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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
* Author: Rob Clark <rob@ti.com>
*/
#include <linux/list.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_edid.h>
#include "omap_drv.h"
/*
* encoder funcs
*/
#define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
/* The encoder and connector both map to same dssdev.. the encoder
* handles the 'active' parts, ie. anything the modifies the state
* of the hw, and the connector handles the 'read-only' parts, like
* detecting connection and reading edid.
*/
struct omap_encoder {
struct drm_encoder base;
struct omap_dss_device *output;
};
static void omap_encoder_destroy(struct drm_encoder *encoder)
{
struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
drm_encoder_cleanup(encoder);
kfree(omap_encoder);
}
static const struct drm_encoder_funcs omap_encoder_funcs = {
.destroy = omap_encoder_destroy,
};
static void omap_encoder_update_videomode_flags(struct videomode *vm,
u32 bus_flags)
{
if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW |
DISPLAY_FLAGS_DE_HIGH))) {
if (bus_flags & DRM_BUS_FLAG_DE_LOW)
vm->flags |= DISPLAY_FLAGS_DE_LOW;
else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
vm->flags |= DISPLAY_FLAGS_DE_HIGH;
}
if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {
if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
}
if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE |
DISPLAY_FLAGS_SYNC_NEGEDGE))) {
if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE)
vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE;
else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE)
vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;
}
}
static void omap_encoder_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
struct omap_dss_device *output = omap_encoder->output;
struct omap_dss_device *dssdev;
struct drm_device *dev = encoder->dev;
struct drm_connector *connector;
struct drm_bridge *bridge;
struct videomode vm = { 0 };
u32 bus_flags;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
if (connector->encoder == encoder)
break;
}
drm_display_mode_to_videomode(adjusted_mode, &vm);
/*
* HACK: This fixes the vm flags.
* struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and
* they get lost when converting back and forth between struct
* drm_display_mode and struct videomode. The hack below goes and
* fetches the missing flags.
*
* A better solution is to use DRM's bus-flags through the whole driver.
*/
for (dssdev = output; dssdev; dssdev = dssdev->next)
omap_encoder_update_videomode_flags(&vm, dssdev->bus_flags);
for (bridge = output->bridge; bridge;
bridge = drm_bridge_get_next_bridge(bridge)) {
if (!bridge->timings)
continue;
bus_flags = bridge->timings->input_bus_flags;
omap_encoder_update_videomode_flags(&vm, bus_flags);
}
bus_flags = connector->display_info.bus_flags;
omap_encoder_update_videomode_flags(&vm, bus_flags);
/* Set timings for the dss manager. */
dss_mgr_set_timings(output, &vm);
}
static void omap_encoder_disable(struct drm_encoder *encoder)
{
struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
struct omap_dss_device *dssdev = omap_encoder->output;
struct drm_device *dev = encoder->dev;
dev_dbg(dev->dev, "disable(%s)\n", dssdev->name);
/*
* Disable the chain of external devices, starting at the one at the
* internal encoder's output. This is used for DSI outputs only, as
* dssdev->next is NULL for all other outputs.
*/
omapdss_device_disable(dssdev->next);
}
static void omap_encoder_enable(struct drm_encoder *encoder)
{
struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
struct omap_dss_device *dssdev = omap_encoder->output;
struct drm_device *dev = encoder->dev;
dev_dbg(dev->dev, "enable(%s)\n", dssdev->name);
/*
* Enable the chain of external devices, starting at the one at the
* internal encoder's output. This is used for DSI outputs only, as
* dssdev->next is NULL for all other outputs.
*/
omapdss_device_enable(dssdev->next);
}
static int omap_encoder_atomic_check(struct drm_encoder *encoder,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
enum drm_mode_status status;
status = omap_connector_mode_fixup(omap_encoder->output,
&crtc_state->mode,
&crtc_state->adjusted_mode);
if (status != MODE_OK) {
dev_err(encoder->dev->dev, "invalid timings: %d\n", status);
return -EINVAL;
}
return 0;
}
static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
.mode_set = omap_encoder_mode_set,
.disable = omap_encoder_disable,
.enable = omap_encoder_enable,
.atomic_check = omap_encoder_atomic_check,
};
/* initialize encoder */
struct drm_encoder *omap_encoder_init(struct drm_device *dev,
struct omap_dss_device *output)
{
struct drm_encoder *encoder = NULL;
struct omap_encoder *omap_encoder;
omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
if (!omap_encoder)
goto fail;
omap_encoder->output = output;
encoder = &omap_encoder->base;
drm_encoder_init(dev, encoder, &omap_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
return encoder;
fail:
if (encoder)
omap_encoder_destroy(encoder);
return NULL;
}
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