The X1 Extreme is one of the systems that lies about which backlight
interface that it uses in its VBIOS as PWM backlight controls don't work
at all on this machine. It's possible that this panel could be one of
the infamous ones that can switch between PWM mode and DPCD backlight
control mode, but we haven't gotten any more details on this from Lenovo
just yet. For the time being though, making sure the backlight 'just
works' is a bit more important.
So, add a quirk to force DPCD backlight controls on for these systems
based on EDID (since this panel doesn't appear to fill in the device ID).
Hopefully in the future we'll figure out a better way of probing this.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Reviewed-by: Adam Jackson <ajax@xxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Changes since v2:
* The bugzilla URL is deprecated, bug reporting happens on gitlab now.
Update the messages we print to reflect this
* Also, take the opportunity to move FDO_BUG_URL out of i915_utils.c and
into i915_utils.h so that other places which print things that aren't
traditional errors but are worth filing bugs about, can actually use
it.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_helper.c | 4 ++++
.../drm/i915/display/intel_dp_aux_backlight.c | 24 +++++++++++++++----
drivers/gpu/drm/i915/i915_utils.c | 1 -
drivers/gpu/drm/i915/i915_utils.h | 2 ++
include/drm/drm_dp_helper.h | 10 ++++++++
5 files changed, 36 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 9b2ea2ae0204..026f701eac69 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1237,6 +1237,10 @@ struct edid_quirk {
* DP quirks in such cases.
*/
static const struct edid_quirk edid_quirk_list[] = {
+ /* Optional 4K AMOLED panel in the ThinkPad X1 Extreme 2nd Generation
+ * only supports DPCD backlight controls
+ */
+ { MFG(0x4c, 0x83), PROD_ID(0x41, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
};
#undef MFG
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index 77a759361c5c..a7c94c201b38 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -328,15 +328,31 @@ intel_dp_aux_display_control_capable(struct intel_connector *connector)
int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
{
struct intel_panel *panel = &intel_connector->panel;
- struct drm_i915_private *dev_priv = to_i915(intel_connector->base.dev);
+ struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder);
+ struct drm_device *dev = intel_connector->base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
if (i915_modparams.enable_dpcd_backlight == 0 ||
- (i915_modparams.enable_dpcd_backlight == -1 &&
- dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE))
+ !intel_dp_aux_display_control_capable(intel_connector))
return -ENODEV;
- if (!intel_dp_aux_display_control_capable(intel_connector))
+ /*
+ * There are a lot of machines that don't advertise the backlight
+ * control interface to use properly in their VBIOS, :\
+ */
+ if (dev_priv->vbt.backlight.type !=
+ INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE &&
+ !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks,
+ DP_QUIRK_FORCE_DPCD_BACKLIGHT)) {
+ DRM_DEV_INFO(dev->dev,
+ "Panel advertises DPCD backlight support, but "
+ "VBT disagrees. If your backlight controls "
+ "don't work try booting with "
+ "i915.enable_dpcd_backlight=1. If your machine "
+ "needs this, please file a _new_ bug report on "
+ "drm/i915, see " FDO_BUG_URL " for details.\n");
return -ENODEV;
+ }
panel->backlight.setup = intel_dp_aux_setup_backlight;
panel->backlight.enable = intel_dp_aux_enable_backlight;
diff --git a/drivers/gpu/drm/i915/i915_utils.c b/drivers/gpu/drm/i915/i915_utils.c
index 632d6953c78d..029854ae65fc 100644
--- a/drivers/gpu/drm/i915/i915_utils.c
+++ b/drivers/gpu/drm/i915/i915_utils.c
@@ -8,7 +8,6 @@
#include "i915_drv.h"
#include "i915_utils.h"
-#define FDO_BUG_URL "https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs";
#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
void
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index b0ade76bec90..cae0ae520398 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -34,6 +34,8 @@
struct drm_i915_private;
struct timer_list;
+#define FDO_BUG_URL "https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs";
+
#undef WARN_ON
/* Many gcc seem to no see through this and fall over :( */
#if 0
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 1fe49e202dfb..eff5a69051d6 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1533,6 +1533,16 @@ enum drm_dp_quirk {
* The DSC caps can be read from the physical aux instead.
*/
DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD,
+ /**
+ * @DP_QUIRK_FORCE_DPCD_BACKLIGHT:
+ *
+ * The device is telling the truth when it says that it uses DPCD
+ * backlight controls, even if the system's firmware disagrees. This
+ * quirk should be checked against both the ident and panel EDID.
+ * When present, the driver should honor the DPCD backlight
+ * capabilities advertised.
+ */
+ DP_QUIRK_FORCE_DPCD_BACKLIGHT,
};
/**
--
2.24.1
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