[U-Boot] [PATCH] dma: ti: k3-udma: Do not touch RT registers before channel configuration

[Vignesh Raghavendra]

From: Peter Ujfalusi <peter.ujfalusi at ti.com>

Upcoming sysfw (2019.03) will not open the channelized firewalls during
init, it only going to do so in response to the channel configuration
message.

Remove the channel state checks done before the channel configuration and
move it after the configuration for warning purposes.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
---
 drivers/dma/ti/k3-udma.c | 33 +++++++++------------------------
 1 file changed, 9 insertions(+), 24 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index f78a01aa8f8c..f896e2958755 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -575,14 +575,6 @@ static int udma_get_tchan(struct udma_chan *uc)
 
 	pr_debug("chan%d: got tchan%d\n", uc->id, uc->tchan->id);
 
-	if (udma_is_chan_running(uc)) {
-		dev_warn(ud->dev, "chan%d: tchan%d is running!\n", uc->id,
-			 uc->tchan->id);
-		udma_stop(uc);
-		if (udma_is_chan_running(uc))
-			dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
-	}
-
 	return 0;
 }
 
@@ -602,14 +594,6 @@ static int udma_get_rchan(struct udma_chan *uc)
 
 	pr_debug("chan%d: got rchan%d\n", uc->id, uc->rchan->id);
 
-	if (udma_is_chan_running(uc)) {
-		dev_warn(ud->dev, "chan%d: rchan%d is running!\n", uc->id,
-			 uc->rchan->id);
-		udma_stop(uc);
-		if (udma_is_chan_running(uc))
-			dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
-	}
-
 	return 0;
 }
 
@@ -652,14 +636,6 @@ static int udma_get_chan_pair(struct udma_chan *uc)
 
 	pr_debug("chan%d: got t/rchan%d pair\n", uc->id, chan_id);
 
-	if (udma_is_chan_running(uc)) {
-		dev_warn(ud->dev, "chan%d: t/rchan%d pair is running!\n",
-			 uc->id, chan_id);
-		udma_stop(uc);
-		if (udma_is_chan_running(uc))
-			dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
-	}
-
 	return 0;
 }
 
@@ -1071,6 +1047,15 @@ static int udma_alloc_chan_resources(struct udma_chan *uc)
 		}
 	}
 
+	if (udma_is_chan_running(uc)) {
+		dev_warn(ud->dev, "chan%d: is running!\n", uc->id);
+		udma_stop(uc);
+		if (udma_is_chan_running(uc)) {
+			dev_err(ud->dev, "chan%d: won't stop!\n", uc->id);
+			goto err_free_res;
+		}
+	}
+
 	/* PSI-L pairing */
 	ret = udma_navss_psil_pair(ud, uc->src_thread, uc->dst_thread);
 	if (ret) {
-- 
2.21.0