* FAILED: patch "[PATCH] drm/i915/dsc: force full modeset whenever DSC is enabled at" failed to apply to 5.5-stable tree
@ 2020-02-27 8:26 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2020-02-27 8:26 UTC (permalink / raw)
To: jani.nikula, manasi.d.navare, matthew.d.roper, vandita.kulkarni,
ville.syrjala
Cc: stable
The patch below does not apply to the 5.5-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2e0a576511f656933adfe56ef03b9cf3e64b21b7 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@intel.com>
Date: Thu, 13 Feb 2020 16:04:11 +0200
Subject: [PATCH] drm/i915/dsc: force full modeset whenever DSC is enabled at
probe
We lack full state readout of DSC config, which may lead to DSC enable
using a config that's all zeros, failing spectacularly. Force full
modeset and thus compute config at probe to get a sane state, until we
implement DSC state readout. Any fastset that did appear to work with
DSC at probe, worked by coincidence. [1] is an example of a change that
triggered the issue on TGL DSI DSC.
[1] http://patchwork.freedesktop.org/patch/msgid/20200212150102.7600-1-ville.syrjala@linux.intel.com
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org
Fixes: fbacb15ea814 ("drm/i915/dsc: add basic hardware state readout support")
Acked-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213140412.32697-3-stanislav.lisovskiy@intel.com
(cherry picked from commit a4277aa398d76db109d6b8420934f68daf69a6c3)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 064dd99bbc49..e68ec25fc97c 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -17433,6 +17433,24 @@ static int intel_initial_commit(struct drm_device *dev)
* have readout for pipe gamma enable.
*/
crtc_state->uapi.color_mgmt_changed = true;
+
+ /*
+ * FIXME hack to force full modeset when DSC is being
+ * used.
+ *
+ * As long as we do not have full state readout and
+ * config comparison of crtc_state->dsc, we have no way
+ * to ensure reliable fastset. Remove once we have
+ * readout for DSC.
+ */
+ if (crtc_state->dsc.compression_enable) {
+ ret = drm_atomic_add_affected_connectors(state,
+ &crtc->base);
+ if (ret)
+ goto out;
+ crtc_state->uapi.mode_changed = true;
+ drm_dbg_kms(dev, "Force full modeset for DSC\n");
+ }
}
}
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2020-02-27 8:26 FAILED: patch "[PATCH] drm/i915/dsc: force full modeset whenever DSC is enabled at" failed to apply to 5.5-stable tree gregkh
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