From a6fce8e0fff0e5d3dc567cc1085c41f08e11672d Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@gmail.com>
Date: Mon, 16 Mar 2020 05:23:40 +0100
Subject: drm/i915/dp: Add dpcd link_rate quirk for Apple 15" MBP 2017 (v3)
Git-commit: 639e0db2d70fb84833d96e782cc4a01825e03b13
Patch-mainline: v5.8-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
This fixes a problem found on the MacBookPro 2017 Retina panel.
The panel reports 10 bpc color depth in its EDID, and the
firmware chooses link settings at boot which support enough
bandwidth for 10 bpc (324000 kbit/sec = multiplier 0xc),
but the DP_MAX_LINK_RATE dpcd register only reports
2.7 Gbps (multiplier value 0xa) as possible, in direct
contradiction of what the firmware successfully set up.
This restricts the panel to 8 bpc, not providing the full
color depth of the panel.
This patch adds a quirk specific to the MBP 2017 15" Retina
panel to add the additiional 324000 kbps link rate during
edp setup.
Link to previous discussion of a different attempted fix
with Ville and Jani:
https://patchwork.kernel.org/patch/11325935/
v2: Follow Jani's proposal of defining quirk_rates[] instead
of just appending 324000. This for better clarity.
v3: Rebased onto current drm-tip, as of 16-March-2020. Adapt
to new edid_quirks parameter of drm_dp_has_quirk().
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Tested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200316042340.4783-1-mario.kleiner.de@gmail.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/drm_dp_helper.c | 2 ++
drivers/gpu/drm/i915/display/intel_dp.c | 11 +++++++++++
include/drm/drm_dp_helper.h | 7 +++++++
3 files changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c6fbe6e6bc9d..8ba4531e808d 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1238,6 +1238,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
{ OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) },
/* Synaptics DP1.4 MST hubs can support DSC without virtual DPCD */
{ OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) },
+ /* Apple MacBookPro 2017 15 inch eDP Retina panel reports too low DP_MAX_LINK_RATE */
+ { OUI(0x00, 0x10, 0xfa), DEVICE_ID(101, 68, 21, 101, 98, 97), false, BIT(DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS) },
};
#undef OUI
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index a2fafd4499f2..23064f159d8d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -164,6 +164,17 @@ static void intel_dp_set_sink_rates(struct intel_dp *intel_dp)
};
int i, max_rate;
+ if (drm_dp_has_quirk(&intel_dp->desc, 0,
+ DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS)) {
+ /* Needed, e.g., for Apple MBP 2017, 15 inch eDP Retina panel */
+ static const int quirk_rates[] = { 162000, 270000, 324000 };
+
+ memcpy(intel_dp->sink_rates, quirk_rates, sizeof(quirk_rates));
+ intel_dp->num_sink_rates = ARRAY_SIZE(quirk_rates);
+
+ return;
+ }
+
max_rate = drm_dp_bw_code_to_link_rate(intel_dp->dpcd[DP_MAX_LINK_RATE]);
for (i = 0; i < ARRAY_SIZE(dp_rates); i++) {
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index c6119e4c169a..9d87cdf2740a 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1548,6 +1548,13 @@ enum drm_dp_quirk {
* capabilities advertised.
*/
DP_QUIRK_FORCE_DPCD_BACKLIGHT,
+ /**
+ * @DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS:
+ *
+ * The device supports a link rate of 3.24 Gbps (multiplier 0xc) despite
+ * the DP_MAX_LINK_RATE register reporting a lower max multiplier.
+ */
+ DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS,
};
/**
--
2.28.0