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path: root/drivers/gpu/drm/i915/intel_lspcon.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_lspcon.c')
-rw-r--r--drivers/gpu/drm/i915/intel_lspcon.c247
1 files changed, 0 insertions, 247 deletions
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
deleted file mode 100644
index 5abef482eacf..000000000000
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ /dev/null
@@ -1,247 +0,0 @@
-/*
- * 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 struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
-{
- struct intel_digital_port *dig_port =
- container_of(lspcon, struct intel_digital_port, lspcon);
-
- return &dig_port->dp;
-}
-
-static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
-{
- switch (mode) {
- case DRM_LSPCON_MODE_PCON:
- return "PCON";
- case DRM_LSPCON_MODE_LS:
- return "LS";
- case DRM_LSPCON_MODE_INVALID:
- return "INVALID";
- default:
- MISSING_CASE(mode);
- return "INVALID";
- }
-}
-
-static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
-{
- enum drm_lspcon_mode current_mode;
- struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
-
- if (drm_lspcon_get_mode(adapter, &current_mode)) {
- DRM_ERROR("Error reading LSPCON mode\n");
- return DRM_LSPCON_MODE_INVALID;
- }
- return current_mode;
-}
-
-static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
- enum drm_lspcon_mode mode)
-{
- enum drm_lspcon_mode current_mode;
-
- current_mode = lspcon_get_current_mode(lspcon);
- if (current_mode == mode || current_mode == DRM_LSPCON_MODE_INVALID)
- goto out;
-
- DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
- lspcon_mode_name(mode));
-
- wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode ||
- current_mode == DRM_LSPCON_MODE_INVALID, 100);
- if (current_mode != mode)
- DRM_DEBUG_KMS("LSPCON mode hasn't settled\n");
-
-out:
- DRM_DEBUG_KMS("Current LSPCON mode %s\n",
- lspcon_mode_name(current_mode));
-
- return current_mode;
-}
-
-static int lspcon_change_mode(struct intel_lspcon *lspcon,
- enum drm_lspcon_mode mode)
-{
- int err;
- enum drm_lspcon_mode current_mode;
- struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
-
- err = drm_lspcon_get_mode(adapter, &current_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_wake_native_aux_ch(struct intel_lspcon *lspcon)
-{
- uint8_t rev;
-
- if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
- &rev) != 1) {
- DRM_DEBUG_KMS("Native AUX CH down\n");
- return false;
- }
-
- DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
- rev >> 4, rev & 0xf);
-
- return true;
-}
-
-static bool lspcon_probe(struct intel_lspcon *lspcon)
-{
- enum drm_dp_dual_mode_type adaptor_type;
- struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
- enum drm_lspcon_mode expected_mode;
-
- expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
- DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
-
- /* 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_wait_mode(lspcon, expected_mode);
- lspcon->active = true;
- return true;
-}
-
-static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
-{
- struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
- struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
- struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
- unsigned long start = jiffies;
-
- while (1) {
- if (intel_digital_port_connected(dev_priv, dig_port)) {
- DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
- jiffies_to_msecs(jiffies - start));
- return;
- }
-
- if (time_after(jiffies, start + msecs_to_jiffies(1000)))
- break;
-
- usleep_range(10000, 15000);
- }
-
- DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
-}
-
-void lspcon_resume(struct intel_lspcon *lspcon)
-{
- enum drm_lspcon_mode expected_mode;
-
- if (lspcon_wake_native_aux_ch(lspcon)) {
- expected_mode = DRM_LSPCON_MODE_PCON;
- lspcon_resume_in_pcon_wa(lspcon);
- } else {
- expected_mode = DRM_LSPCON_MODE_LS;
- }
-
- if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
- return;
-
- if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
- DRM_ERROR("LSPCON resume failed\n");
- else
- DRM_DEBUG_KMS("LSPCON resume success\n");
-}
-
-void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
-{
- lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
-}
-
-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;
-
- 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) < 0) {
- DRM_ERROR("LSPCON mode change to PCON failed\n");
- return false;
- }
- }
-
- if (!intel_dp_read_dpcd(dp)) {
- DRM_ERROR("LSPCON DPCD read failed\n");
- return false;
- }
-
- drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
-
- DRM_DEBUG_KMS("Success: LSPCON init\n");
- return true;
-}
generated by cgit (git 2.34.1) at 2025-12-25 02:31:59 +0000