linux-kernel - [PATCH] dmaengine: ti: omap-dma: Configure LCH

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Date:   Mon, 19 Nov 2018 12:40:40 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>, <dan.j.williams@...el.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <aaro.koskinen@....fi>, <tony@...mide.com>,
        <linux-omap@...r.kernel.org>, <rmk+kernel@...linux.org.uk>
Subject: [PATCH] dmaengine: ti: omap-dma: Configure LCH_TYPE for OMAP1

When the channel is configured for slave operation the LCH_TYPE needs to be
set to LCh-P. For memcpy channels the LCH_TYPE must be set to LCh-2D.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/ti/omap-dma.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c
index a4a931ddf6f6..a18cfd497f04 100644
--- a/drivers/dma/ti/omap-dma.c
+++ b/drivers/dma/ti/omap-dma.c
@@ -185,6 +185,10 @@ enum {
 
 	CLNK_CTRL_ENABLE_LNK	= BIT(15),
 
+	/* OMAP1 only */
+	LCH_CTRL_LCH_2D		= 0,
+	LCH_CTRL_LCH_P		= 2,
+
 	CDP_DST_VALID_INC	= 0 << 0,
 	CDP_DST_VALID_RELOAD	= 1 << 0,
 	CDP_DST_VALID_REUSE	= 2 << 0,
@@ -529,6 +533,7 @@ static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d)
 
 static void omap_dma_start_desc(struct omap_chan *c)
 {
+	struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 	struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 	struct omap_desc *d;
 	unsigned cxsa, cxei, cxfi;
@@ -570,6 +575,12 @@ static void omap_dma_start_desc(struct omap_chan *c)
 	omap_dma_chan_write(c, CSDP, d->csdp);
 	omap_dma_chan_write(c, CLNK_CTRL, d->clnk_ctrl);
 
+	if (dma_omap1() && !__dma_omap15xx(od->plat->dma_attr)) {
+		if (is_slave_direction(d->dir))
+			omap_dma_chan_write(c, LCH_CTRL, LCH_CTRL_LCH_P);
+		else
+			omap_dma_chan_write(c, LCH_CTRL, LCH_CTRL_LCH_2D);
+	}
 	omap_dma_start_sg(c, d);
 }
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki