linux-kernel - [PATCH 01/16] dmaengine: ste_dma40: reset priority bit for logical channels

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Date:	Mon,  7 Jan 2013 12:21:43 +0100
From:	Fabio Baltieri <fabio.baltieri@...aro.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <djbw@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Narayanan <narayanan.gopalakrishnan@...ricsson.com>,
	Fabio Baltieri <fabio.baltieri@...aro.org>
Subject: [PATCH 01/16] dmaengine: ste_dma40: reset priority bit for logical channels

From: Narayanan <narayanan.gopalakrishnan@...ricsson.com>

This patch sets the SSCFG/SDCFG bit[7] PRI only for physical channel
requests with high priority.  For logical channels, this bit will be
zero.

Signed-off-by: Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
Reviewed-by: Rabin Vincent <rabin.vincent@...ricsson.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@...aro.org>
---
 drivers/dma/ste_dma40_ll.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/ste_dma40_ll.c b/drivers/dma/ste_dma40_ll.c
index 851ad56..d64b72a 100644
--- a/drivers/dma/ste_dma40_ll.c
+++ b/drivers/dma/ste_dma40_ll.c
@@ -102,17 +102,18 @@ void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
 		src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
 		dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
 
+		/* Set the priority bit to high for the physical channel */
+		if (cfg->high_priority) {
+			src |= 1 << D40_SREG_CFG_PRI_POS;
+			dst |= 1 << D40_SREG_CFG_PRI_POS;
+		}
+
 	} else {
 		/* Logical channel */
 		dst |= 1 << D40_SREG_CFG_LOG_GIM_POS;
 		src |= 1 << D40_SREG_CFG_LOG_GIM_POS;
 	}
 
-	if (cfg->high_priority) {
-		src |= 1 << D40_SREG_CFG_PRI_POS;
-		dst |= 1 << D40_SREG_CFG_PRI_POS;
-	}
-
 	if (cfg->src_info.big_endian)
 		src |= 1 << D40_SREG_CFG_LBE_POS;
 	if (cfg->dst_info.big_endian)
-- 
1.7.12.1

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