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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.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
new file mode 100644
index 0000000..daa5234
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -0,0 +1,185 @@
+/*
+ * 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 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_to_intel_dp(lspcon)->aux.ddc;
+
+ if (drm_lspcon_get_mode(adapter, &current_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_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_probe(struct intel_lspcon *lspcon)
+{
+ enum drm_dp_dual_mode_type adaptor_type;
+ struct i2c_adapter *adapter = &lspcon_to_intel_dp(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;
+}
+
+static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
+{
+ struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
+ unsigned long start = jiffies;
+
+ if (!lspcon->desc_valid)
+ return;
+
+ while (1) {
+ struct intel_dp_desc desc;
+
+ /*
+ * The w/a only applies in PCON mode and we don't expect any
+ * AUX errors.
+ */
+ if (!__intel_dp_read_desc(intel_dp, &desc))
+ return;
+
+ if (!memcmp(&intel_dp->desc, &desc, sizeof(desc))) {
+ 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)
+{
+ lspcon_resume_in_pcon_wa(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;
+
+ 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;
+ }
+ }
+
+ if (!intel_dp_read_dpcd(dp)) {
+ DRM_ERROR("LSPCON DPCD read failed\n");
+ return false;
+ }
+
+ lspcon->desc_valid = intel_dp_read_desc(dp);
+
+ DRM_DEBUG_KMS("Success: LSPCON init\n");
+ return true;
+}
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