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![Jani Nikula](/assets/img/avatar_default.png)
Switch to using the common DP helpers instead of using our own. v2: also remove leftover struct intel_dp_desc (Daniel) Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
247 lines
6.7 KiB
C
247 lines
6.7 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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static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
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{
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struct intel_digital_port *dig_port =
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container_of(lspcon, struct intel_digital_port, lspcon);
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return &dig_port->dp;
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}
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static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
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{
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switch (mode) {
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case DRM_LSPCON_MODE_PCON:
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return "PCON";
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case DRM_LSPCON_MODE_LS:
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return "LS";
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case DRM_LSPCON_MODE_INVALID:
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return "INVALID";
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default:
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MISSING_CASE(mode);
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return "INVALID";
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}
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}
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static 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;
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struct i2c_adapter *adapter = &lspcon_to_intel_dp(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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return DRM_LSPCON_MODE_INVALID;
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}
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return current_mode;
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}
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static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
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enum drm_lspcon_mode mode)
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{
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enum drm_lspcon_mode current_mode;
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current_mode = lspcon_get_current_mode(lspcon);
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if (current_mode == mode || current_mode == DRM_LSPCON_MODE_INVALID)
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goto out;
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DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
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lspcon_mode_name(mode));
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wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode ||
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current_mode == DRM_LSPCON_MODE_INVALID, 100);
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if (current_mode != mode)
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DRM_DEBUG_KMS("LSPCON mode hasn't settled\n");
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out:
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DRM_DEBUG_KMS("Current LSPCON mode %s\n",
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lspcon_mode_name(current_mode));
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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)
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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_to_intel_dp(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_wake_native_aux_ch(struct intel_lspcon *lspcon)
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{
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uint8_t rev;
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if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
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&rev) != 1) {
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DRM_DEBUG_KMS("Native AUX CH down\n");
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return false;
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}
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DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
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rev >> 4, rev & 0xf);
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return true;
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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_to_intel_dp(lspcon)->aux.ddc;
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enum drm_lspcon_mode expected_mode;
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expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
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DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
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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_wait_mode(lspcon, expected_mode);
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lspcon->active = true;
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return true;
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}
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static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
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{
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struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
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struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
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struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
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unsigned long start = jiffies;
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while (1) {
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if (intel_digital_port_connected(dev_priv, dig_port)) {
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DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
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jiffies_to_msecs(jiffies - start));
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return;
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}
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if (time_after(jiffies, start + msecs_to_jiffies(1000)))
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break;
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usleep_range(10000, 15000);
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}
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DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
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}
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void lspcon_resume(struct intel_lspcon *lspcon)
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{
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enum drm_lspcon_mode expected_mode;
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if (lspcon_wake_native_aux_ch(lspcon)) {
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expected_mode = DRM_LSPCON_MODE_PCON;
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lspcon_resume_in_pcon_wa(lspcon);
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} else {
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expected_mode = DRM_LSPCON_MODE_LS;
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}
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if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
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return;
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if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
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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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void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
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{
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lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
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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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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) < 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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if (!intel_dp_read_dpcd(dp)) {
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DRM_ERROR("LSPCON DPCD read failed\n");
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return false;
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}
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drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
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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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