From: Mario Kleiner Date: Thu, 22 Jun 2017 01:28:11 +0000 (+0200) Subject: drm/vc4: Allow vblank_disable_immediate on non-fw-kms. (v2) X-Git-Tag: v4.14-rc1~8^2~52^2~147 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7d2818f54e38e40232c65866b58c8b627dbf5711;p=platform%2Fkernel%2Flinux-exynos.git drm/vc4: Allow vblank_disable_immediate on non-fw-kms. (v2) With instantaneous high precision vblank timestamping that updates at leading edge of vblank, the emulated "hw vblank counter" from vblank timestamping which increments at leading edge of vblank, and reliable page flip execution and completion at leading edge of vblank, we should meet the requirements for fast vblank irq disable/enable. Testing against rpi-4.12-rc5 Linux kernel with timing measurement equipment indicates this works fine, so allow immediate vblank disable for power saving. For debugging in case of unexpected trouble, booting with kernel cmdline option drm.vblankoffdelay=0 would keep vblank irqs on to approximate old behavior. v2: Respin onto drm-misc-next, per Eric's suggestion. Drop !vc4->firmware_kms check, as the firmware_kms implementation does not exist in upstream. Signed-off-by: Mario Kleiner Cc: Eric Anholt Reviewed-by: Eric Anholt Link: http://patchwork.freedesktop.org/patch/msgid/20170622012811.2139-1-mario.kleiner.de@gmail.com --- diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index bc6ecdc..c2c9f82 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -241,6 +241,9 @@ int vc4_kms_load(struct drm_device *dev) sema_init(&vc4->async_modeset, 1); + /* Set support for vblank irq fast disable, before drm_vblank_init() */ + dev->vblank_disable_immediate = true; + ret = drm_vblank_init(dev, dev->mode_config.num_crtc); if (ret < 0) { dev_err(dev->dev, "failed to initialize vblank\n");