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ALSA: hda: Add dma stop delay variable 

A variable dma_stop_delay is added as a new member in hdac_bus
structure to avoid memory decode error incase DMA RUN bit is not
disabled in the given timeout from snd_hdac_stream_sync function and
followed by stream reset which results in memory decode error between
reset set and clear operation.

Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
Link: https://lore.kernel.org/r/20200805095221.5476-3-mkumard@nvidia.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mohan Kumar 2020-08-05 15:22:20 +05:30 committed by Takashi Iwai
parent 6c17e9dd5c
commit 4106820b90
2 changed files with 10 additions and 0 deletions
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3
include/sound/hdaudio.h
View File

@ -347,6 +347,9 @@ struct hdac_bus {
int bdl_pos_adj; /* BDL position adjustment */
/* delay time in us for dma stop */
unsigned int dma_stop_delay;
/* locks */
spinlock_t reg_lock;
struct mutex cmd_mutex;

7
sound/hda/hdac_stream.c
View File

@ -150,9 +150,12 @@ void snd_hdac_stream_reset(struct hdac_stream *azx_dev)
{
unsigned char val;
int timeout;
int dma_run_state;
snd_hdac_stream_clear(azx_dev);
dma_run_state = snd_hdac_stream_readb(azx_dev, SD_CTL) & SD_CTL_DMA_START;
snd_hdac_stream_updateb(azx_dev, SD_CTL, 0, SD_CTL_STREAM_RESET);
udelay(3);
timeout = 300;
@ -162,6 +165,10 @@ void snd_hdac_stream_reset(struct hdac_stream *azx_dev)
if (val)
break;
} while (--timeout);
if (azx_dev->bus->dma_stop_delay && dma_run_state)
udelay(azx_dev->bus->dma_stop_delay);
val &= ~SD_CTL_STREAM_RESET;
snd_hdac_stream_writeb(azx_dev, SD_CTL, val);
udelay(3);