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387 lines
10 KiB
387 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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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#include <linux/component.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/videodev2.h> |
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#include <video/of_display_timing.h> |
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#include <drm/drm_atomic_helper.h> |
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#include <drm/drm_bridge.h> |
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#include <drm/drm_fb_helper.h> |
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#include <drm/drm_managed.h> |
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#include <drm/drm_of.h> |
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#include <drm/drm_panel.h> |
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#include <drm/drm_probe_helper.h> |
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#include <drm/drm_simple_kms_helper.h> |
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#include "imx-drm.h" |
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struct imx_parallel_display_encoder { |
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struct drm_connector connector; |
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struct drm_encoder encoder; |
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struct drm_bridge bridge; |
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struct imx_parallel_display *pd; |
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}; |
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struct imx_parallel_display { |
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struct device *dev; |
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void *edid; |
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u32 bus_format; |
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u32 bus_flags; |
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struct drm_display_mode mode; |
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struct drm_panel *panel; |
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struct drm_bridge *next_bridge; |
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}; |
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static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c) |
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{ |
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return container_of(c, struct imx_parallel_display_encoder, connector)->pd; |
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} |
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static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b) |
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{ |
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return container_of(b, struct imx_parallel_display_encoder, bridge)->pd; |
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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; |
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num_modes = drm_panel_get_modes(imxpd->panel, connector); |
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if (num_modes > 0) |
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return num_modes; |
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if (imxpd->edid) { |
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drm_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 (np) { |
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struct drm_display_mode *mode = drm_mode_create(connector->dev); |
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int ret; |
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if (!mode) |
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return -EINVAL; |
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ret = of_get_drm_display_mode(np, &imxpd->mode, |
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&imxpd->bus_flags, |
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OF_USE_NATIVE_MODE); |
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if (ret) |
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return ret; |
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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 void imx_pd_bridge_enable(struct drm_bridge *bridge) |
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{ |
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); |
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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_bridge_disable(struct drm_bridge *bridge) |
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{ |
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); |
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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 const u32 imx_pd_bus_fmts[] = { |
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MEDIA_BUS_FMT_RGB888_1X24, |
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MEDIA_BUS_FMT_BGR888_1X24, |
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MEDIA_BUS_FMT_GBR888_1X24, |
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MEDIA_BUS_FMT_RGB666_1X18, |
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MEDIA_BUS_FMT_RGB666_1X24_CPADHI, |
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MEDIA_BUS_FMT_RGB565_1X16, |
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}; |
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static u32 * |
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imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, |
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struct drm_bridge_state *bridge_state, |
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struct drm_crtc_state *crtc_state, |
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struct drm_connector_state *conn_state, |
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unsigned int *num_output_fmts) |
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{ |
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struct drm_display_info *di = &conn_state->connector->display_info; |
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); |
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u32 *output_fmts; |
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if (!imxpd->bus_format && !di->num_bus_formats) { |
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*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts); |
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return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts), |
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GFP_KERNEL); |
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} |
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*num_output_fmts = 1; |
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output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL); |
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if (!output_fmts) |
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return NULL; |
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if (!imxpd->bus_format && di->num_bus_formats) |
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output_fmts[0] = di->bus_formats[0]; |
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else |
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output_fmts[0] = imxpd->bus_format; |
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return output_fmts; |
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} |
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static bool imx_pd_format_supported(u32 output_fmt) |
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{ |
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unsigned int i; |
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for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) { |
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if (imx_pd_bus_fmts[i] == output_fmt) |
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return true; |
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} |
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return false; |
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} |
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static u32 * |
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imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, |
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struct drm_bridge_state *bridge_state, |
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struct drm_crtc_state *crtc_state, |
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struct drm_connector_state *conn_state, |
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u32 output_fmt, |
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unsigned int *num_input_fmts) |
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{ |
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); |
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u32 *input_fmts; |
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/* |
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* If the next bridge does not support bus format negotiation, let's |
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* use the static bus format definition (imxpd->bus_format) if it's |
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* specified, RGB888 when it's not. |
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*/ |
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if (output_fmt == MEDIA_BUS_FMT_FIXED) |
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output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24; |
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/* Now make sure the requested output format is supported. */ |
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if ((imxpd->bus_format && imxpd->bus_format != output_fmt) || |
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!imx_pd_format_supported(output_fmt)) { |
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*num_input_fmts = 0; |
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return NULL; |
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} |
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*num_input_fmts = 1; |
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input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); |
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if (!input_fmts) |
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return NULL; |
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input_fmts[0] = output_fmt; |
