Commit 91961a85 authored Oct 04, 2018 by Paulo Zanoni

drm/i915: fix the transition minimums for gen9+ watermarks

The transition minimum is 14 blocks for gens 9 and 10, and 4 blocks
for gen 11. This minimum value is supposed to be added to the
configurable trans_amount. This matches both BSpec and additional
information provided by our HW engineers.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181004231600.14101-3-paulo.r.zanoni@intel.com

parent ef51e0a3

drivers/gpu/drm/i915/intel_pm.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -4875,8 +4875,8 @@ static void skl_compute_transition_wm(struct intel_crtc_state *cstate,
		if (!dev_priv->ipc_enabled)
		goto exit;

		trans_min = 0;
		if (INTEL_GEN(dev_priv) >= 10)
		trans_min = 14;
		if (INTEL_GEN(dev_priv) >= 11)
		trans_min = 4;

		trans_offset_b = trans_min + trans_amount;