0a3e67a4ca
Previously, drivers supporting vblank interrupt waits would run the interrupt all the time, or all the time that any 3d client was running, preventing the CPU from sleeping for long when the system was otherwise idle. Now, interrupts are disabled any time that no client is waiting on a vblank event. The new method uses vblank counters on the chipsets when the interrupts are turned off, rather than counting interrupts, so that we can continue to present accurate vblank numbers. Co-author: Michel Dänzer <michel@tungstengraphics.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
/* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
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/*
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* Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
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*
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* The Weather Channel (TM) funded Tungsten Graphics to develop the
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* initial release of the Radeon 8500 driver under the XFree86 license.
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* This notice must be preserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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* Eric Anholt <anholt@FreeBSD.org>
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "r128_drm.h"
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#include "r128_drv.h"
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u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
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{
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const drm_r128_private_t *dev_priv = dev->dev_private;
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if (crtc != 0)
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return 0;
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return atomic_read(&dev_priv->vbl_received);
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}
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irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
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{
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struct drm_device *dev = (struct drm_device *) arg;
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drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
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int status;
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status = R128_READ(R128_GEN_INT_STATUS);
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/* VBLANK interrupt */
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if (status & R128_CRTC_VBLANK_INT) {
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R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
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atomic_inc(&dev_priv->vbl_received);
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drm_handle_vblank(dev, 0);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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int r128_enable_vblank(struct drm_device *dev, int crtc)
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{
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drm_r128_private_t *dev_priv = dev->dev_private;
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if (crtc != 0) {
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DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
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return -EINVAL;
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}
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R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
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return 0;
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}
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void r128_disable_vblank(struct drm_device *dev, int crtc)
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{
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if (crtc != 0)
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DRM_ERROR("%s: bad crtc %d\n", __func__, crtc);
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/*
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* FIXME: implement proper interrupt disable by using the vblank
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* counter register (if available)
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*
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* R128_WRITE(R128_GEN_INT_CNTL,
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* R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
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*/
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}
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void r128_driver_irq_preinstall(struct drm_device * dev)
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{
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drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
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/* Disable *all* interrupts */
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R128_WRITE(R128_GEN_INT_CNTL, 0);
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/* Clear vblank bit if it's already high */
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R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
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}
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int r128_driver_irq_postinstall(struct drm_device *dev)
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{
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return drm_vblank_init(dev, 1);
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}
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void r128_driver_irq_uninstall(struct drm_device * dev)
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{
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drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
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if (!dev_priv)
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return;
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/* Disable *all* interrupts */
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R128_WRITE(R128_GEN_INT_CNTL, 0);
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}
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