This is a note to let you know that I've just added the patch titled
drm/amdgpu: Add missing lb_vblank_lead_lines setup to DCE-6 path.
to the 4.9-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-amdgpu-add-missing-lb_vblank_lead_lines-setup-to-dce-6-path.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From effaf848b957fbf72a3b6a1ad87f5e031eda0b75 Mon Sep 17 00:00:00 2001
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Date: Mon, 24 Apr 2017 01:02:46 +0200
Subject: drm/amdgpu: Add missing lb_vblank_lead_lines setup to DCE-6 path.
From: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
commit effaf848b957fbf72a3b6a1ad87f5e031eda0b75 upstream.
This apparently got lost when implementing the new DCE-6 support
and would cause failures in pageflip scheduling and timestamping.
Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/dce_v6_0.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v6_0.c
@@ -1050,7 +1050,7 @@ static void dce_v6_0_program_watermarks(
u32 priority_a_mark = 0, priority_b_mark = 0;
u32 priority_a_cnt = PRIORITY_OFF;
u32 priority_b_cnt = PRIORITY_OFF;
- u32 tmp, arb_control3;
+ u32 tmp, arb_control3, lb_vblank_lead_lines = 0;
fixed20_12 a, b, c;
if (amdgpu_crtc->base.enabled && num_heads && mode) {
@@ -1162,6 +1162,8 @@ static void dce_v6_0_program_watermarks(
c.full = dfixed_div(c, a);
priority_b_mark = dfixed_trunc(c);
priority_b_cnt |= priority_b_mark & PRIORITY_MARK_MASK;
+
+ lb_vblank_lead_lines = DIV_ROUND_UP(lb_size, mode->crtc_hdisplay);
}
/* select wm A */
@@ -1191,6 +1193,9 @@ static void dce_v6_0_program_watermarks(
/* save values for DPM */
amdgpu_crtc->line_time = line_time;
amdgpu_crtc->wm_high = latency_watermark_a;
+
+ /* Save number of lines the linebuffer leads before the scanout */
+ amdgpu_crtc->lb_vblank_lead_lines = lb_vblank_lead_lines;
}
/* watermark setup */
Patches currently in stable-queue which might be from mario.kleiner.de@xxxxxxxxx are
queue-4.9/drm-amdgpu-add-missing-lb_vblank_lead_lines-setup-to-dce-6-path.patch
queue-4.9/drm-amdgpu-avoid-overflows-divide-by-zero-in-latency_watermark-calculations.patch
queue-4.9/drm-amdgpu-make-display-watermark-calculations-more-accurate.patch