diff options
Diffstat (limited to '0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch')
| -rw-r--r-- | 0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch b/0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch new file mode 100644 index 000000000000..9f690c908a9c --- /dev/null +++ b/0001-drm-i915-dp-Program-source-OUI-on-eDP-panels.patch @@ -0,0 +1,65 @@ +From 14fd04fb1db60cd5028425a3cdb2041adfdbb6a2 Mon Sep 17 00:00:00 2001 +From: Lyude Paul <lyude@redhat.com> +Date: Fri, 26 Jun 2020 17:53:48 -0400 +Subject: [PATCH 1/2] drm/i915/dp: Program source OUI on eDP panels + +Since we're about to start adding support for Intel's magic HDR +backlight interface over DPCD, we need to ensure we're properly +programming this field so that Intel specific sink services are exposed. +Otherwise, 0x300-0x3ff will just read zeroes. + +We also take care not to reprogram the source OUI if it already matches +what we expect. This is just to be careful so that we don't accidentally +take the panel out of any backlight control modes we found it in. + +Signed-off-by: Lyude Paul <lyude@redhat.com> +--- + drivers/gpu/drm/i915/display/intel_dp.c | 25 +++++++++++++++++++++++++ + 1 file changed, 25 insertions(+) + +diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c +index 5e228d202e4d..9231a0ef6270 100644 +--- a/drivers/gpu/drm/i915/display/intel_dp.c ++++ b/drivers/gpu/drm/i915/display/intel_dp.c +@@ -4408,6 +4408,25 @@ static void intel_dp_get_dsc_sink_cap(struct intel_dp *intel_dp) + } + } + ++static void ++intel_edp_init_source_oui(struct intel_dp *intel_dp) ++{ ++ struct drm_i915_private *i915 = dp_to_i915(intel_dp); ++ u8 oui[] = { 0x00, 0xaa, 0x01 }; ++ u8 buf[3] = { 0 }; ++ ++ if (drm_dp_dpcd_read(&intel_dp->aux, DP_SOURCE_OUI, buf, ++ sizeof(buf)) < 0) ++ drm_err(&i915->drm, "Failed to read source OUI\n"); ++ ++ if (memcmp(oui, buf, sizeof(oui)) == 0) ++ return; ++ ++ if (drm_dp_dpcd_write(&intel_dp->aux, DP_SOURCE_OUI, oui, ++ sizeof(oui)) < 0) ++ drm_err(&i915->drm, "Failed to write source OUI\n"); ++} ++ + static bool + intel_edp_init_dpcd(struct intel_dp *intel_dp) + { +@@ -4485,6 +4504,12 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp) + if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) + intel_dp_get_dsc_sink_cap(intel_dp); + ++ /* ++ * Program our source OUI so we can make various Intel-specific AUX ++ * services available (such as HDR backlight controls) ++ */ ++ intel_edp_init_source_oui(intel_dp); ++ + return true; + } + +-- +2.27.0 + |