From: Wayne Zou <b36644@freescale.com>
Date: Tue, 15 Jan 2013 09:22:16 +0000 (+0800)
Subject: ENGR00240298 IMX IPU: Optimize IPU resize performance
X-Git-Tag: v3.0.35-fsl~152
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=25b97d798a844b8cdd5c4287731d198e28e93108;p=karo-tx-linux.git

ENGR00240298 IMX IPU: Optimize IPU resize performance

When disabling IPU channels, it needs less than 200us to wait for stop
Using msleep, it often sleep longer(above 10ms). So the extra delay
decrease the performance.

For 720p video playback on 1080p display(60Hz), the performance is about 40fps
With this patch, it can achieve around 60fps.

Signed-off-by: Wayne Zou <b36644@freescale.com>
---

diff --git a/drivers/mxc/ipu3/ipu_common.c b/drivers/mxc/ipu3/ipu_common.c
index ab54bdb757cb..762aebc20654 100644
--- a/drivers/mxc/ipu3/ipu_common.c
+++ b/drivers/mxc/ipu3/ipu_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2005-2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2005-2013 Freescale Semiconductor, Inc. All Rights Reserved.
  */
 
 /*
@@ -2183,7 +2183,7 @@ int32_t ipu_disable_channel(struct ipu_soc *ipu, ipu_channel_t channel, bool wai
 			(ipu->thrd_chan_en[IPU_CHAN_ID(channel)] &&
 			idma_is_set(ipu, IDMAC_CHA_BUSY, thrd_dma))) {
 			uint32_t irq = 0xffffffff;
-			int timeout = 50;
+			int timeout = 50000;
 
 			if (idma_is_set(ipu, IDMAC_CHA_BUSY, out_dma))
 				irq = out_dma;
@@ -2209,7 +2209,7 @@ int32_t ipu_disable_channel(struct ipu_soc *ipu, ipu_channel_t channel, bool wai
 			while (((ipu_cm_read(ipu, IPUIRQ_2_STATREG(irq))
 				& IPUIRQ_2_MASK(irq)) == 0) &&
 				(idma_is_set(ipu, IDMAC_CHA_BUSY, irq))) {
-				msleep(10);
+				udelay(10);
 				timeout -= 10;
 				if (timeout <= 0) {
 					ipu_dump_registers(ipu);
@@ -2217,6 +2217,7 @@ int32_t ipu_disable_channel(struct ipu_soc *ipu, ipu_channel_t channel, bool wai
 					break;
 				}
 			}
+			dev_dbg(ipu->dev, "wait_time:%d\n", 50000 - timeout);
 
 		}
 	}