linux-kernel - [PATCH v2 6/8] imx-drm: imx-dp: When disabling the DP foreground channel, wait until the DP background channel is finished before disabling the IDMAC channel

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Date:	Mon, 14 Apr 2014 23:53:21 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	devel@...verdev.osuosl.org,
	Russell King <rmk+kernel@....linux.org.uk>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v2 6/8] imx-drm: imx-dp: When disabling the DP foreground channel, wait until the DP background channel is finished before disabling the IDMAC channel

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/staging/imx-drm/ipu-v3/ipu-dp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
index 6980fa1..d90f82a 100644
--- a/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
+++ b/drivers/staging/imx-drm/ipu-v3/ipu-dp.c
@@ -277,6 +277,9 @@ void ipu_dp_disable_channel(struct ipu_dp *dp)
 	writel(0, flow->base + DP_FG_POS);
 	ipu_srm_dp_sync_update(priv->ipu);
 
+	if (ipu_idmac_channel_busy(priv->ipu, IPUV3_CHANNEL_MEM_BG_SYNC))
+		ipu_wait_interrupt(priv->ipu, IPU_IRQ_DP_SF_END, 50);
+
 	mutex_unlock(&priv->mutex);
 }
 EXPORT_SYMBOL_GPL(ipu_dp_disable_channel);
-- 
1.9.1

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