147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
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* Author: Rob Clark <rob@ti.com>
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*/
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#include <linux/list.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_edid.h>
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#include "omap_drv.h"
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/*
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* encoder funcs
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*/
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#define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
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/* The encoder and connector both map to same dssdev.. the encoder
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* handles the 'active' parts, ie. anything the modifies the state
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* of the hw, and the connector handles the 'read-only' parts, like
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* detecting connection and reading edid.
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*/
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struct omap_encoder {
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struct drm_encoder base;
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struct omap_dss_device *output;
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};
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static void omap_encoder_destroy(struct drm_encoder *encoder)
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{
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struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
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drm_encoder_cleanup(encoder);
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kfree(omap_encoder);
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}
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static const struct drm_encoder_funcs omap_encoder_funcs = {
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.destroy = omap_encoder_destroy,
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};
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static void omap_encoder_update_videomode_flags(struct videomode *vm,
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u32 bus_flags)
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{
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if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW |
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DISPLAY_FLAGS_DE_HIGH))) {
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if (bus_flags & DRM_BUS_FLAG_DE_LOW)
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vm->flags |= DISPLAY_FLAGS_DE_LOW;
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else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
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vm->flags |= DISPLAY_FLAGS_DE_HIGH;
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}
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if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
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DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {
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if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
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vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
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else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
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vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
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}
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if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE |
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DISPLAY_FLAGS_SYNC_NEGEDGE))) {
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if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE)
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vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE;
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else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE)
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vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;
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}
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}
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static void omap_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
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struct omap_dss_device *output = omap_encoder->output;
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struct drm_device *dev = encoder->dev;
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struct drm_connector *connector;
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struct drm_bridge *bridge;
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struct videomode vm = { 0 };
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u32 bus_flags;
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list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
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if (connector->encoder == encoder)
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break;
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}
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drm_display_mode_to_videomode(adjusted_mode, &vm);
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/*
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* HACK: This fixes the vm flags.
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* struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and
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* they get lost when converting back and forth between struct
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* drm_display_mode and struct videomode. The hack below goes and
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* fetches the missing flags.
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*
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* A better solution is to use DRM's bus-flags through the whole driver.
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*/
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for (bridge = output->bridge; bridge;
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bridge = drm_bridge_get_next_bridge(bridge)) {
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if (!bridge->timings)
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continue;
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bus_flags = bridge->timings->input_bus_flags;
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omap_encoder_update_videomode_flags(&vm, bus_flags);
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}
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bus_flags = connector->display_info.bus_flags;
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omap_encoder_update_videomode_flags(&vm, bus_flags);
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/* Set timings for all devices in the display pipeline. */
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dss_mgr_set_timings(output, &vm);
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}
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static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
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.mode_set = omap_encoder_mode_set,
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};
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/* initialize encoder */
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struct drm_encoder *omap_encoder_init(struct drm_device *dev,
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struct omap_dss_device *output)
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{
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struct drm_encoder *encoder = NULL;
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struct omap_encoder *omap_encoder;
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omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
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if (!omap_encoder)
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goto fail;
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omap_encoder->output = output;
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encoder = &omap_encoder->base;
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drm_encoder_init(dev, encoder, &omap_encoder_funcs,
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DRM_MODE_ENCODER_TMDS, NULL);
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drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
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return encoder;
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fail:
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if (encoder)
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omap_encoder_destroy(encoder);
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return NULL;
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}
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