diff options
| author | Damien Lespiau <damien.lespiau@intel.com> | 2013-10-15 18:55:40 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-10-16 13:32:16 +0200 |
| commit | 071444280bcbb96ec38a1fb1ee3924ca7860844a (patch) | |
| tree | 49171943b164c5f1c00fc3418e43500834e9e681 /drivers/gpu/drm/i915/i915_dma.c | |
| parent | 497666d80587933fc65dbe40d8fe6b6cc89ac9ad (diff) | |
drm/i915: Implement blocking read for pipe CRC files
seq_file is not quite the right interface for these ones. We have a
circular buffer with a new entry per vblank on one side and a process
wanting to dequeue the CRC with a read().
It's quite racy to wait for vblank in user land and then try to read a
pipe_crc file, sometimes the CRC interrupt hasn't been fired and we end
up with an EOF.
So, let's have the read on the pipe_crc file block until the interrupt
gives us a new entry. At that point we can wake the reading process.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_dma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 42cddc11c23c..9f71bc204e38 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1514,6 +1514,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) dev_priv->pc8.disable_count = 2; /* requirements_met + gpu_idle */ INIT_DELAYED_WORK(&dev_priv->pc8.enable_work, hsw_enable_pc8_work); + intel_display_crc_init(dev); + i915_dump_device_info(dev_priv); /* Not all pre-production machines fall into this category, only the |