF; + + bridge->funcs = &imx_pd_bridge_funcs; + drm_bridge_attach(encoder, bridge, NULL, 0); + + if (imxpd->next_bridge) { + ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0); + if (ret < 0) + return ret; + } else { + drm_connector_helper_add(connector, + &imx_pd_connector_helper_funcs); + drm_connector_init(drm, connector, &imx_pd_connector_funcs, + DRM_MODE_CONNECTOR_DPI); + + drm_connector_attach_encoder(connector, encoder); + } + + return 0; +} + +static const struct component_ops imx_pd_ops = { + .bind = imx_pd_bind, +}; + +static int imx_pd_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + const u8 *edidp; + struct imx_parallel_display *imxpd; + int edid_len; + int ret; + u32 bus_format = 0; + const char *fmt; + + imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL); + if (!imxpd) + return -ENOMEM; + + /* port@1 is the output port */ + ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, + &imxpd->next_bridge); + if (ret && ret != -ENODEV) + return ret; + + edidp = of_get_property(np, "edid", &edid_len); + if (edidp) + imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL); + + ret = of_property_read_string(np, "interface-pix-fmt", &fmt); + if (!ret) { + if (!strcmp(fmt, "rgb24")) + bus_format = MEDIA_BUS_FMT_RGB888_1X24; + else if (!strcmp(fmt, "rgb565")) + bus_format = MEDIA_BUS_FMT_RGB565_1X16; + else if (!strcmp(fmt, "bgr666")) + bus_format = MEDIA_BUS_FMT_RGB666_1X18; + else if (!strcmp(fmt, "lvds666")) + bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI; + } + imxpd->bus_format = bus_format; + + imxpd->dev = dev; + + platform_set_drvdata(pdev, imxpd); + + return component_add(dev, &imx_pd_ops); +} + +static int imx_pd_remove(struct platform_device *pdev) +{ + component_del(&pdev->dev, &imx_pd_ops); + + return 0; +} + +static const struct of_device_id imx_pd_dt_ids[] = { + { .compatible = "fsl,imx-parallel-display", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx_pd_dt_ids); + +static struct platform_driver imx_pd_driver = { + .probe = imx_pd_probe, + .remove = imx_pd_remove, + .driver = { + .of_match_table = imx_pd_dt_ids, + .name = "imx-parallel-display", + }, +}; + +module_platform_driver(imx_pd_driver); + +MODULE_DESCRIPTION("i.MX parallel display driver"); +MODULE_AUTHOR("Sascha Hauer, Pengutronix"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:imx-parallel-display"); |