diff options
author | Sascha Hauer <s.hauer@pengutronix.de> | 2013-10-10 18:18:41 +0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-12 02:30:33 +0400 |
commit | fb822a395f6deabd9a87838a4e3da4b87c801876 (patch) | |
tree | c38dc43c55ca0c4cbcc3cdeaadfcec208ee9d781 /drivers/staging/imx-drm/ipu-v3 | |
parent | 0b186416c943eebfad070d38768cc3f2a80d5443 (diff) | |
download | linux-fb822a395f6deabd9a87838a4e3da4b87c801876.tar.xz |
staging: drm/imx: make waiting for idle channel optional
Currently we wait for a channel until it's idle before actually
disabling it. This is not needed for all channels though, so make
waiting for idle a separate function and call it where necessary.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/imx-drm/ipu-v3')
-rw-r--r-- | drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h | 1 | ||||
-rw-r--r-- | drivers/staging/imx-drm/ipu-v3/ipu-common.c | 23 |
2 files changed, 15 insertions, 9 deletions
diff --git a/drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h b/drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h index 9bee6403f1e5..4826b5c0249d 100644 --- a/drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h +++ b/drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h @@ -97,6 +97,7 @@ void ipu_idmac_put(struct ipuv3_channel *); int ipu_idmac_enable_channel(struct ipuv3_channel *channel); int ipu_idmac_disable_channel(struct ipuv3_channel *channel); +int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms); void ipu_idmac_set_double_buffer(struct ipuv3_channel *channel, bool doublebuffer); diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-common.c b/drivers/staging/imx-drm/ipu-v3/ipu-common.c index f90bdb4c08c2..5ca42f090088 100644 --- a/drivers/staging/imx-drm/ipu-v3/ipu-common.c +++ b/drivers/staging/imx-drm/ipu-v3/ipu-common.c @@ -698,24 +698,29 @@ int ipu_idmac_enable_channel(struct ipuv3_channel *channel) } EXPORT_SYMBOL_GPL(ipu_idmac_enable_channel); -int ipu_idmac_disable_channel(struct ipuv3_channel *channel) +int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms) { struct ipu_soc *ipu = channel->ipu; - u32 val; - unsigned long flags; unsigned long timeout; - timeout = jiffies + msecs_to_jiffies(50); + timeout = jiffies + msecs_to_jiffies(ms); while (ipu_idmac_read(ipu, IDMAC_CHA_BUSY(channel->num)) & idma_mask(channel->num)) { - if (time_after(jiffies, timeout)) { - dev_warn(ipu->dev, "disabling busy idmac channel %d\n", - channel->num); - break; - } + if (time_after(jiffies, timeout)) + return -ETIMEDOUT; cpu_relax(); } + return 0; +} +EXPORT_SYMBOL_GPL(ipu_idmac_wait_busy); + +int ipu_idmac_disable_channel(struct ipuv3_channel *channel) +{ + struct ipu_soc *ipu = channel->ipu; + u32 val; + unsigned long flags; + spin_lock_irqsave(&ipu->lock, flags); /* Disable DMA channel(s) */ |