[PATCH v4 4/7] gpu: ipu-v3: Do not wait for DMFC FIFO to clear when disabling DMFC channel

[Liu Ying]

According to basic tests, it looks there is no issue if we don't wait for
DMFC FIFO to clear when disabling DMFC channel.  NXP BSP doesn't do that,
either.  This patch is needed to avoid the annoying warning caused by a
timeout on waiting for the FIFO to clear after we add the new
DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET flag to the imx-drm driver
which changes the procedure to disable display channel slightly.

Cc: Philipp Zabel <p.zabel at pengutronix.de>
Cc: David Airlie <airlied at linux.ie>
Cc: Russell King <linux at armlinux.org.uk>
Cc: Peter Senna Tschudin <peter.senna at gmail.com>
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Liu Ying <gnuiyl at gmail.com>
---
v4:
* Newly introduced in v4.

 drivers/gpu/ipu-v3/ipu-dmfc.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-dmfc.c b/drivers/gpu/ipu-v3/ipu-dmfc.c
index 42705bb..a40f211 100644
--- a/drivers/gpu/ipu-v3/ipu-dmfc.c
+++ b/drivers/gpu/ipu-v3/ipu-dmfc.c
@@ -123,20 +123,6 @@ int ipu_dmfc_enable_channel(struct dmfc_channel *dmfc)
 }
 EXPORT_SYMBOL_GPL(ipu_dmfc_enable_channel);
 
-static void ipu_dmfc_wait_fifos(struct ipu_dmfc_priv *priv)
-{
-	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
-
-	while ((readl(priv->base + DMFC_STAT) & 0x02fff000) != 0x02fff000) {
-		if (time_after(jiffies, timeout)) {
-			dev_warn(priv->dev,
-				 "Timeout waiting for DMFC FIFOs to clear\n");
-			break;
-		}
-		cpu_relax();
-	}
-}
-
 void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc)
 {
 	struct ipu_dmfc_priv *priv = dmfc->priv;
@@ -145,10 +131,8 @@ void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc)
 
 	priv->use_count--;
 
-	if (!priv->use_count) {
-		ipu_dmfc_wait_fifos(priv);
+	if (!priv->use_count)
 		ipu_module_disable(priv->ipu, IPU_CONF_DMFC_EN);
-	}
 
 	if (priv->use_count < 0)
 		priv->use_count = 0;
-- 
2.7.4