This is a note to let you know that I've just added the patch titled
drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-pretend-cursor-is-always-on-for-ilk-style-wm-calculations-v2.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e2e407dc093f530b771ee8bf8fe1be41e3cea8b3 Mon Sep 17 00:00:00 2001
From: Matt Roper <matthew.d.roper@xxxxxxxxx>
Date: Mon, 8 Feb 2016 11:05:28 -0800
Subject: drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)
From: Matt Roper <matthew.d.roper@xxxxxxxxx>
commit e2e407dc093f530b771ee8bf8fe1be41e3cea8b3 upstream.
Due to our lack of two-step watermark programming, our driver has
historically pretended that the cursor plane is always on for the
purpose of watermark calculations; this helps avoid serious flickering
when the cursor turns off/on (e.g., when the user moves the mouse
pointer to a different screen). That workaround was accidentally
dropped as we started working toward atomic watermark updates. Since we
still aren't quite there yet with two-stage updates, we need to
resurrect the workaround and treat the cursor as always active.
v2: Tweak cursor width calculations slightly to more closely match the
logic we used before the atomic overhaul began. (Ville)
Cc: simdev11@xxxxxxxxxxx
Cc: manfred.kitzbichler@xxxxxxxxx
Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx
Reported-by: simdev11@xxxxxxxxxxx
Reported-by: manfred.kitzbichler@xxxxxxxxx
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93892
Fixes: 43d59eda1 ("drm/i915: Eliminate usage of plane_wm_parameters from ILK-style WM code (v2)")
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1454479611-6804-1-git-send-email-matthew.d.roper@xxxxxxxxx
(cherry picked from commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1454958328-30129-1-git-send-email-matthew.d.roper@xxxxxxxxx
Tested-by: Jay <mymailclone@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1789,16 +1789,20 @@ static uint32_t ilk_compute_cur_wm(const
const struct intel_plane_state *pstate,
uint32_t mem_value)
{
- int bpp = pstate->base.fb ? pstate->base.fb->bits_per_pixel / 8 : 0;
+ /*
+ * We treat the cursor plane as always-on for the purposes of watermark
+ * calculation. Until we have two-stage watermark programming merged,
+ * this is necessary to avoid flickering.
+ */
+ int cpp = 4;
+ int width = pstate->visible ? pstate->base.crtc_w : 64;
- if (!cstate->base.active || !pstate->visible)
+ if (!cstate->base.active)
return 0;
return ilk_wm_method2(ilk_pipe_pixel_rate(cstate),
cstate->base.adjusted_mode.crtc_htotal,
- drm_rect_width(&pstate->dst),
- bpp,
- mem_value);
+ width, cpp, mem_value);
}
/* Only for WM_LP. */
Patches currently in stable-queue which might be from matthew.d.roper@xxxxxxxxx are
queue-4.4/drm-i915-pretend-cursor-is-always-on-for-ilk-style-wm-calculations-v2.patch
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