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/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*
*/
#include <drm/drm_edid.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_dual_mode_helper.h>
#include "intel_drv.h"
static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
{
enum drm_lspcon_mode current_mode = DRM_LSPCON_MODE_INVALID;
struct i2c_adapter *adapter = &lspcon->aux->ddc;
if (drm_lspcon_get_mode(adapter, ¤t_mode))
DRM_ERROR("Error reading LSPCON mode\n");
else
DRM_DEBUG_KMS("Current LSPCON mode %s\n",
current_mode == DRM_LSPCON_MODE_PCON ? "PCON" : "LS");
return current_mode;
}
static int lspcon_change_mode(struct intel_lspcon *lspcon,
enum drm_lspcon_mode mode, bool force)
{
int err;
enum drm_lspcon_mode current_mode;
struct i2c_adapter *adapter = &lspcon->aux->ddc;
err = drm_lspcon_get_mode(adapter, ¤t_mode);
if (err) {
DRM_ERROR("Error reading LSPCON mode\n");
return err;
}
if (current_mode == mode) {
DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
return 0;
}
err = drm_lspcon_set_mode(adapter, mode);
if (err < 0) {
DRM_ERROR("LSPCON mode change failed\n");
return err;
}
lspcon->mode = mode;
DRM_DEBUG_KMS("LSPCON mode changed done\n");
return 0;
}
static bool lspcon_probe(struct intel_lspcon *lspcon)
{
enum drm_dp_dual_mode_type adaptor_type;
struct i2c_adapter *adapter = &lspcon->aux->ddc;
/* Lets probe the adaptor and check its type */
adaptor_type = drm_dp_dual_mode_detect(adapter);
if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
drm_dp_get_dual_mode_type_name(adaptor_type));
return false;
}
/* Yay ... got a LSPCON device */
DRM_DEBUG_KMS("LSPCON detected\n");
lspcon->mode = lspcon_get_current_mode(lspcon);
lspcon->active = true;
return true;
}
void lspcon_resume(struct intel_lspcon *lspcon)
{
if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON, true))
DRM_ERROR("LSPCON resume failed\n");
else
DRM_DEBUG_KMS("LSPCON resume success\n");
}
bool lspcon_init(struct intel_digital_port *intel_dig_port)
{
struct intel_dp *dp = &intel_dig_port->dp;
struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
if (!IS_GEN9(dev_priv)) {
DRM_ERROR("LSPCON is supported on GEN9 only\n");
return false;
}
lspcon->active = false;
lspcon->mode = DRM_LSPCON_MODE_INVALID;
lspcon->aux = &dp->aux;
if (!lspcon_probe(lspcon)) {
DRM_ERROR("Failed to probe lspcon\n");
return false;
}
/*
* In the SW state machine, lets Put LSPCON in PCON mode only.
* In this way, it will work with both HDMI 1.4 sinks as well as HDMI
* 2.0 sinks.
*/
if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) {
if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON,
true) < 0) {
DRM_ERROR("LSPCON mode change to PCON failed\n");
return false;
}
}
DRM_DEBUG_KMS("Success: LSPCON init\n");
return true;
}
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