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return input_fmts; |
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} |
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static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge, |
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struct drm_bridge_state *bridge_state, |
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struct drm_crtc_state *crtc_state, |
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struct drm_connector_state *conn_state) |
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{ |
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struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state); |
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struct drm_display_info *di = &conn_state->connector->display_info; |
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struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge); |
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struct drm_bridge_state *next_bridge_state = NULL; |
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struct drm_bridge *next_bridge; |
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u32 bus_flags, bus_fmt; |
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next_bridge = drm_bridge_get_next_bridge(bridge); |
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if (next_bridge) |
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next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state, |
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next_bridge); |
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if (next_bridge_state) |
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bus_flags = next_bridge_state->input_bus_cfg.flags; |
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else if (di->num_bus_formats) |
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bus_flags = di->bus_flags; |
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else |
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bus_flags = imxpd->bus_flags; |
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bus_fmt = bridge_state->input_bus_cfg.format; |
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if (!imx_pd_format_supported(bus_fmt)) |
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return -EINVAL; |
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if (bus_flags & |
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~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH | |
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DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE | |
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DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) { |
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dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags); |
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return -EINVAL; |
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} |
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bridge_state->output_bus_cfg.flags = bus_flags; |
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bridge_state->input_bus_cfg.flags = bus_flags; |
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imx_crtc_state->bus_flags = bus_flags; |
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imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format; |
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imx_crtc_state->di_hsync_pin = 2; |
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imx_crtc_state->di_vsync_pin = 3; |
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return 0; |
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} |
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static const struct drm_connector_funcs imx_pd_connector_funcs = { |
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.fill_modes = drm_helper_probe_single_connector_modes, |
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.destroy = imx_drm_connector_destroy, |
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.reset = drm_atomic_helper_connector_reset, |
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
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}; |
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static const 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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}; |
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static const struct drm_bridge_funcs imx_pd_bridge_funcs = { |
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.enable = imx_pd_bridge_enable, |
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.disable = imx_pd_bridge_disable, |
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.atomic_reset = drm_atomic_helper_bridge_reset, |
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.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, |
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.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, |
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.atomic_check = imx_pd_bridge_atomic_check, |
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.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts, |
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.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts, |
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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 imx_parallel_display *imxpd = dev_get_drvdata(dev); |
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struct imx_parallel_display_encoder *imxpd_encoder; |
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struct drm_connector *connector; |
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struct drm_encoder *encoder; |
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struct drm_bridge *bridge; |
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int ret; |
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imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder, |
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encoder, DRM_MODE_ENCODER_NONE); |
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if (IS_ERR(imxpd_encoder)) |
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return PTR_ERR(imxpd_encoder); |
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imxpd_encoder->pd = imxpd; |
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connector = &imxpd_encoder->connector; |
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encoder = &imxpd_encoder->encoder; |
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bridge = &imxpd_encoder->bridge; |
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ret = imx_drm_encoder_parse_of(drm, encoder, 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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connector->dpms = DRM_MODE_DPMS_OFF; |
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bridge->funcs = &imx_pd_bridge_funcs; |
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drm_bridge_attach(encoder, bridge, NULL, 0); |
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if (imxpd->next_bridge) { |
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ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0); |
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if (ret < 0) |
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return ret; |
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} else { |
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drm_connector_helper_add(connector, |
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&imx_pd_connector_helper_funcs); |
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drm_connector_init(drm, connector, &imx_pd_connector_funcs, |
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DRM_MODE_CONNECTOR_DPI); |
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drm_connector_attach_encoder(connector, encoder); |
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} |
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return 0; |
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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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}; |
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static int imx_pd_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *np = dev->of_node; |
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const u8 *edidp; |
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struct imx_parallel_display *imxpd; |
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int edid_len; |
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int ret; |
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u32 bus_format = 0; |
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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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/* port@1 is the output port */ |
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ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, |
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&imxpd->next_bridge); |
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if (ret && ret != -ENODEV) |
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return ret; |
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edidp = of_get_property(np, "edid", &edid_len); |
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if (edidp) |
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imxpd->edid = devm_kmemdup(dev, edidp, 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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bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
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else if (!strcmp(fmt, "rgb565")) |
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bus_format = MEDIA_BUS_FMT_RGB565_1X16; |
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else if (!strcmp(fmt, "bgr666")) |
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bus_format = MEDIA_BUS_FMT_RGB666_1X18; |
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else if (!strcmp(fmt, "lvds666")) |
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bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI; |
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} |
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imxpd->bus_format = bus_format; |
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imxpd->dev = dev; |
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platform_set_drvdata(pdev, imxpd); |
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return component_add(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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