linux-kernel - [PATCH v2] dma: rcar-dmac: clear pertinence number of channels

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Date:	Thu, 3 Mar 2016 17:25:53 +0900
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Robin Murphy <robin.murphy@....com>,
	Vinod Koul <vinod.koul@...el.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Arnd Bergmann <arnd@...db.de>
CC:	<linux-renesas-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: [PATCH v2] dma: rcar-dmac: clear pertinence number of channels

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

DMACHCLR clears each channels, but its channel number is based on
its SoC or IP. Current driver is using fixed 0x7fff (= for 15ch),
it is not good match for Gen3 or Gen2 Audio DMAC. This patch fixes it

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v1 -> v2

 - 14ch -> 15ch

 drivers/dma/sh/rcar-dmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 57a6dfc9..02b86c6 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -422,7 +422,7 @@ static int rcar_dmac_init(struct rcar_dmac *dmac)
 	u16 dmaor;
 
 	/* Clear all channels and enable the DMAC globally. */
-	rcar_dmac_write(dmac, RCAR_DMACHCLR, 0x7fff);
+	rcar_dmac_write(dmac, RCAR_DMACHCLR, GENMASK(dmac->n_channels - 1, 0));
 	rcar_dmac_write(dmac, RCAR_DMAOR,
 			RCAR_DMAOR_PRI_FIXED | RCAR_DMAOR_DME);
 
-- 
1.9.1