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authorMario Kleiner <mario.kleiner.de@gmail.com>2014-07-29 06:21:44 +0200
committerAlex Deucher <alexander.deucher@amd.com>2014-08-05 08:54:00 -0400
commit39dc5454e33b9e76d437bef1bdc1a453a81a2fc2 (patch)
tree8c19ec5d4cea956bf13d494a1e33d53be2e36eaf /drivers/gpu/drm/radeon/radeon.h
parent9eb401af05f298ba1e85e3f1e980dc8c826fb31d (diff)
downloadlinux-stericsson-39dc5454e33b9e76d437bef1bdc1a453a81a2fc2.tar.gz
drm/radeon: Use pflip irqs for pageflip completion if possible. (v2)
Skip the "manual" pageflip completion checks via polling and guessing in the vblank handler radeon_crtc_handle_vblank() on asics which are known to reliably support hw pageflip completion irqs. Those pflip irqs are a more reliable and race-free method of handling pageflip completion detection, whereas the "classic" polling method has some small races in combination with dpm on, and with the reworked pageflip implementation since Linux 3.16. On old asics without pflip irqs, the classic method is used. On asics with known good pflip irqs, only pflip irqs are used by default, but a new module parameter "use_pflipirqs" allows to override this in case we encounter asics in the wild with unreliable or faulty pflip irqs. A module parameter of 0 allows to use the classic method only in such a case. A parameter of 1 allows to use both classic method and pflip irqs as additional band-aid to avoid some small races which could happen with the classic method alone. The setting 1 gives Linux 3.16 behaviour. Hw pflip irqs are available since R600. Tested on DCE-4, AMD Cedar - FirePro 2270. v2: agd5f: only enable pflip interrupts on DCE4+ as they are not reliable on older asics. Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon.h')
-rw-r--r--drivers/gpu/drm/radeon/radeon.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 142cad63c3fa..9e1732eb402c 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -104,6 +104,7 @@ extern int radeon_hard_reset;
extern int radeon_vm_size;
extern int radeon_vm_block_size;
extern int radeon_deep_color;
+extern int radeon_use_pflipirq;
/*
* Copy from radeon_drv.h so we don't have to include both and have conflicting