From: Sascha Hauer s.hauer@pengutronix.de
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 --- drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h | 1 + drivers/staging/imx-drm/ipu-v3/ipu-common.c | 23 ++++++++++++++--------- drivers/staging/imx-drm/ipuv3-crtc.c | 1 + 3 files changed, 16 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 9bee640..4826b5c 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 f90bdb4..5ca42f0 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) */ diff --git a/drivers/staging/imx-drm/ipuv3-crtc.c b/drivers/staging/imx-drm/ipuv3-crtc.c index 6fd37a7..574633b 100644 --- a/drivers/staging/imx-drm/ipuv3-crtc.c +++ b/drivers/staging/imx-drm/ipuv3-crtc.c @@ -102,6 +102,7 @@ static void ipu_fb_disable(struct ipu_crtc *ipu_crtc) if (ipu_crtc->dp) ipu_dp_disable_channel(ipu_crtc->dp); ipu_dc_disable_channel(ipu_crtc->dc); + ipu_idmac_wait_busy(ipu_crtc->ipu_ch, 50); ipu_idmac_disable_channel(ipu_crtc->ipu_ch); ipu_dmfc_disable_channel(ipu_crtc->dmfc); ipu_di_disable(ipu_crtc->di);