[PATCH 5/8] dmaengine: ep93xx: Prepare clock before using it

[Nikita Shubin <nikita.shubin@maquefel.me>]

From: Alexander Sverdlin <alexander.sverdlin@gmail.com>

Use clk_prepare_enable()/clk_disable_unprepare() in preparation for switch
to Common Clock Framework, otherwise the following is visible:

WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:1011 clk_core_enable+0x9c/0xbc
Enabling unprepared m2p0
...
Hardware name: Cirrus Logic EDB9302 Evaluation Board
...
clk_core_enable
clk_core_enable_lock
ep93xx_dma_alloc_chan_resources
dma_chan_get
find_candidate
__dma_request_channel
snd_dmaengine_pcm_request_channel
dmaengine_pcm_new
snd_soc_pcm_component_new
soc_new_pcm
snd_soc_bind_card
edb93xx_probe
...
ep93xx-i2s ep93xx-i2s: Missing dma channel for stream: 0
ep93xx-i2s ep93xx-i2s: ASoC: error at snd_soc_pcm_component_new on ep93xx-i2s: -22
edb93xx-audio edb93xx-audio: ASoC: can't create pcm CS4271 HiFi :-22
edb93xx-audio edb93xx-audio: snd_soc_register_card() failed: -22
edb93xx-audio: probe of edb93xx-audio failed with error -22

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
 drivers/dma/ep93xx_dma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
index 01027779beb8..98f9ee70362e 100644
--- a/drivers/dma/ep93xx_dma.c
+++ b/drivers/dma/ep93xx_dma.c
@@ -897,7 +897,7 @@ static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan)
 	if (data && data->name)
 		name = data->name;
 
-	ret = clk_enable(edmac->clk);
+	ret = clk_prepare_enable(edmac->clk);
 	if (ret)
 		return ret;
 
@@ -936,7 +936,7 @@ static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan)
 fail_free_irq:
 	free_irq(edmac->irq, edmac);
 fail_clk_disable:
-	clk_disable(edmac->clk);
+	clk_disable_unprepare(edmac->clk);
 
 	return ret;
 }
@@ -969,7 +969,7 @@ static void ep93xx_dma_free_chan_resources(struct dma_chan *chan)
 	list_for_each_entry_safe(desc, d, &list, node)
 		kfree(desc);
 
-	clk_disable(edmac->clk);
+	clk_disable_unprepare(edmac->clk);
 	free_irq(edmac->irq, edmac);
 }
 
-- 
2.26.2