diff options
Diffstat (limited to 'drivers/gpu/host1x/channel.c')
| -rw-r--r-- | drivers/gpu/host1x/channel.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/channel.c b/drivers/gpu/host1x/channel.c index 2d0051d6314c..08077afe4cde 100644 --- a/drivers/gpu/host1x/channel.c +++ b/drivers/gpu/host1x/channel.c @@ -27,6 +27,8 @@ int host1x_channel_list_init(struct host1x_channel_list *chlist, return -ENOMEM; } + mutex_init(&chlist->lock); + return 0; } @@ -79,6 +81,25 @@ void host1x_channel_stop(struct host1x_channel *channel) } EXPORT_SYMBOL(host1x_channel_stop); +/** + * host1x_channel_stop_all() - disable CDMA on allocated channels + * @host: host1x instance + * + * Stop CDMA on allocated channels + */ +void host1x_channel_stop_all(struct host1x *host) +{ + struct host1x_channel_list *chlist = &host->channel_list; + int bit; + + mutex_lock(&chlist->lock); + + for_each_set_bit(bit, chlist->allocated_channels, host->info->nb_channels) + host1x_channel_stop(&chlist->channels[bit]); + + mutex_unlock(&chlist->lock); +} + static void release_channel(struct kref *kref) { struct host1x_channel *channel = @@ -104,8 +125,11 @@ static struct host1x_channel *acquire_unused_channel(struct host1x *host) unsigned int max_channels = host->info->nb_channels; unsigned int index; + mutex_lock(&chlist->lock); + index = find_first_zero_bit(chlist->allocated_channels, max_channels); if (index >= max_channels) { + mutex_unlock(&chlist->lock); dev_err(host->dev, "failed to find free channel\n"); return NULL; } @@ -114,6 +138,8 @@ static struct host1x_channel *acquire_unused_channel(struct host1x *host) set_bit(index, chlist->allocated_channels); + mutex_unlock(&chlist->lock); + return &chlist->channels[index]; } |