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910530c063
As per the software design, we are driving lspcon in PCON mode. But while resuming from suspend, lspcon can go in LS mode (which is its default operating mode on power on) This patch adds a resume function for lspcon, which makes sure its operating in PCON mode, post resume. V2: Address review comments from Imre - move lspcon_resume call to encoder->reset() - use early returns Signed-off-by: Shashank Sharma <shashank.sharma@intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1476455212-27893-6-git-send-email-shashank.sharma@intel.com
136 lines
4 KiB
C
136 lines
4 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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void lspcon_resume(struct intel_lspcon *lspcon)
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{
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if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON, true))
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DRM_ERROR("LSPCON resume failed\n");
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else
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DRM_DEBUG_KMS("LSPCON resume success\n");
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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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