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Revert "drm: crc: Wait for a frame before returning from open()" 

This reverts commit e8fa567118.

Don't wait for first CRC during crtc_crc_open. It avoids one frame wait
during open. If application want to wait after read call, it can use
poll/read blocking read() call.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180821083858.26275-4-mahesh1.kumar@intel.com
hifive-unleashed-5.1
Mahesh Kumar 2018-08-21 14:08:57 +05:30 committed by Rodrigo Vivi
parent c0811a7d5b
commit ad1a56f1bf
1 changed files with 0 additions and 16 deletions
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16
drivers/gpu/drm/drm_debugfs_crc.c
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@ -228,24 +228,8 @@ static int crtc_crc_open(struct inode *inode, struct file *filep)
if (ret)
goto err;
spin_lock_irq(&crc->lock);
/*
* Only return once we got a first frame, so userspace doesn't have to
* guess when this particular piece of HW will be ready to start
* generating CRCs.
*/
ret = wait_event_interruptible_lock_irq(crc->wq,
crtc_crc_data_count(crc),
crc->lock);
spin_unlock_irq(&crc->lock);
if (ret)
goto err_disable;
return 0;
err_disable:
crtc->funcs->set_crc_source(crtc, NULL);
err:
spin_lock_irq(&crc->lock);
crtc_crc_cleanup(crc);