From 073f34d9d49bdbadbea8198ddc3fbb7e736a94dd Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Fri, 2 Nov 2012 11:13:59 -0700 Subject: [PATCH] drm/i915: don't block resume on fb console resume v2 The console lock can be contended, so rather than prevent other drivers after us from being held up, queue the console suspend into the global work queue that can happen anytime. I've measured this to take around 200ms on my T420. Combined with the ring freq/turbo change, we should save almost 1/2 a second on resume. v2: use console_trylock() to try to resume the console immediately (Chris) Signed-off-by: Jesse Barnes [danvet: move dev_priv->console_resume_work next to the fbdev pointer.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_dma.c | 3 +++ drivers/gpu/drm/i915/i915_drv.c | 27 ++++++++++++++++++++++++--- drivers/gpu/drm/i915/i915_drv.h | 7 +++++++ 3 files changed, 34 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index e6708072974..530cf90d13b 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1329,6 +1329,8 @@ static int i915_load_modeset_init(struct drm_device *dev) intel_modeset_gem_init(dev); + INIT_WORK(&dev_priv->console_resume_work, intel_console_resume); + ret = drm_irq_install(dev); if (ret) goto cleanup_gem; @@ -1723,6 +1725,7 @@ int i915_driver_unload(struct drm_device *dev) if (drm_core_check_feature(dev, DRIVER_MODESET)) { intel_fbdev_fini(dev); intel_modeset_cleanup(dev); + cancel_work_sync(&dev_priv->console_resume_work); /* * free the memory space allocated for the child device diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index a08e9cafb7f..cfd8920537c 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -523,6 +523,18 @@ int i915_suspend(struct drm_device *dev, pm_message_t state) return 0; } +void intel_console_resume(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, + console_resume_work); + struct drm_device *dev = dev_priv->dev; + + console_lock(); + intel_fbdev_set_suspend(dev, 0); + console_unlock(); +} + static int i915_drm_thaw(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -559,9 +571,18 @@ static int i915_drm_thaw(struct drm_device *dev) dev_priv->modeset_on_lid = 0; - console_lock(); - intel_fbdev_set_suspend(dev, 0); - console_unlock(); + /* + * The console lock can be pretty contented on resume due + * to all the printk activity. Try to keep it out of the hot + * path of resume if possible. + */ + if (console_trylock()) { + intel_fbdev_set_suspend(dev, 0); + console_unlock(); + } else { + schedule_work(&dev_priv->console_resume_work); + } + return error; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 135b9db5527..f8fa63deb92 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -887,6 +887,12 @@ typedef struct drm_i915_private { /* list of fbdev register on this device */ struct intel_fbdev *fbdev; + /* + * The console may be contended at resume, but we don't + * want it to block on it. + */ + struct work_struct console_resume_work; + struct backlight_device *backlight; struct drm_property *broadcast_rgb_property; @@ -1273,6 +1279,7 @@ extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv); extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv); extern void i915_update_gfx_val(struct drm_i915_private *dev_priv); +extern void intel_console_resume(struct work_struct *work); /* i915_irq.c */ void i915_hangcheck_elapsed(unsigned long data); -- 2.46.0