This is a note to let you know that I've just added the patch titled
drm/radeon: change vblank_time's calculation method to reduce computational error.
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-radeon-change-vblank_time-s-calculation-method-to-reduce-computational-error.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 02cfb5fccb0f9f968f0e208d89d9769aa16267bc Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 12 Oct 2016 15:28:55 -0400
Subject: drm/radeon: change vblank_time's calculation method to reduce computational error.
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 02cfb5fccb0f9f968f0e208d89d9769aa16267bc upstream.
Ported from Rex's amdgpu change.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/r600_dpm.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
--- a/drivers/gpu/drm/radeon/r600_dpm.c
+++ b/drivers/gpu/drm/radeon/r600_dpm.c
@@ -156,19 +156,20 @@ u32 r600_dpm_get_vblank_time(struct rade
struct drm_device *dev = rdev->ddev;
struct drm_crtc *crtc;
struct radeon_crtc *radeon_crtc;
- u32 line_time_us, vblank_lines;
+ u32 vblank_in_pixels;
u32 vblank_time_us = 0xffffffff; /* if the displays are off, vblank time is max */
if (rdev->num_crtc && rdev->mode_info.mode_config_initialized) {
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
radeon_crtc = to_radeon_crtc(crtc);
if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
- line_time_us = (radeon_crtc->hw_mode.crtc_htotal * 1000) /
- radeon_crtc->hw_mode.clock;
- vblank_lines = radeon_crtc->hw_mode.crtc_vblank_end -
- radeon_crtc->hw_mode.crtc_vdisplay +
- (radeon_crtc->v_border * 2);
- vblank_time_us = vblank_lines * line_time_us;
+ vblank_in_pixels =
+ radeon_crtc->hw_mode.crtc_htotal *
+ (radeon_crtc->hw_mode.crtc_vblank_end -
+ radeon_crtc->hw_mode.crtc_vdisplay +
+ (radeon_crtc->v_border * 2));
+
+ vblank_time_us = vblank_in_pixels * 1000 / radeon_crtc->hw_mode.clock;
break;
}
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.4/drm-amdgpu-dce11-add-missing-drm_mode_config_cleanup-call.patch
queue-4.4/drm-radeon-si-dpm-fix-phase-shedding-setup.patch
queue-4.4/drm-amdgpu-dce11-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-dce8-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-dce10-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-fix-ib-alignment-for-uvd.patch
queue-4.4/drm-amdgpu-change-vblank_time-s-calculation-method-to-reduce-computational-error.patch
queue-4.4/drm-radeon-narrow-asic_init-for-virtualization.patch
queue-4.4/drm-radeon-change-vblank_time-s-calculation-method-to-reduce-computational-error.patch
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