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