summarylogtreecommitdiffstats
path: root/0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch
diff options
context:
space:
mode:
Diffstat (limited to '0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch')
-rw-r--r--0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch107
1 files changed, 0 insertions, 107 deletions
diff --git a/0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch b/0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch
deleted file mode 100644
index e8d116c2526..00000000000
--- a/0003-drm-i915-ilk-glk-Fix-link-training-on-links-with-LTT.patch
+++ /dev/null
@@ -1,107 +0,0 @@
-From 1b5f96a934af463ddb037b78871afe8a3524e665 Mon Sep 17 00:00:00 2001
-From: Imre Deak <imre.deak@intel.com>
-Date: Wed, 17 Mar 2021 20:48:59 +0200
-Subject: [PATCH 3/6] drm/i915/ilk-glk: Fix link training on links with LTTPRs
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Cherry-picked from intel-drm-next 984982f3ef7b240cd24c2feb2762d81d9d8da3c2
-
-The spec requires to use at least 3.2ms for the AUX timeout period if
-there are LT-tunable PHY Repeaters on the link (2.11.2). An upcoming
-spec update makes this more specific, by requiring a 3.2ms minimum
-timeout period for the LTTPR detection reading the 0xF0000-0xF0007
-range (3.6.5.1).
-
-Accordingly disable LTTPR detection until GLK, where the maximum timeout
-we can set is only 1.6ms.
-
-Link training in the non-transparent mode is known to fail at least on
-some SKL systems with a WD19 dock on the link, which exposes an LTTPR
-(see the References below). While this could have different reasons
-besides the too short AUX timeout used, not detecting LTTPRs (and so not
-using the non-transparent LT mode) fixes link training on these systems.
-
-While at it add a code comment about the platform specific maximum
-timeout values.
-
-v2: Add a comment about the g4x maximum timeout as well. (Ville)
-
-Reported-by: Takashi Iwai <tiwai@suse.de>
-Reported-and-tested-by: Santiago Zarate <santiago.zarate@suse.com>
-Reported-and-tested-by: Bodo Graumann <mail@bodograumann.de>
-References: https://gitlab.freedesktop.org/drm/intel/-/issues/3166
-Fixes: b30edfd8d0b4 ("drm/i915: Switch to LTTPR non-transparent mode link training")
-Cc: <stable@vger.kernel.org> # v5.11
-Cc: Takashi Iwai <tiwai@suse.de>
-Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
-Signed-off-by: Imre Deak <imre.deak@intel.com>
-Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
-Link: https://patchwork.freedesktop.org/patch/msgid/20210317184901.4029798-2-imre.deak@intel.com
----
- drivers/gpu/drm/i915/display/intel_dp.c | 7 +++++++
- .../gpu/drm/i915/display/intel_dp_link_training.c | 15 ++++++++++++---
- 2 files changed, 19 insertions(+), 3 deletions(-)
-
-diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
-index 8a26307c4896..1930df9a8bcc 100644
---- a/drivers/gpu/drm/i915/display/intel_dp.c
-+++ b/drivers/gpu/drm/i915/display/intel_dp.c
-@@ -1400,6 +1400,7 @@ static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
- else
- precharge = 5;
-
-+ /* Max timeout value on G4x-BDW: 1.6ms */
- if (IS_BROADWELL(dev_priv))
- timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
- else
-@@ -1426,6 +1427,12 @@ static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
- enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
- u32 ret;
-
-+ /*
-+ * Max timeout values:
-+ * SKL-GLK: 1.6ms
-+ * CNL: 3.2ms
-+ * ICL+: 4ms
-+ */
- ret = DP_AUX_CH_CTL_SEND_BUSY |
- DP_AUX_CH_CTL_DONE |
- DP_AUX_CH_CTL_INTERRUPT |
-diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
-index d8c6d7054d11..f916b9f04b6b 100644
---- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
-+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
-@@ -93,6 +93,18 @@ static void intel_dp_read_lttpr_phy_caps(struct intel_dp *intel_dp,
-
- static bool intel_dp_read_lttpr_common_caps(struct intel_dp *intel_dp)
- {
-+ struct drm_i915_private *i915 = dp_to_i915(intel_dp);
-+
-+ if (intel_dp_is_edp(intel_dp))
-+ return false;
-+
-+ /*
-+ * Detecting LTTPRs must be avoided on platforms with an AUX timeout
-+ * period < 3.2ms. (see DP Standard v2.0, 2.11.2, 3.6.6.1).
-+ */
-+ if (INTEL_GEN(i915) < 10)
-+ return false;
-+
- if (drm_dp_read_lttpr_common_caps(&intel_dp->aux,
- intel_dp->lttpr_common_caps) < 0) {
- memset(intel_dp->lttpr_common_caps, 0,
-@@ -138,9 +150,6 @@ int intel_dp_lttpr_init(struct intel_dp *intel_dp)
- bool ret;
- int i;
-
-- if (intel_dp_is_edp(intel_dp))
-- return 0;
--
- ret = intel_dp_read_lttpr_common_caps(intel_dp);
-
- /*
---
-2.31.1
-