some codec initializtion depends on i2s's mclk/lrck, when codec enter
deep sleep, codec power loss, then codec resume and reinit
codec logic which need mclk/lrck, if these clk is not ready, codec will
work abnormally.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
do_blockdev_direct_IO() increments and decrements the inode
->i_dio_count for each IO operation. It does this to protect against
truncate of a file. Block devices don't need this sort of protection.
For a capable multiqueue setup, this atomic int is the only shared
state between applications accessing the device for O_DIRECT, and it
presents a scaling wall for that. In my testing, as much as 30% of
system time is spent incrementing and decrementing this value. A mixed
read/write workload improved from ~2.5M IOPS to ~9.6M IOPS, with
better latencies too. Before:
clat percentiles (usec):
| 1.00th=[ 33], 5.00th=[ 34], 10.00th=[ 34], 20.00th=[ 34],
| 30.00th=[ 34], 40.00th=[ 34], 50.00th=[ 35], 60.00th=[ 35],
| 70.00th=[ 35], 80.00th=[ 35], 90.00th=[ 37], 95.00th=[ 80],
| 99.00th=[ 98], 99.50th=[ 151], 99.90th=[ 155], 99.95th=[ 155],
| 99.99th=[ 165]
After:
clat percentiles (usec):
| 1.00th=[ 95], 5.00th=[ 108], 10.00th=[ 129], 20.00th=[ 149],
| 30.00th=[ 155], 40.00th=[ 161], 50.00th=[ 167], 60.00th=[ 171],
| 70.00th=[ 177], 80.00th=[ 185], 90.00th=[ 201], 95.00th=[ 270],
| 99.00th=[ 390], 99.50th=[ 398], 99.90th=[ 418], 99.95th=[ 422],
| 99.99th=[ 438]
In other setups, Robert Elliott reported seeing good performance
improvements:
https://lkml.org/lkml/2015/4/3/557
The more applications accessing the device, the worse it gets.
Add a new direct-io flags, DIO_SKIP_DIO_COUNT, which tells
do_blockdev_direct_IO() that it need not worry about incrementing
or decrementing the inode i_dio_count for this caller.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Elliott, Robert (Server Storage) <elliott@hp.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-and-Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
KERNEL_READ equal READ puls REQ_KERNEL, which indicates
this brq comes from direct-io. Any block-layer devices who
care this req type can get it now.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Direct IO of filesystem had recursive searched and map the addr
itself, so mmc drivers can avoid to do the same ops in order to
improve throughput. We got 30% improvement for 4KB bs packet test.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Add if statement(DMA_ATTR_SKIP_CPU_SYNC) for __swiotlb_map_sg_attrs
to skip invalidating each sg element
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
For some sink, it will random recognize YCbCr as RGB when swithing
hdmi format, picture will covered with purple. If we set color
fomat in avi to RGB and reset avi to YCbCr, picture will be ok. So
we set avi to RGB before mute ouput when switching hdmi format.
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
because of DMA_SLAVE_BUSWIDTH_4_BYTES, we support SNDRV_PCM_FMTBIT_S24_LE
which store data in low three bytes. not support SNDRV_PCM_FMTBIT_S24_3LE
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
use regmap_reinit_cache to restore hw registers after power loss
during a suspend/resume cycle.
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
